Bolthole Index

Mendocino County, California

Building permits, zoning and septic rules in Mendocino County, California

56Index Score / 100
#3 of 58 in California

Unincorporated Mendocino County, California requires building permits, including for dwellings and appurtenant structures covered by its limited-density rural rules12. Zoning rules differ among inland land, the Coastal Zone and the unincorporated Town of Mendocino3. County Environmental Health requires a site evaluation report for a new septic permit and an inspection before final approval456.

At a glance

Building permit
Required; the limited-density rural code expressly covers dwellings and appurtenant structures12
Zoning
Rules vary among inland land, the Coastal Zone and the unincorporated Town of Mendocino37
Septic permit
County Environmental Health requires a site evaluation report and inspection before final approval85910
Owner-builder
Class K is an alternative permit path for qualifying owner-occupied rural dwellings, not a permit exemption11
Tiny home
Moveable tiny homes are allowed inland where residential dwellings or accessory uses are allowed, subject to detailed standards12
Well permit
A county permit is required before constructing a new well13
Floodplain
Construction or development in a special flood-hazard area requires a permit before work begins14

Who to call

Building permits

Mendocino County Building Division (Planning & Building Services)

Building permits, plan checks and inspections in unincorporated Mendocino County; the phone shown is the Ukiah automated inspection request line

(707) 234 6650

501 Low Gap Road, Ukiah, CA 95482

Online permits →

Zoning

Mendocino County Planning & Building Services

County zoning ordinances for inland areas, the coastal zone and the Town of Mendocino

501 Low Gap Road, Ukiah, CA 95482

Septic permits

Mendocino County Environmental Health Division, Land Use Program

Onsite wastewater and water-well land-use services

(707) 234-6625

enviroh@mendocinocounty.gov

860 N. Bush Street Ukiah, CA 95482

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

Going off-grid in Mendocino County means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Mendocino County, California?

California requires a building permit from the local building official before covered construction, alteration, repair, movement, conversion, removal or demolition2. Mendocino County's limited-density rural chapter requires building permits for dwellings and appurtenant structures on legal parcels of at least 1 acre in unincorporated areas zoned for minimums of 1 acre or larger; applications require health-agency approval of sewage disposal, and these building permits are valid for 3 years, with extensions possible1.

Mendocino County's Class K route is an alternative building-permit path for owner-occupied rural dwellings, with a 2.5-story limit and state fire-safety requirements11. The owner-built definition requires a principal residence, excludes housing intended for sale, lease, rent or employee occupancy, and allows a licensed contractor to build for the owner's occupancy15. Mendocino County adopted the 2025 California Building Standards Code and related codes with local amendments under Title 1816.

Who is the Mendocino County building department, and how do you reach it?

The Mendocino County Building Division administers and enforces construction rules in unincorporated Mendocino County and performs plan checks and inspections17. Applications may be submitted at the Ukiah or Fort Bragg office or through eTRAKiT by an owner-builder, a California-licensed and bonded contractor, or an authorized agent17.

For plan-reviewed work, submit the application, plans, site map and initial payment; county and outside-agency reviews may follow, corrections may require resubmittal, remaining fees are due before issuance, and a final inspection is required after construction18. Inside Ukiah, the city handles building permits19. Fort Bragg has its own building-permit requirements20. County Environmental Health remains the septic authority under its Local Agency Management Plan8. The Ukiah automated inspection line is (707) 234 665017. Building permit fees follow the valuation framework in Title 18, so ask the Building Division for a project-specific fee calculation because current permit amounts could not be confirmed21.

Does Mendocino County have zoning?

Mendocino County has zoning for unincorporated land, with district-specific requirements7. Inland, Coastal Zone and Town of Mendocino rules differ; Division III supersedes the county's general zoning regulations within the unincorporated Town of Mendocino while preserving other applicable laws322. Fort Bragg sets its own inland and coastal zoning; County Environmental Health remains the septic authority238. The county publishes inland, coastal and Town divisions, but the available material does not provide one complete district list or map2425.

Inland minimum lot area is district-specific. Rural Residential designations range from 40,000 or 80,000 square feet to 5 or 10 acres, while Upland Residential designations require 20 or 40 acres2627. In the S-R district, minimums range from 4,000 or 6,000 square feet for specified uses with both water and sewer to 40,000 square feet outside a water or sewer district28. Inland setbacks and height limits vary by district and structure type2930. Ask Planning for the parcel's current district, overlays and coastal standards.

How do septic permits work in Mendocino County?

Mendocino County Environmental Health administers septic regulation under its Local Agency Management Plan; larger-flow, high-strength wastewater and some park projects may fall under North Coast Regional Water Quality Control Board jurisdiction8. New systems need a site evaluation report, plan review, an installation permit and construction inspections; repairs or replacements of failing systems also require a county septic permit59. A new-system septic permit lasts 2 years unless renewed while current5. Environmental Health or a qualified site evaluator must inspect before final approval; nonstandard systems require ongoing operating permits and inspections, so ask Environmental Health which schedule applies10.

Only 0.9% of mapped county soils lack severe limitations for a conventional drain field, making early site evaluation especially useful31. Mendocino County requires public-sewer connection when the nearest proposed building is no more than 200 feet from a public sewer; parcels in designated sewer service areas need a district waiver before an onsite wastewater permit can issue32. Environmental Health's floor-area bedroom table sizes septic systems; it is not a general minimum-house-size rule33.

Can you live in an RV or tiny home on your land in Mendocino County?

Mendocino County allows a moveable tiny home as a single-family dwelling, accessory dwelling unit or second residential unit in inland unincorporated districts that allow residential dwellings or accessory uses12. The unit must satisfy the county's size, design, parking, setback, utility, inspection, certification and registration standards and connect to approved water and waste-disposal systems12. That inland chapter does not apply to recreational vehicles or travel trailers12.

For recreational vehicles, county zoning allows temporary camping on private land only in the R-R, U-R, A-G, R-L, F-L and T-P zoning districts, for no more than 60 days in any six-month period, and an Administrative Permit is required unless a short-stay exclusion applies34. The rule limits a site to 30 people or 10 tents or recreational vehicles at one time, and the vehicles may not be blocked up, placed on a permanent foundation or connected to water, gas or electricity34. The county camping rule does not authorize permanent RV occupancy34. We could not confirm year-round RV living; ask County Planning before relying on an RV while building. Mendocino County prohibits surface discharge of sanitary wastewater and generally prohibits new cesspools, seepage pits, pit privies and holding tanks, so an off-grid sanitation plan needs Environmental Health review35.

