Unincorporated Kern County, California requires a building permit, issued by the county's Public Works Building Inspection Division1. Zoning comes from the county's Planning & Natural Resources Department and covers unincorporated land only, not the incorporated cities2. Septic permits come from the Kern County Environmental Health Division wherever sewer is not available within 200 feet3. Living in an RV on private land is generally unlawful4.
At a glance
- Building permit
- Required in unincorporated Kern County; issued by Public Works Building Inspection, under the 2025 California Residential Code for houses15
- Zoning
- Countywide Zoning Ordinance (Chapter 19) for unincorporated land only; cities are excluded62
- Septic
- County permit required to construct, reconstruct or repair a system; unavailable where sewer is within 200 feet3
- RV living
- Generally unlawful on private land outside listed parks and camping areas; limited exceptions require county approval or an active construction permit4
- Owner-builder
- Contractor-license exemption (Business and Professions Code 7044) for qualifying owners; building permits, inspections and zoning still apply7
- Minimum lot size
- Set per zoning district; a zone modification can reduce it by up to 15%, more needs a variance8
- Setbacks
- In A, A-1, R-1 and R-2 zones: 5 ft side and rear yards; front setback measured from the road centerline (55 ft on local streets, never under 25 ft from the right-of-way)9101112
- Manufactured/mobile home
- Allowed outside parks with conditions: DMV/foundation registration, HCD insignia, 5-ft property-line setback13
- Tiny home / ADU
- A tiny home gets state ADU treatment only if it meets the legal ADU definition; other classifications follow their own occupancy rules1415
Who to call
Building permits
Kern County Public Works Department — Building Inspection Division
Residential and commercial building permits and inspections for unincorporated Kern County
Public Services Building, 2700 "M" Street, Suite 400, Bakersfield, CA 93301
Zoning
Kern County Planning & Natural Resources Department
Zoning determinations, zone changes/variances, and the Zoning Ordinance (Title 19) for unincorporated Kern County
Septic permits
Kern County Public Health Services Department — Environmental Health Division
Onsite wastewater treatment system (septic) construction, reconstruction and repair permits for Kern County
1800 Mt. Vernon Avenue, Bakersfield, CA
Contact details are copied from each office’s official page and were checked against it on October 16, 2026.
Off-grid gear
Going off-grid in Kern County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
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Do you need a building permit in Kern County, California?
Yes, in unincorporated Kern County. The county's Public Works Building Inspection Division requires a permit for erection, construction, enlargement, alteration or repair of buildings1. Detached one- and two-family homes and townhouses are built to the 2025 California Residential Code with Kern County amendments5. Inspections are required for all gypsum board installations, and an inspection record card must stay on the job site16. A parcel in a wildland-urban interface area needs a separate permit for each regulated building or structure, subject to listed exemptions17. Development in a special flood-hazard, flood-related erosion or mudflow area also needs a floodplain development permit before work begins18.
Owner-builders: California's contractor-license exemption lets an owner personally do the work, use employees paid only wages, or hire licensed trades directly. A homeowner improving a principal residence must have lived there for the 12 months before completion, and selling or offering for sale within one year after completion raises a presumption that the work was for sale7. The exemption does not waive building permits, inspections or zoning7.
Inside Delano, California City and Arvin, the city issues its own building permits Delano19, California City20, Arvin21. The county's rules apply to unincorporated land only, and septic permits for any address still come from county Environmental Health.
Who is the Kern County building department, and how do you reach them?
Kern County Public Works' Building Inspection Division issues building permits and performs inspections for unincorporated Kern County; reach them at the Public Services Building, 2700 "M" Street, Suite 400, Bakersfield, CA 93301, phone (661) 862-510022. California law puts this duty on the county: every county building department must enforce the State Building Standards Code within its own jurisdiction, which is why Bakersfield city permits and Kern County unincorporated permits come from two different offices23. For zoning questions specifically — what you can build where — the Kern County Planning & Natural Resources Department is the right call instead, at 661-862-5263 or zoning@kerncounty.com24.
