Bolthole Index

Yakima County, Washington

Building permits, zoning and land rules in Yakima County, Washington

57Index Score / 100
#18 of 39 in Washington

Unincorporated Yakima County, Washington requires building permits for regulated construction and applies county zoning within its land-use jurisdiction12. Yakima Health District issues septic permits where septic is allowed; mapped floodplain projects need additional county review345. Private-land RV occupancy is temporary, with a separate permit pathway while a permanent home is under construction67.

At a glance

Building permit
Required before regulated construction in unincorporated Yakima County1
Zoning
Yes; Title 19 governs land in the county's unincorporated jurisdiction2
Septic permit
Required for a new or replacement system where septic is allowed4
RV use
A single RV is limited to temporary use; longer construction occupancy needs permits67
Tiny house
A dwelling is regulated by the building code; park models follow different limits8
Owner-builder
Contractor-registration exemption is conditional, not a permit exemption9
Minimum home size
Title 19 sets no square-foot minimum, but district development standards still apply1011

Who to call

Building permits

Yakima County Building & Fire Safety Division

Building permit applications, plan review, inspections, grading permits, flood hazard determinations, and manufactured or modular building placement

(509) 574-2300

buildinginfo@co.yakima.wa.us

128 North 2nd Street, 4th Floor, Courthouse, Yakima, WA 98901

Online permits →

Planning & zoning

Yakima County Planning Division

Zoning administration and land-use applications for unincorporated Yakima County

(509) 574-2300

Planning_Info@co.yakima.wa.us

128 N. 2nd Street, 4th Floor, Courthouse, Yakima, WA 98901

Online permits →

Septic permits

Yakima Health District Environmental Health, On-Site Sewage Program

Permitting, review, inspection and education for on-site sewage systems in Yakima County

(509) 249-6508

YHD.HelpDesk@co.yakima.wa.us

1210 Ahtanum Ridge Drive, Union Gap, WA 98903

Roads & driveways

Yakima County Transportation Services Division

County road administration, engineering and maintenance; contact for a proposed approach from county right-of-way

(509) 574-2300

128 N 2nd Street, 4th Floor, Yakima, WA 98901

Contact details are copied from each office’s official page and were checked against it on October 15, 2026.

Off-grid gear

Going off-grid in Yakima 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 Yakima County, Washington?

Yakima County requires a permit before residential construction and other work regulated by the International Codes begins in its unincorporated jurisdiction1. Work exempt from a building permit may still need zoning, utility, electrical, plumbing or mechanical approval1. Yakima County reviews plans against current building codes and state and local regulations; ask Building & Fire Safety which code editions apply to your application1213. All permitted work must remain exposed for inspection until approved, and final inspection and approval are required before occupancy or use; we could not confirm a separate certificate requirement for every home1415. An owner-builder can qualify for an exemption from contractor registration when working on their own property, except when the work is for sale, demolition or lease; project permits still apply161. Do not assume a barn or farm structure is exempt from county review because the available agriculture provision concerns contractor registration17.

Who handles Yakima County building permits, and how do you reach them?

Yakima County Building & Fire Safety handles applications, plan review and inspections for new construction, alterations, grading, changes of use, relocated structures, and modular or manufactured-home placement13. Reach the division at (509) 574-2300 or buildinginfo@co.yakima.wa.us; Accela Citizen Access supports the county's online application process13. Project Coordinators route applications to the necessary reviewing divisions18. Building permit fees typically depend on square footage, construction type and occupancy; the county announced a 3.1 percent increase and an energy-code permit fee effective April 1, 20261920. Inside Yakima, Toppenish and Selah, city offices handle building permits; Yakima Health District remains the on-site sewage authority2122233.

Does Yakima County have zoning?

Yakima County administers Title 19 zoning and reviews subdivision applications in unincorporated land within its land-use jurisdiction22425. Minimum lot size for land divisions and lot-line adjustments is district-specific; wastewater, access and other requirements can increase the area needed2627. Ask Planning for the parcel's district, setbacks, coverage and height limits2829303132. Title 19 sets no square-foot minimum dwelling size, but manufactured homes need siting review1033. ADUs are allowed conditionally; ask Planning to confirm the parcel's ADU limit and shared-water requirements before designing a separate dwelling34353628.

Yakima, Sunnyside, Grandview, Toppenish and Selah administer their own zoning3738394041. Union Gap, Zillah, Mabton, Tieton and Harrah also administer their own zoning4243444546. Yakima Health District still handles on-site sewage review; Tieton also requires a public-works written permit for private sewage systems347.

How do septic permits work in Yakima County?

Yakima Health District administers on-site sewage permitting, review and inspection throughout Yakima County348. A new or replacement on-site system needs a site-and-soil evaluation, design review, application fee, approved design and permit before installation begins449. The Health District performs the final inspection before a new system is covered, then can sign off on the residence's Certificate of Occupancy5051. If an available public sewer is within 200 feet, or the parcel is in a city utility service area, sewer connection may be required instead of septic52. Off-grid homes in Yakima County still need Health District approval for septic where sewer is unavailable and septic is allowed53. Only about 21.1 percent of county soils are rated without severe limits for a conventional drain field, so settle wastewater feasibility before locating the house54. Reach Environmental Health at (509) 249-6508 or YHD.HelpDesk@co.yakima.wa.us48.