Building a home in Mendocino County: the steps, in order

  1. Ask Planning to identify whether inland, Coastal Zone or Town of Mendocino rules govern the parcel and to confirm its district and overlays3.
  2. Confirm allowed use, minimum lot area, setbacks and height under the applicable district rules262930.
  3. Arrange the site evaluation and septic permit; if the parcel is in a designated sewer service area, obtain the district waiver required before an onsite permit can issue532.
  4. Confirm legal access and obtain a development permit before work in an unincorporated special flood-hazard area36.
  5. Submit the building application, plans, site map and initial payment, then respond to agency corrections18.
  6. Request Class K inspections at least 48 hours ahead; new buildings normally require foundation, rough-in and final inspections, subject to enforcement-agency waivers under the rural chapter37.
  7. After a limited-density rural dwelling is complete and required inspections are approved, obtain the certificate of occupancy38. Temporary occupancy before full completion requires approved sanitation and incomplete work that does not endanger life, health or safety38.

What should you check before buying land in Mendocino County?

Check wastewater, water, access and flood exposure before treating a parcel as buildable. Only 0.9% of mapped soils lack severe limitations for a conventional drain field, and 27.4% of county land has a slope of 15% or less3139. A county permit is required before constructing a new well13. Construction, destruction, repair or alteration of monitoring, cathodic or remediation wells and borings requires an Environmental Health permit before work and completion logs within 15 days; known contaminated sites need regional water-board work-plan approval, and Coastal Zone sites need a Coastal Zone Permit before field work40.

Development in an unincorporated special flood-hazard area requires a permit before work begins36. New homes and substantial improvements there must use flood-resistant construction, resist flotation and lateral movement, and meet zone-specific lowest-floor elevation rules41. A common driveway is required where the C Cluster Combining District provisions apply, but that is not a countywide driveway rule42. Discuss subdivision feasibility with Planning before pricing a parcel on the assumption that it can be split43.

Watch-outs

  • Mendocino County uses different zoning divisions for inland land, the Coastal Zone and specified unincorporated areas of the Town of Mendocino; confirm the parcel's division before relying on an inland standard3.
  • Inland short-term rentals operate under the county's Room and Board interpretation, and a parcel without frontage on a publicly maintained road requires a Major Use Permit4445.
  • A moveable tiny home must connect to approved water and waste disposal, and the inland tiny-home chapter does not cover recreational vehicles or travel trailers12.
  • Mendocino County limits RV camping to the R-R, U-R, A-G, R-L, F-L and T-P districts and 60 days in any six-month period; the Administrative Permit exclusion is limited to 14 days and no more than 10 combined tents, RVs, trailer coaches and vehicles34.

Sources

  1. Mendocino County Code, Supplement No. 52, Title 18, Chapter 18.23, quoted and re-checked
  2. Do I need a building permit for my project? (California statewide rule), quoted and re-checked
  3. Planning Division | Mendocino County, CA, quoted and re-checked
  4. Mendocino County Local Area Management Plan, quoted and re-checked
  5. Mendocino County Onsite Wastewater Treatment Systems Technical Document, quoted and re-checked
  6. Mendocino County Local Area Management Plan, quoted and re-checked
  7. Mendocino County Code § 20.072.025 — R-1 Single-Family Residential District, quoted and re-checked
  8. County of Mendocino Local Agency Management Plan (LAMP), quoted and re-checked
  9. County of Mendocino Local Agency Management Plan (LAMP), quoted and re-checked
  10. County of Mendocino Local Agency Management Plan (LAMP), quoted and re-checked
  11. 2024-25 Mendocino County Civil Grand Jury, quoted and re-checked
  12. Planning Commission Resolution PC_2024-___ — Inland Zoning Code Update, quoted and re-checked
  13. Final Environmental Impact Report for the Licensing of Commercial Cannabis Cultivation in Mendocino County Project, quoted and re-checked
  14. Mendocino County Code of Ordinances, quoted and re-checked
  15. Mendocino County Code, Title 18, Chapter 18.23, quoted and re-checked
  16. Ordinance No. 4553—2025 California Building Standards Code Adoption, quoted and re-checked
  17. Mendocino County Building Division (Planning & Building Services) (mendocinocounty.gov)
  18. Building Division – Plan Review Required Public Facing Procedure, quoted and re-checked
  19. Ukiah: Building Services (Mendocino County), quoted and re-checked
  20. Fort Bragg: Chapter 15.04 Construction Codes – Adopted By Reference (Mendocino County), quoted and re-checked
  21. Mendocino County Code § 18.08.040 — Valuation, quoted and re-checked
  22. Mendocino Town Zoning Code—Division III, quoted and re-checked
  23. Fort Bragg: Fort Bragg Municipal Code (Mendocino County), quoted and re-checked
  24. Short Term Rentals policy clarification memorandum, quoted and re-checked
  25. Mendocino County Planning & Building Services (mendocinocounty.gov)
  26. Attachment 2, Exhibit A — Mendocino County Inland Zoning Code Update, quoted and re-checked
  27. Attachment 2, Exhibit A — Mendocino County Inland Zoning Code Update, quoted and re-checked
  28. Attachment 2, Exhibit A — Mendocino County Inland Zoning Code Update, quoted and re-checked
  29. Mendocino County Zoning Code—Division I, quoted and re-checked
  30. Mendocino County Zoning Code—Division I, quoted and re-checked
  31. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  32. County of Mendocino Local Agency Management Plan (LAMP), quoted and re-checked
  33. Bedroom Definition, Policy 4200.04, quoted and re-checked
  34. Mendocino County Code § 20.168.035 — Camping, quoted and re-checked
  35. County of Mendocino Local Agency Management Plan (LAMP), quoted and re-checked
  36. Mendocino County Code, Supplement No. 49, Chapter 22.17 Floodplain Ordinance, quoted and re-checked
  37. Mendocino County Code, Supplement No. 52, quoted and re-checked
  38. Mendocino County Code, Supplement No. 52, Title 18, Chapter 18.23, quoted and re-checked
  39. Share of land at 15% slope or less: Bolthole Index county data
  40. Monitoring Well Application, quoted and re-checked
  41. Mendocino County Code, Supplement No. 49, Chapter 22.17 Floodplain Ordinance, quoted and re-checked
  42. mendocinocounty.gov, quoted and re-checked
  43. Minor Subdivision Application, quoted and re-checked
  44. Short Term Rentals policy clarification memorandum, quoted and re-checked
  45. Short Term Rentals policy clarification memorandum, quoted and re-checked

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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Compared with neighboring counties

Like all 6 of its neighbors, Mendocino County has countywide zoning.

RuleMendocino CountyLake CountyGlenn CountySonoma CountyColusa CountyTehama CountyNapa County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredLimited
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Env. Health Div.County Health Services Dept.County Env. HealthPermit SonomaCounty Env. Health Div.County Env. Health Dept.County Env. Health Div.