Does Kern County have zoning?
Yes, but only for unincorporated land: the Kern County Zoning Ordinance, Chapter 19 of the Code of Ordinances, covers every zoning district in the county except the incorporated cities2. A parcel just outside a city's limits and one just inside can follow different rules25. Delano, Ridgecrest, McFarland and California City set their own zoning inside city limits Delano26, Ridgecrest27, McFarland28, California City29.
A single-family home is allowed by right in residential districts, and Planning & Natural Resources publishes the standards for each district30. Minimum lot sizes are set per district; a zone modification can shrink a lot by up to 15%, and anything beyond that needs a variance8.
Setbacks for buildings are the same shape in the Exclusive Agriculture (A), Limited Agriculture (A-1), R-1 and R-2 districts: the front setback is 55 feet from the centerline of a local street or access easement (70 feet from a secondary highway, 80 feet from a major highway) but never under 25 feet from the right-of-way, and side and rear yards are at least 5 feet, with 10 feet on the street side of corner lots9101112. Through lots follow the front-yard rule at the rear9. R-1 and R-2 front yards can differ under Section 19.08.1201112.
How do septic permits work in Kern County?
The Kern County Environmental Health Division regulates onsite wastewater treatment systems throughout unincorporated Kern County31. A county permit is required to construct, reconstruct or repair a septic system, and the county will issue one only where a sanitary sewer is not available within 200 feet of the structure3. Soil conditions, topography, high groundwater or other site factors can make an onsite system unsuitable3. Only about 19.3% of Kern County soils are rated without severe limits for a conventional drain field, so make the septic evaluation a purchase contingency rather than assuming a rural parcel will support a standard system32. Reach Environmental Health at (661) 321-3000 or 1800 Mt. Vernon Avenue, Bakersfield33.
Can you live in an RV or tiny home on your land in Kern County?
In unincorporated Kern County, placing or occupying an RV on private land outside mobile home parks, travel-trailer parks, incidental camping areas and tent camps is unlawful unless an exception applies4. Dead storage is allowed only where zoning permits it on property with an existing conforming use, and private recreational use needs approval from the Planning Commission or Board of Supervisors4. While you build, the building official may grant temporary RV occupancy at a construction site where building permits have been issued; that approval ends when construction is complete and the RV must be removed4. Any RV must also comply with the county's building regulations and zoning ordinance, including its sewage and water systems4.
A manufactured or mobile home outside a park must comply with county building and zoning rules; more than one on a parcel requires zoning authorization and proof that the additional occupant is an immediate family member who pays no rent34. A tiny home receives California ADU treatment only when it meets the statutory ADU definition, and applicable building, health, safety, fire, zoning and permitting requirements still apply14. Temporary tent camping on private land is not confirmed; ask Planning & Natural Resources.
Building a home in Kern County: the steps, in order
- Confirm the parcel's zoning district, minimum lot size and setbacks with Kern County Planning & Natural Resources before designing the home28.
- Ask whether the site is in a special flood-hazard, flood-related erosion or mudflow area; covered sites need a floodplain development permit before construction18.
- If sewer is not available within 200 feet, arrange the site work and apply to Environmental Health for the required septic permit3.
- If you need a well, obtain the required permit from the applicable local environmental health agency or water district before construction35.
- Check whether the parcel is in a wildland-urban interface area, where each regulated building or structure needs a separate WUI permit subject to listed exemptions17.
- Apply to Public Works Building Inspection for the building permit; owner-builder status does not waive building permits or inspections, and houses are built to the 2025 California Residential Code517.
What to check before you buy land in Kern County
Septic and soils: about 19.3% of Kern County soils are rated without severe limits for a conventional drain field, and a septic permit cannot be issued where sewer is available within 200 feet of the structure323. Flood exposure: development in mapped special flood-hazard, flood-related erosion or mudflow areas needs a floodplain development permit before work begins18. Water: a new or modified well needs a permit from the applicable local environmental health agency or water district35. Climate: Kern County experienced severe drought in about 41.5% of measured years and is projected to average roughly 41.6 days per year at or above 100°F by mid-century3637. About 31% of the county is federal land38. The effective property tax rate is about 0.9%, with a median annual bill near $2,8333940.