County locator

Mendocino County in California

56
County map
Mendocino County highlighted among the California counties · colored by Index score

How Mendocino County scores

Seclusion69100% ev.
Self-Sufficiency57100% ev.
Admin Boringness41100% ev.
Durability28100% ev.
Property Autonomy56100% ev.
Carry Cost61100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$504kTypical home
0.7%Property tax
$6,511Land / acre
51.9"Annual rain
34.2% of yrsSevere drought
4.1 / yr (+2.5)Mid-century 100°F days
63.8 daysMid-century dry spell
3.2" (+5.3%)Mid-century 1-day rain
1.09×Wildfire change factor
100%Forward climate coverage
$2,475Home insurance / yr
10.3% / yrInsurance growth
2.75%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
12,223Radius comparison (15 mi)
25.4People / sq mi
15%Federal land
27.4%Land at 15% slope or less
0.9%Soils rated "not limited" for septic (strict USDA rating)
15,562 acWorkable land screen
86.5%Wooded land
100.8 tonsBiomass / forest ac
55.7°FAvg temp

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Cities and towns in Mendocino County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Willits

Answers from the rulebook for Mendocino County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Mendocino County rules

  • Building permitRequired

    Construction of rural dwellings and appurtenant structures governed by Mendocino County Code Chapter 18.23 in unincorporated areas.

    • The chapter applies to limited density owner-built rural dwellings and appurtenant structures, including seasonally or permanently occupied dwellings, hunting shelters, guest cottages, vacation homes, recreational shelters, and detached bedrooms in rural areas.
    • The code states that rural areas are unincorporated areas designated and zoned for one-acre minimums or larger, and the legal parcel must be at least one acre.
    • Permit applications require, among other items, approval for a private sewage disposal system or alternate waste disposal means from the local health enforcement agency.
    • Permits are valid for three years; extensions may be granted under the standards applicable to building-permit extensions.

    minimum rural parcel size: >= 1 acre · permit validity: 3 years (Extensions may be granted under the standards applicable to building-permit extensions.)

    “Permits shall be required for the construction of rural dwellings and appurtenant structures. (Ord. No. 3343, adopted 1981.)”
    One more reviewed finding on this topic
    • Required — Construction of limited density owner-built rural dwellings and appurtenant structures in unincorporated Mendocino County.
      “Permits shall be required for the construction of rural dwellings and appurtenant structures.”
  • Owner-builder exemptionConditional

    Owner-built rural dwellings using Mendocino County's Class K limited-density rural dwelling permit pathway.

    • Class K is an alternative permit pathway, not an exemption from the underlying building-permit requirement.
    • The dwelling must be inhabited by the owner/builder.
    • The structure cannot be commercial, industrial, or uninhabited.
    • The lot must be one acre or larger.
    • The structure cannot exceed two and one-half stories.
    • State fire-safety regulations apply.
    • The source describes Class K as allowing unconventional means and materials instead of relying on licensed contractors.

    minimum lot size: >= 1 acre · maximum stories: <= 2.5 stories · permit pathway: Class K limited-density rural dwelling permit

    “the dwelling must be inhabited by the owner/builder, be constructed on a one-acre or larger lot”
    One more reviewed finding on this topic
    • Available (with conditions) — Owner-built rural dwellings governed by Mendocino County Code Chapter 18.23.
      “"Owner-Built" shall mean constructed by any person or family who acts as the general contractor for or the provider of, part or all of the labor necessary to build housing to be occupied as the principal residence of that person or family, and not intended for sale, lease, or rent or employee occupancy.”
  • Building code adoptedAdopted (with conditions)

    2025 California Building Standards Code and listed related codes adopted by Mendocino County for construction regulated under County Code Title 18.

    • The codes are adopted subject to applicable sections of Mendocino County Code Title 18.
    • The adoption is by reference with local amendments, selected provisions, chapters, and appendices.
    • The California Building Code includes Appendices C, G, H, and I, subject to Title 18 modifications.
    • The California Residential Code includes Appendices BB, BF, BG, BI, BJ, BO, and CI, subject to Title 18 modifications.
    • Permit applications are generally abandoned after one year unless pursued in good faith; written extensions require justifiable cause and may be granted for periods of no more than 180 days, with a fee established by the Board of Supervisors.
    • Permits generally become invalid if work does not commence within one year and required inspection approvals are not obtained annually, subject to stated exceptions and extensions.
    • Ordinance No. 4553 was passed and adopted on November 18, 2025.

    code edition: 2025 (Subject to local amendments and applicable Title 18 provisions) · permit-application abandonment period: 1 year (Unless pursued in good faith or extended by the Building Official) · permit extension period: <= 180 days (Written request, justifiable cause, and Board-established fee required)

    “the following primary and secondary codes are hereby adopted [...] CALIFORNIA BUILDING CODE, 2025 Edition, Part 2, Volumes I and II”
  • InspectionsLimited

    Construction or work requiring a permit for limited density rural dwellings and appurtenant structures in unincorporated Mendocino County rural areas. The County defines rural areas for this chapter as unincorporated areas designated and zoned for one-acre minimums or larger, with the legal parcel no less than one acre.

    • A permit is required for construction of rural dwellings and appurtenant structures.
    • All permitted construction or work is subject to inspection by the designated enforcement agency.
    • For all new buildings or structures, a minimum of three inspections is required: foundation before concrete placement; rough-in before closing walls to inspect electrical, mechanical, plumbing, and framing; and final inspection after completion and readiness for occupancy.
    • The enforcement agency may waive inspections for structures without electrical or mechanical installations; for alterations, additions, modifications, or repairs not involving electrical or mechanical installations; or when the applicant stipulates in writing that the work complies with the permit application and Chapter 18.23.
    • The applicant must notify the enforcement agency that construction is ready, provide access, and request inspections at least 48 hours before the intended inspection.
    • Additional inspections may be conducted for unstable soil conditions, concealed construction or systems, or unconventional construction methods that would preclude examination at a single inspection.
    • Inspection fees are established by Board of Supervisors resolution to reflect actual inspection and administrative costs.

    minimum required inspections for new buildings or structures: >= 3 inspections (Subject to the inspection-waiver provisions in Section 18.23.180.) · advance inspection notice: >= 48 hours · minimum rural parcel size: >= 1 acre

    “All construction or work for which a permit is required shall be subject to inspection”
    One more reviewed finding on this topic
    • Required — New Class K buildings or structures in rural, unincorporated Mendocino County subject to Mendocino County Code Chapter 18.23.
      “A minimum of three (3) inspections shall be required for all new buildings or structures at the following stages of construction:”
  • Certificate of occupancyLimited

    Limited density rural dwellings and appurtenant structures governed by Mendocino County Code Chapter 18.23 in unincorporated Mendocino County rural areas.

    • After the structure is completed for occupancy, all inspections required by the enforcing agency have been conducted, and the work is approved, the enforcement agency shall issue a Certificate of Occupancy for compliant dwellings and appurtenant structures.
    • Use and occupancy of a portion of a dwelling or appurtenant structure before the entire structure is completed is allowed if approved sanitary facilities are available at the site and the completed work does not create a condition endangering the life, health, or safety of the public or occupants.
    • Occupants of an uncompleted structure or portion assume sole responsibility for that occupancy.
    • The certificate requirement applies to structures complying with Chapter 18.23 and follows completion and approval of required inspections.
    “the enforcement agency shall issue a Certificate of Occupancy”
    One more reviewed finding on this topic
    • Required — Rural dwellings and appurtenant structures governed by Mendocino County Code Chapter 18.23 after completion and approval of required inspections.
      “After the structure(s) is completed for occupancy and all inspections which have been required by the enforcing agency have been conducted, and work approved, the enforcement agency shall issue a Certificate of Occupancy for such dwelling(s) and appurtenant structure(s) which comply with the provisions of this Chapter.”
  • County-wide zoningPresent (with conditions)

    County zoning ordinance regulating land uses and development in unincorporated Mendocino County.

    • Requirements vary by zoning district.
    • The cited district standards vary based on water and sewer district status.
    • Coastal zoning rules may apply in the coastal zone.
    “For parcels not in a water or sewer district: forty thousand (40,000) square feet.”
  • Local zoningVaries (with conditions)

    Countywide aggregate of local zoning coverage: County Title 20 zoning varies by geographic area, including inland unincorporated areas, the Coastal Zone, and the Town of Mendocino.

    • Division I regulates inland areas outside the Coastal Zone and Town of Mendocino.
    • Division II regulates applicable unincorporated Coastal Zone areas.
    • Division III regulates specified unincorporated areas of the Town of Mendocino.
    • This is an aggregate countywide claim and does not assert that the County administers zoning ordinances adopted independently by incorporated municipalities.
    “In Mendocino County there are two adopted Categorical Exclusion Orders (and associated amendments), one for Division II (Coastal Zone, excluding Town of Mendocino) and one for Division III (Town of Mendocino).”
    One more reviewed finding on this topic
    • Varies (with conditions) — Countywide aggregate: zoning regimes differ by geographic area within Mendocino County, including inland unincorporated areas, the Coastal Zone, and the unincorporated Town of Mendocino.
      “These regulations supersede the County of Mendocino zoning regulations, [...] for land which lies within the [...] unincorporated area of the Town of Mendocino.”
  • Zoning districtsPublished (with conditions)

    The County's published zoning code includes the C Cluster Combining District and its standards for applicable unincorporated properties.

    • The cited provision applies specifically to the C Cluster Combining District and does not by itself enumerate every county zoning district.
    • The source is an official County Code publication; current amendments after the retrieved code supplement were not independently verified.

    minimum parcel size contiguous to Type I Agricultural Preserves: >= 5 acres (A higher density may be allowed to recognize the average density of existing parcel sizes within one-quarter mile.) · minimum parcel size contiguous to Type II Agricultural Preserves or Timberland Production zoning: >= 10 acres (A higher density may be allowed to recognize the average density of existing parcel sizes within one-quarter mile.)

    “CHAPTER 20.116 "C" CLUSTER COMBINING DISTRICT”
    One more reviewed finding on this topic
    • Partial — Publication of county zoning-code divisions and district-based land-use controls for unincorporated Mendocino County.
      “Mendocino County’s inland zoning ordinance (Division I) does not contain specific regulations addressing short- term rentals (STRs). [...] Mendocino County’s coastal zoning ordinance (Division II) Coastal Zone: Vacation home rentals are permitted (with a Business License) in all zoning’s that allow a single-family residence. Mendocino County’s Town of Mendocino ordinance (Division III) Coastal Zone: This division has a waiting list for Short Term Rentals.”
  • Minimum dwelling sizeSpecified

    Dwelling gross floor area as used by the Mendocino County Division of Environmental Health to size on-site sewage systems; this is a wastewater-sizing rule based on minimum bedroom count, not a general county minimum floor-area rule for all dwellings.

    • The policy applies for purposes of sizing on-site sewage systems.
    • Any room designated by the applicant as a bedroom, and certain other rooms such as sewing rooms, dens, offices, studios, lofts, and game rooms, may be considered bedrooms.
    • A room with a large 6–8 feet opening without a door into an entryway or main activity area, a half wall or railing along at least one side, or 70 square feet or less may not be considered by the Health Officer to constitute a bedroom.
    • The policy states an effective date of July 1, 2016 and a revised date of January 20, 2016.

    minimum bedrooms for gross floor area 0–1500: >= 1 bedrooms (For purposes of sizing on-site sewage systems.) · minimum bedrooms for gross floor area 1501–2100: >= 2 bedrooms (For purposes of sizing on-site sewage systems.) · minimum bedrooms for gross floor area 2101–3000: >= 3 bedrooms (For purposes of sizing on-site sewage systems.) · minimum bedrooms for gross floor area over 3001: >= 4 bedrooms (For purposes of sizing on-site sewage systems.)

    “Notwithstanding the above provisions, the minimum number of bedrooms for any dwelling shall be no less than the following: Gross Floor Area No. of Bedrooms 0 – 1500 SF 1 1501 – 2100 SF 2 2101 – 3000 SF 3 Over 3001 SF 4”
  • Minimum lot sizeDistrict specific (with conditions)

    Parcels in the R-R Rural Residential District under Mendocino County Code Chapter 20.048.

    • R-R:L-1 requires 40,000 square feet.
    • R-R:L-2 requires 80,000 square feet.
    • R-R:L-5 requires 5 acres.
    • R-R:L-10 requires 10 acres.

    R-R:L-1 minimum lot area: 40000 square feet · R-R:L-2 minimum lot area: 80000 square feet · R-R:L-5 minimum lot area: 5 acres · R-R:L-10 minimum lot area: 10 acres

    “Sec. 20.048.025 Minimum Lot Area. (A) R-R:L-1: forty thousand (40,000) square feet; (B) R-R:L-2: eighty thousand (80,000) square feet; (C) R-R:L-5: five (5) acres; (D) R-R:L-10: ten (10) acres.”
    2 more reviewed findings on this topic
    • District specific (with conditions) — Parcels in the S-R Suburban Residential District under Mendocino County Code Chapter 20.044.
      “Sec. 20.044.025 Minimum Lot Area. (A) For parcels within water and sewer districts: Mobile home and manufactured home subdivisions: 4,000 square feet; Single-family residential or other uses: 6,000 square feet. (B) For parcels within water or sewer districts: 12,000 square feet. (C) For parcels not in a water or sewer district: 40,000 square feet.”
    • District specific (with conditions) — Parcels in the U-R Upland Residential District under Mendocino County Code Chapter 20.056.
      “Sec. 20.056.025 Minimum Lot Area. (A) U-R:L-20: twenty (20) acres. (B) U-R:L-40: forty (40) acres.”
  • SetbacksDistrict specific (with conditions)

    Structures and buildings in unincorporated Mendocino County Inland Zoning Code districts.