Watch-outs
- Living in an RV on bare private land is generally unlawful in unincorporated Kern County; the main exception is temporary occupancy approved by the building official on a site with issued building permits, which ends at completion4.
- Kern County's minimum dwelling size, lot-coverage standards and any agricultural building exemption could not be confirmed; ask Planning & Natural Resources for the standards in your parcel's zoning district before relying on an assumption30.
- A parcel in a special flood-hazard, flood-related erosion or mudflow area needs a floodplain development permit before construction or other development begins18.
- Placing a second mobile home on a parcel outside a mobile home park is not a general right in unincorporated Kern County; it requires zoning authorization and written proof the second occupant is an immediate family member paying no rent34.
Sources
- Kern County Public Works - Building Permit Application (2026 county census)
- Planning Documents - Kern County Planning & Natural Resources Dept., quoted and re-checked
- Kern County Onsite Systems Manual, quoted and re-checked
- Kern County Code of Building Regulations, quoted and re-checked
- Kern County Code, § 17.06.030—California Residential Code adopted, quoted and re-checked
- Planning Documents - Kern County Planning & Natural Resources Dept. (2026 county census)
- California Business and Professions Code section 7044, quoted and re-checked
- Zoning Ordinance - Kern County Planning & Natural Resources Dept., quoted and re-checked
- Kern County Code, § 19.12.070—Yards and setbacks, A district, quoted and re-checked
- Kern County Code, § 19.14.070—Yards and setbacks, A-1 district, quoted and re-checked
- Kern County Code, § 19.18.070—Yards and setbacks, R-1 district, quoted and re-checked
- Kern County Code, § 19.20.070—Yards and setbacks, R-2 district, quoted and re-checked
- Kern County Code of Building Regulations, Sections 17.44.050-17.44.070, quoted and re-checked
- Accessory Dwelling Unit Handbook, March 2026, quoted and re-checked
- Accessory Dwelling Unit Handbook March 2026, quoted and re-checked
- Kern County Code of Building Regulations — Complete PDF, quoted and re-checked
- Kern County Code of Building Regulations — Complete PDF, quoted and re-checked
- Kern County Code of Building Regulations, Chapter 17.48 Floodplain Management, quoted and re-checked
- Delano: §20.11.200 - Accessory dwelling units (Kern County), quoted and re-checked
- California City: Inspections (Kern County), quoted and re-checked
- Arvin: FAQs - Building Division (Kern County), quoted and re-checked
- Kern County Public Works Department — Building Inspection Division (kernpublicworks.com)
- Information Bulletin 2021-02: 2019 California Building Standards Code Supplement (California statewide rule), quoted and re-checked
- Kern County Planning & Natural Resources Department (kernplanning.com)
- Commercial Zoning Layer - Kern County GIS, quoted and re-checked
- Delano: Planning (Kern County), quoted and re-checked
- Ridgecrest: Ridgecrest Code Sec. 106-324. Dwellings in all residential zones (Kern County), quoted and re-checked
- McFarland: McFarland Code 17.12.020 - R-1 Zone uses permitted (Kern County), quoted and re-checked
- California City: Applications (Kern County), quoted and re-checked
- Zone Change, quoted and re-checked
- Local Agency Management Program for Onsite Wastewater Treatment Systems, Kern County, California, quoted and re-checked
- 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
- Kern County Public Health Services Department — Environmental Health Division (kernpublichealth.com)
- Kern County Code of Building Regulations, quoted and re-checked
- Well Standards (California statewide rule), quoted and re-checked
- Share of years in severe drought: Bolthole Index county data
- Projected mid-century days at or above 100°F: Bolthole Index county data
- Federal land share: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written October 16, 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.