    • Setbacks vary by zoning district and structure type.
    • Additional setback exceptions are provided in Section 20.152.015.
    • Nonconforming parcels and parcels adjoining different zoning districts may have different requirements.

    R-R:L-1 and R-R:L-2 front and rear yards: 20 ft (See setback exceptions in Section 20.048.045) · R-R:L-5 front and rear yards: 30 ft (See setback exceptions in Section 20.048.045) · R-R:L-10 front and rear yards: 50 ft (See setback exceptions in Section 20.048.045) · R-R:L-1 and R-R:L-2 side yards: 6 ft (See setback exceptions in Section 20.048.045) · A-G front and rear yards: 50 ft (Nonconforming parcels under five acres observe 20-foot front, side, and rear yards) · A-G side yards: 50 ft (Nonconforming parcels under five acres observe 20-foot front, side, and rear yards) · R-1 front and rear yards: 20 ft (See setback exceptions in Section 20.152.015) · R-1 side yards: 6 ft (See setback exceptions in Section 20.152.015)

    “Sec. 20.048.035 Minimum Front and Rear Yards. (A) R-R:L-1; RR:L-2: twenty (20) feet each; See setback exceptions in section 20.048.045. (B) R-R:L-5: thirty (30) feet each; See setback exceptions in section 20.048.045. (C) R-R:L-10: fifty (50) feet each. See setback exceptions in section 20.048.045.”
  • Building heightDistrict specific (with conditions)

    Buildings and structures in unincorporated Mendocino County Inland Zoning Code districts.

    • Height limits vary by zoning district.
    • Section 20.152.025 provides height exceptions.
    • The cited Division I applies to unincorporated areas exclusive of the Coastal Zone.

    R-R district building height limit: 35 ft (See height exceptions in Section 20.152.025) · A-G district building height limit: 50 ft (See height exceptions in Section 20.152.025) · R-1 district building height limit: 35 ft (See height exceptions in Section 20.152.025) · R-3 district building height limit: 50 ft (See height exceptions in Section 20.152.025)

    “Sec. 20.048.050 Building Height Limit. Thirty-five (35) feet. See height exceptions in section 20.152.025. [...] Sec. 20.052.055 050 Building Height Limit. Fifty (50) feet. See height exceptions in section 20.152.025.”
  • Living in an RVLimited

    Temporary camping involving recreational vehicles on private real property in the county zoning area.

    • Allowed only in the R-R, U-R, A-G, R-L, F-L and T-P zoning districts.
    • Maximum 60 days in any six-month period.
    • An Administrative Permit is required beyond the subsection (E) exclusions.
    • No more than 30 individuals or 10 tents or recreational vehicles may be on site at one time.
    • Vehicles or tents may not be blocked up, placed on a permanent foundation, or connected to water, gas, or electricity.
    • Unused tents or recreational vehicles must be removed.
    • The exclusion requires no more than 10 combined tents, recreational vehicles, trailer coaches, and/or vehicles and no more than 14 days in a six-month period.

    maximum duration: 60 days in any six-month period (Subject to subsection (E) exclusion.) · maximum individuals: <= 30 individuals per site · maximum tents or recreational vehicles: <= 10 items per site · exclusion duration: <= 14 days in any six-month period (Also limited to the subsection (E)(1) item limit.)

    “The maximum time limit for temporary camping shall not exceed sixty (60) days in any six-month period.”
  • Tiny homesAllowed (with conditions)

    Moveable tiny homes used as a single-family dwelling, accessory dwelling unit, or second residential unit in inland unincorporated Mendocino County.

    • The zoning district must allow residential dwellings and/or accessory uses.
    • The unit must comply with the chapter's height, setback, size, parking, design, utility, inspection, certification, and registration requirements.
    • Maximum height while being towed is 14 feet; minimum size is 150 gross square feet and maximum size is 400 gross square feet.
    • The unit must connect to an approved water source and waste-disposal system approved by the Division of Environmental Health.
    • The unit must meet ANSI 119.5 or NFPA 1192, be inspected and certified by a qualified third-party inspector, display a compliance sticker or plaque, and be registered with the California Department of Motor Vehicles.
    • The chapter does not apply to recreational vehicles or travel trailers.

    maximum towing height: <= 14 feet · gross floor area: 150-400 square feet · regular fire-safety inspection interval: 5 years

    “Moveable Tiny Homes may be established as a single-family dwelling, accessory dwelling unit and/or second residential unit in all zoning districts that allow residential dwellings”
  • Who permits septicCounty

    OWTS and septic regulation administered under Mendocino County’s LAMP.

    • The LAMP is prepared pursuant to and used with the State Water Resources Control Board OWTS Policy.
    • Projects producing more than 10,000 gallons per day, high-strength waste projects, mobile home parks, and special occupancy parks may fall under North Coast Regional Water Quality Control Board jurisdiction.
    “The Local Agency will oversee the permitting of new and replacement OWTS that accept and treat flows of less than 10,000 gallons per day of domestic wastewater.”
    One more reviewed finding on this topic
    • County — Onsite wastewater treatment system inspection, monitoring, maintenance, repair, and permitting in Mendocino County.
      “The LAMP provides requirements for OWTS inspection, monitoring, maintenance, and repairs, including procedures to ensure that replacements or repairs to failing systems are done under permit from Mendocino County Environmental Health Division”
  • Septic permitRequired

    New onsite sewage systems and septic systems in Mendocino County.

    • A site evaluation report must be submitted to Environmental Health to obtain a permit.
    • The report must include all tests conducted, including failing soil tests and their locations.
    • At least one area, or two separate areas, large enough for initial and reserve absorption fields must be acceptable.
    • The review time is approximately 5–10 working days.
    • Current permit fees are established by the County Board of Supervisors.
    • Systems installed without permits or Environmental Health approval violate Mendocino County Code §16.08 and may incur an additional inspection fee equal to the permit fee or legal action.

    permit duration: 2 years (Permits may be renewed annually while current; once the system is installed and approved, no further renewal is necessary.)

    “The Site Evaluation Report must be submitted to the Environmental Health Division in order to obtain a permit.”
    One more reviewed finding on this topic
  • Septic inspectionRequired

    New standard and non-standard OWTS in Mendocino County.

    • All sites must be inspected by Environmental Health or a qualified site evaluator before final approval.
    • New non-standard systems require semi-annual operating permits and routine inspections by County staff and/or a service provider.
    • The LAMP also states that supplemental-treatment non-standard systems require annual permitting and monitoring and inspection by a service provider, County, or both; the LAMP should be consulted with the applicable OWTS technical standards to resolve the apparent semi-annual versus annual terminology.
    • Alternative OWTS designers must provide a system-specific operation and maintenance manual.
    • The operation manual must address maintenance, repair, or replacement of critical items within 48 hours following failure.

    non-standard operating permit frequency: semi-annual (The LAMP separately states annual permitting and monitoring for supplemental-treatment systems.) · critical-item corrective-action period: 48 hours

    “All sites regardless of installer type must be inspected by Environmental Health or a qualified site evaluator prior to final approval.”
    One more reviewed finding on this topic
    • Required — All Mendocino County OWTS installations, regardless of installer type, before final approval.
      “All sites regardless of installer type must be inspected by Environmental Health or a qualified site evaluator prior to final approval.”
  • Off-grid sanitationLimited

    Off-grid sanitation systems and wastewater disposal in Mendocino County.

    • Surface discharge of sanitary wastewater is not allowed by Mendocino County; proposed surface disposal is under North Coast Regional Water Quality Control Board jurisdiction.
    • Cesspools, seepage pits, and pit privies are not permitted for new construction.
    • Holding tanks are prohibited except for nuisance or health-hazard abatement; qualifying sewer-service-area situations; or campgrounds or similar temporary public facilities where public-agency maintenance is provided.
    • Significant RV holding-tank wastewater may fall outside the LAMP and is determined case by case with the North Coast Regional Water Quality Control Board.

    holding-tank exception threshold: < below 1% of estimated total daily flow (Amounts below 1% may not be considered significant RV holding-tank wastewater.)

    “Mendocino County will NOT allow any surface discharge of sanitary wastewater.”
  • Well permitRequired

    Construction, destruction, repair, or alteration of monitoring wells, cathodic wells, remediation wells, or borings under the Mendocino County Division of Environmental Health permitting process.

    • The permit is issued when signed and dated by a Mendocino County Health Officer.
    • Work must begin after permit issuance.
    • A State of California well completion report/log, as-constructed well log, or destruction log must be submitted within 15 days of completion for final approval.
    • For known contaminated sites, North Coast Regional Water Quality Control Board approval of a work plan is required before field work.
    • For sites within the Coastal Zone, Planning and Building requires a Coastal Zone Permit before field work and may require additional fees.

    well-log submission deadline: 15 days after completion (Final approval will not be given without the required log or sketch.)

    “Application is hereby made to the Mendocino County Division of Environmental Health for a permit to perform the work as indicated below at the following site location:”
    2 more reviewed findings on this topic
    • Required — New wells subject to Mendocino County Ordinance Chapter 16.04.
      “In addition, new wells are subject to issuance of a permit from the County, per Mendocino County Ordinance Chapter 16.04.”
    • Limited — Construction, destruction, repair, or alteration of monitoring wells, cathodic wells, remediation wells, or borings under the Mendocino County Division of Environmental Health monitoring-well application.
      “MONITORING WELL APPLICATION To Construct, Destroy, Repair, or Alter: Monitoring Wells, Cathodic Wells, Remediation Wells or Borings Application is hereby made to the Mendocino County Division of Environmental Health for a permit to perform the work as indicated below at the following site location:”
  • Mandatory utility hookupSewer (with conditions)

    New, expanded, or replacement OWTS where the nearest public sewer is within 200 feet of the proposed building.

    • Mendocino County Code sections 16.12 and 16.16 require connection to a public sewer when the nearest building proposed on a lot or parcel is no more than 200 feet from a public sewer.
    • Properties within designated sewer service areas require a district waiver before an OWTS permit may issue.
    • The LAMP states that development within 200 feet of a newly created state-permitted sanitation district is assumed to require connection to that district.

    nearest public sewer distance: <= 200 feet (Applies to the nearest building proposed on the lot or parcel.)

    “Mendocino County Code Section 16.12 and 16.16 require connection to a public sewer when the nearest building proposed on any lot or parcel is no more than 200’ from a public sewer.”
    One more reviewed finding on this topic
    • Conditional — New or replacement OWTS where public sewer systems or designated sewer service areas may serve the parcel.
      “Parcels within designated service areas will not be issued a permit until or unless the district issues a waiver based on specific conditions (see County Code Chapter 16.08).”
  • Subdividing landRegulated (with conditions)

    Minor subdivisions and divisions of land processed by Mendocino County Planning and Building Services.

    • Applicants must submit the completed application, tentative map, title report, signed forms, adequate access documentation, and applicable fees.
    • Environmental review is conducted as required by law.
    • Minor subdivisions are reviewed by the Minor Subdivision Committee, which recommends to the Planning Commission.
    • All conditions must be completed and the parcel map or unilateral agreement recorded within 24 months of approval; extensions may be requested, subject to the stated limits.
    • Current fees must be verified with a planner; CDFW fees are updated annually.

    minimum tentative map sheet size: 8½ by 11 inches · minimum tentative map scale: 1 inch to 100 feet (Unless otherwise approved by the Director) · initial completion and recording period: 24 months (18-month extensions may be requested; a second 18-month extension may also be requested, with total extensions not exceeding 36 months)

    “All minor subdivisions are reviewed by the Minor Subdivision Committee, who will make a recommendation to the Mendocino County Planning Commission.”
  • Driveway accessLimited

    Short-term rentals in the inland areas of unincorporated Mendocino County.

    • The parcel must have direct frontage on a publicly maintained road for the Room and Board pathway.
    • If the parcel does not have frontage on a publicly maintained road, a Major Use Permit is required.
    • The zoning code does not require the rental structure itself to be directly accessible via a public road.
    • If a parcel has access points via both public and private roads, the County evaluates access based on the regulation’s intent, including an opportunity for neighbors using shared private roads to provide input.
    “The zoning code states that a “Use Permit is required if the parcel does not have frontage on a publicly maintained road.” Frontage is defined in §20.008.028(J) as “that portion of a property line which abuts a legally accessible street right-of-way.” • This means the parcel itself must have direct frontage on a publicly maintained road. • However, the zoning code does not require that the rental structure be directly accessible via a public road. • If a parcel has multiple access points via both public and private roads, the County will evaluate access based on the intent of the regulation: ensuring that neighbors using shared private roads have an opportunity to provide input.”
    One more reviewed finding on this topic
    • Required — Residential development in the County's C Cluster Combining District when the clustering provisions apply.
      “Access to the residential development shall be via a common easement or driveway.”
  • Building in a floodplainLimited

    New construction, substantial improvements, and other development in unincorporated Mendocino County areas of special flood hazard.

    • All new construction and substantial improvements must be adequately anchored against flotation, collapse, and lateral movement from hydrodynamic and hydrostatic loads, including buoyancy.
    • New construction and substantial improvements must use flood-resistant materials and methods that minimize flood damage; service facilities must be designed or located to prevent floodwater entry or accumulation.
    • Residential construction and substantial improvements must meet zone-specific lowest-floor elevation requirements, including at least two feet above the base flood elevation in A zones and other zones, with additional AO-zone requirements.
    • Lowest-floor elevation must be certified by a registered professional engineer or surveyor and verified by the community building inspector.
    • Nonresidential construction must either meet the elevation standard or be floodproofed with watertight, substantially impermeable walls, structural resistance to hydrostatic and hydrodynamic loads and buoyancy, and professional certification.
    • Enclosed areas below the lowest floor are limited to parking, building access, or storage and must provide automatic hydrostatic equalization openings or professional certification.
    • On-site waste disposal systems must be located to avoid impairment or contamination during flooding.
    • The source identifies the provision as Ordinance No. 4385, adopted June 6, 2017; it does not state an effective date.

    minimum elevation above base flood elevation for residential construction in A zones and other zones: >= 2 feet (AO zones have separate depth-number and highest-adjacent-grade requirements) · minimum flood-opening area for enclosed areas below lowest floor: per 1 square inch per square foot (At least two openings; bottom of openings no higher than one foot above grade, or professional certification)

    “In all areas of special flood hazards the following standards are required: All new construction and substantial improvements shall be adequately anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy.”
    2 more reviewed findings on this topic
    • Required — Construction or other development within an area of special flood hazard established under Mendocino County Code Section 22.17.210.
      “A development permit shall be obtained before any construction or other development begins within any area of special flood hazard established in Section 22.17.210.”
    • Required — Construction or other development within areas of special flood hazard in the unincorporated lands of Mendocino County.
      “This ordinance shall apply to all areas of special flood hazards within the unincorporated lands of Mendocino County. [...] A development permit shall be obtained before any construction or other development begins within any area of special flood hazard established in Section 22.17.210.”
  • Short-term rentalsLimited

    Short-term rentals in the inland areas governed by Mendocino County Zoning Code Division I.

    • The county memo states that Division I has no specific STR regulations, but historically permits STRs under the Room and Board provisions in §20.164.015(L).
    • The Room and Board provision allows no more than two rooms for transient guests when the parcel has frontage on a publicly maintained road.
    • A Major Use Permit is required if the parcel lacks frontage on a publicly maintained road.
    • The County interprets the provision to allow the entire residential structure as an STR, subject to business-license requirements for Room and Board.
    • STRs are an accessory use and must be secondary to a principally permitted or permissible primary use.

    rooms under quoted Room and Board text: <= 2 rooms (The County memo states that the County interprets the provision to allow the entire residential structure as an STR.)

    “Mendocino County’s inland zoning ordinance (Division I) does not contain specific regulations addressing short- term rentals (STRs). However, the County has historically permitted STRs under the Room and Board provisions outlined in §20.164.015(L) of the zoning code. This section allows property owners to rent out “not more than two (2) rooms for occupancy by transient guests for compensation or profit, provided the parcel has frontage on a publicly maintained road.” If a property does not have frontage on a publicly maintained road, a Major Use Permit is required.”
  • Permit feesVariable (with conditions)

    County building-permit fees calculated under the Title 18 valuation fee framework.

    • The Board of Supervisors may establish the valuation policy by resolution.
    • The valuation fee schedule is contained in Title 18 and codes adopted by Title 18.
    • The policy is based on International Code Council building valuation data.
    • If no Board policy resolution exists, Planning and Building Services may use International Code Council valuation data.
    • The Building Official may use the RSMeans Square Foot Cost Book at their discretion.
    “The Board of Supervisors may by resolution establish its policy governing the determination of value for the purpose of establishing the fees”
  • Permit processPartial

    Building permits requiring plan review in unincorporated Mendocino County.

    • Submit an application, plans, site map, and form of payment.
    • An initial payment is required at submission and remaining fees are paid before issuance.
    • Applicable outside agencies may include CalFire or a local fire jurisdiction, school, sewer, and water agencies.
    • Applicable County reviews may include Building Division, Planning Division, and Environmental Health Department.
    • Corrections require a correction letter, correction work, and resubmittal.
    • After issuance, required inspections and any reinspections must be scheduled; a final inspection is required.
    • Commercial applications require documents stamped by the project's architect or engineer, although non-structural exceptions exist.
    • The workflow is a simplified visualization and does not guarantee a specific result.
    “Submit Application and Initial Payment to Planning and Building Services Department”

California rules that apply here

  • Camping on your landLimited

    Camping in units operated by the California Department of Parks and Recreation statewide.

    • Camping is confined to areas designated for that purpose.
    • Occupancy by the same persons, equipment, or vehicles is generally limited to 30 days in any calendar year in that unit.
    • The Department may establish shorter or longer occupancy limits.
    • When a shorter seasonal limit applies, the camper must vacate the campsite and may not reregister in the unit until 48 hours have expired, measured from 12:00 noon on the checkout day to 12:00 noon on the second day following.
    • A district superintendent may permit one-night camping in a day-use area or portion of one, subject to Department-established fees and vehicle limitations; occupants must vacate by 9:00 a.m. the following morning.
    • California State Parks' current reservation policy states that each campground has a consecutive-night limit, requires a 48-hour absence after that limit, and generally has a 30-night annual maximum, subject to individual park policies.

    general annual occupancy limit: 30 days per calendar year per unit (The Department may establish shorter or longer limits of occupancy.) · return interval after shorter seasonal limit: 48 hours (Measured from 12:00 noon of the checkout day to 12:00 noon of the second day following.) · one-night camping in day-use area: 1 night (Only if permitted by the district superintendent; occupants must vacate by 9:00 a.m. the following morning.)

    “Occupancy by the same persons, equipment, or vehicles of any camping facility is limited to a total of 30 days in any calendar year in that unit.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Temporary camping in California special occupancy parks, including parks containing recreational vehicles, tents, or camping cabins.
      ““Special occupancy park” means a recreational vehicle park, temporary recreational vehicle park, incidental camping area, or tent camp.”
  • Manufactured homesAllowed (with conditions)

    Occupancy of manufactured homes inside or outside mobilehome parks in California.

    • The manufactured home must satisfy applicable federal standards and California Manufactured Housing Act and Title 25 requirements.
    • Installation and approval for occupancy are governed by the Mobilehome Parks Act.
    • HCD or a local enforcement agency with assumed Mobilehome Parks Act authority is responsible for ensuring compliance with statutory construction and maintenance requirements.
    • Local agency approvals may be necessary for the project.

    minimum width for a new manufactured home: >= 8 body feet (The statutory definition also includes units at least 40 body feet in length.) · minimum erected floor area for a new manufactured home: >= 320 square feet

    “MHs may be occupied outside or inside of mobilehome parks and installation and approval for occupancy is governed by the Mobilehome Parks Act (MPA), HSC Sections 18200, et seq., and Title 25, CCR Sections 1000, et seq.”
  • Accessory dwellingsAllowed (with conditions)

    ADUs and junior ADUs subject to California State ADU Law.

    • Approval is ministerial and without discretionary review or a hearing.
    • Development standards must be objective and knowable in advance.
    • The local permitting agency must determine application completeness and provide written notice within 15 business days.
    • If an application is incomplete, the agency must identify missing items and explain how to complete it.
    • Local site, building, health, safety, fire, utility, and other applicable requirements continue to apply.

    written completeness determination: <= 15 business days (Measured from the permitting agency's receipt of the application.) · final written determination after appeal: <= 60 business days (Applies after receipt of the written appeal.)

    “A permit application for an accessory dwelling unit shall be considered and approved ministerially without discretionary review or a hearing [...] A permitting agency shall determine whether an application to create or serve an accessory dwelling unit is complete and provide written notice of this determination to the applicant not later than 15 business days after the permitting agency received the application.”
  • Campground & park staysLimited

    Occupancy and use of manufactured homes and mobilehomes in California mobilehome parks and other locations subject to HCD jurisdiction.

    • HCD administers titling and registration for manufactured homes and mobilehomes.
    • HCD-inspected mobilehome parks are subject to health and safety enforcement where local government has not assumed enforcement.
    • Manufactured/mobilehome park regulations address construction, use, maintenance, and occupancy.
    • Separate local land-use, building, fire, health, and utility requirements may apply.
    “MHs may be occupied outside or inside of mobilehome parks and installation and approval for occupancy is governed by the Mobilehome Parks Act (MPA), HSC Sections 18200, et seq., and Title 25, CCR Sections 1000, et seq.”
    One more reviewed finding on this topic
    • Limited — Occupancy and use of recreational vehicles in California special occupancy parks and designated RV sections of mobilehome parks.
      “Unless otherwise allowed by a local ordinance, RVs generally may be occupied only in mobilehome parks or special occupancy parks governed by the Mobilehome Parks Act”
  • county zoning authorityGeneral

    California county legislative bodies' authority to adopt zoning ordinances regulating buildings, structures, land uses, lots, yards, open space, lot coverage, intensity of use, parking, loading, and setbacks within county jurisdiction, including unincorporated areas.

    • The authority is exercised pursuant to Government Code Chapter 4, Zoning Regulations.
    • The statute separately authorizes city legislative bodies; incorporated municipalities may exercise their own zoning authority.
    • Government Code Section 65850 also lists authority to regulate signs and billboards, building and structure location, height, bulk, number of stories, and size, lot and open-space size and use, lot coverage, intensity of land use, offstreet parking and loading, and building setback lines.
    • The cited section states it was amended by Stats. 2017, Ch. 376, Sec. 1, effective January 1, 2018.
    “The legislative body of any county or city may, pursuant to this chapter, adopt ordinances that do any of the following:”
  • county building authorityGeneral

    California counties administering and enforcing state building standards through county building departments, including residential construction in unincorporated areas.

    • Each county must maintain building standards and state building regulations in the office of the building official responsible for administration and enforcement of state building standards.
    • The statewide Title 24 standards apply subject to statutory exceptions and any authorized local amendments or local requirements.
    • The cited HCD bulletin concerns the 2019 California Building Standards Code and its July 1, 2021 supplement; later code editions may supersede those particular edition dates.
    “These codes shall be maintained in the office of the building official responsible for the administration and enforcement of state building standards”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Lot coverage — Lot coverage in unincorporated Mendocino County, including Coastal Zone parcels.
  • Agricultural exemption — Agricultural building permit exemptions in unincorporated Mendocino County.

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Mendocino County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from California’s water agency.

Actively managed

This basin is under active state management — new water use is scrutinized, though a domestic well is usually still allowed.

Household wellPermit required — restricted

California requires no STATE permit for a domestic well — wells are permitted by the county — but under SGMA a Groundwater Sustainability Agency can meter or restrict new wells in medium/high-priority and critically overdrafted basins, and Executive Order N-7-22 requires counties in those basins to get GSA verification that a new well is consistent with the Groundwater Sustainability Plan before permitting.

Limit: 2 acre-feet/year de minimis under SGMA (Water Code §10721(e)) — largely exempt from GSA metering/fees

California DWR / State Water Board — SGMA de minimis & EO N-7-22 Action 9 FAQ ↗
  • Ukiah Valley Basin — Medium Prioritypartial of county

    Medium-priority SGMA basin (DWR 2019 Basin Prioritization) requiring an adopted Groundwater Sustainability Plan; a new well is subject to GSA consistency review under Executive Order N-7-22. De minimis domestic wells (<2 af/yr) are generally exempt from GSA metering but still need a county permit.

    California DWR — SGMA Basin Prioritization (2019) ↗

Hybrid state (appropriation + riparian). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the California state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Mendocino County, California

Is Mendocino County a good place to live off-grid or homestead?

Mendocino County scores 56/100 on the Bolthole Index, a solid county profile. Its strengths: sparse surroundings — about 12,223 people within 15 miles and manageable long-term carry cost. Watch-outs: elevated current hazard exposure and more administrative friction around building and land use.

Do you need a building permit in Mendocino County, California?

Mendocino County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Mendocino County Environmental Health Division (Land Use Program). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Mendocino County?

Living in an RV on your own land in Mendocino County is limited to specific cases: Temporary camping involving recreational vehicles on private real property in the county zoning area. Allowed only in the R-R, U-R, A-G, R-L, F-L and T-P zoning districts. Maximum 60 days in any six-month period. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Mendocino County, California?

Land in Mendocino County runs about $6,511 per acre, based on the latest county data.

What is the water situation in Mendocino County?

Mendocino County gets about 51.9" of rain a year, with severe drought in roughly 34.2% of years. On water rights, Mendocino County lies in the Ukiah Valley Basin — Medium Priority — Medium-priority SGMA basin (DWR 2019 Basin Prioritization) requiring an adopted Groundwater Sustainability Plan; a new well is subject to GSA consistency review under Executive Order N-7-22. De minimis domestic wells (<2 af/yr) are generally exempt from GSA metering but still need a county permit..

How remote is Mendocino County?

A typical private-land location has about 12,223 people within 15 miles and 4,688,218 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

How Mendocino compares in California

Compare side-by-side →See all 58 California counties ranked →