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

Outside an approved campground or RV park, unincorporated Yakima County allows one self-contained RV on privately owned land for temporary use of no more than 30 days when the county's ownership, equipment and no-addition conditions are met6. Overnight occupancy by two or more camping units must meet campground or RV-park requirements55. While a permanent dwelling is being built on the same lot, an RV may instead qualify for up to 3 years with both a temporary-use permit and an active residential building permit, and it must be removed within 30 days after the home is occupied7. A tiny home used as a dwelling is a building regulated by the state building code; a park-model RV under 400 square feet is treated as temporary recreational equipment unless the stated manufactured-home-community exception applies8. Local zoning and installation approval still control where either type may go8.

How do you build a home in Yakima County, step by step?

  1. Ask Planning to identify the zoning district, allowed dwelling type and district-specific lot and setback standards28292730.
  2. Ask the Yakima Health District whether sewer connection is required or septic is allowed, then complete the site-and-soil evaluation before fixing the house location524.
  3. Resolve access through the Road Approach Permit process for a connection to county right-of-way, or document legal access to an approved county-road location if the parcel lacks frontage56.
  4. Ask Building & Fire Safety for a Flood Hazard Determination if the parcel is FEMA-mapped; a structure within the 100-year floodplain needs a Flood Hazard Development Permit, with Flood Development review during plan review and elevation documentation before building-permit issuance57513.
  5. Submit plans to Building & Fire Safety, whose Project Coordinators route the application to required divisions1318.
  6. Keep permitted work exposed for required inspections and obtain final approval before occupancy or use1415.

What should you check before buying land in Yakima County?

Before buying land in unincorporated Yakima County, ask Planning about district-specific lot area, setbacks, coverage and height, especially if you intend to divide the parcel28273031322426. A county-road approach is reviewed case by case, and the listed Road Approach Permit fee is $27556. We could not confirm a complete private-well permit rule, so ask Environmental Health and the applicable water provider before closing48. FEMA-mapped projects need flood review and elevation documentation; new or replacement manufactured homes are prohibited in floodways5. Median property taxes are about $2,299 per year at an effective rate near 0.8 percent5859.

Watch-outs

  • A single RV used outside an approved campground or RV park is limited to temporary use under county conditions; permanent residential RV use is not established6.
  • A parcel within 200 feet of an available public sewer, or inside a city utility service area, may have to connect instead of installing septic52.
  • A structure within the 100-year floodplain requires a Flood Hazard Development Permit and county plan review; new or replacement manufactured homes are prohibited in floodways575.

Sources

  1. Homeowners Guide to the Building Process, quoted and re-checked
  2. Zoning & Subdivision, quoted and re-checked
  3. Septic Systems, quoted and re-checked
  4. Building a New Septic System, quoted and re-checked
  5. FEMA designated Floodplain and Floodway, quoted and re-checked
  6. Title 19 Unified Land Development Code, quoted and re-checked
  7. Yakima County Code Title 19, Chapter 19.18, quoted and re-checked
  8. Modular Structures, quoted and re-checked
  9. RCW 18.27.090 Exemptions, quoted and re-checked
  10. Title 19 White Paper, quoted and re-checked
  11. Title 19 Unified Land Development Code, quoted and re-checked
  12. Building, quoted and re-checked
  13. Yakima County Building & Fire Safety Division (yakimacounty.us)
  14. Building Inspection Program, quoted and re-checked
  15. Building Inspection Program, quoted and re-checked
  16. RCW 18.27.090 Exemptions, quoted and re-checked
  17. RCW 18.27.090 Exemptions, quoted and re-checked
  18. Permit Processing, quoted and re-checked
  19. Building, quoted and re-checked
  20. Building, quoted and re-checked
  21. Yakima: City of Yakima Planning Division Frequently Asked Questions (Yakima County), quoted and re-checked
  22. Toppenish: TMC 17.70.120 — Critical areas applicability (Yakima County), quoted and re-checked
  23. Selah: City of Selah Building Guide Packet (Yakima County), quoted and re-checked
  24. Zoning & Subdivision, quoted and re-checked
  25. Title 19 Unified Land Development Code, quoted and re-checked
  26. Yakima County Code Chapter 19.10 General Zoning Requirements, quoted and re-checked
  27. Title 19 Unified Land Development Code, quoted and re-checked
  28. Yakima County Planning Division (yakimacounty.us)
  29. Title 19 Unified Land Development Code, quoted and re-checked
  30. Title 19 Unified Land Development Code, quoted and re-checked
  31. Title 19 Unified Land Development Code, quoted and re-checked
  32. Title 19 Unified Land Development Code, quoted and re-checked
  33. Manufactured Home Application and Information, quoted and re-checked
  34. Yakima County Code 19.18.020 Accessory Buildings and Uses, quoted and re-checked
  35. Accessory Dwelling Unit Packet, quoted and re-checked
  36. Accessory Dwelling Unit Packet, quoted and re-checked
  37. Yakima: City of Yakima Planning Division Frequently Asked Questions (Yakima County), quoted and re-checked
  38. Sunnyside: City of Sunnyside, WA Municipal Code table of contents (eCode360) (Yakima County), quoted and re-checked
  39. Grandview: City of Grandview, WA municipal code table of contents (eCode360) (Yakima County), quoted and re-checked
  40. Toppenish: TMC 17.28.030 — R1 lot size and coverage (Yakima County), quoted and re-checked
  41. Selah: City of Selah Building Guide Packet (Yakima County), quoted and re-checked
  42. Union Gap: Union Gap Municipal Code 17.04.030, Table of permitted land uses (Yakima County), quoted and re-checked
  43. Zillah: City of Zillah, WA Municipal Code (eCode360) table of contents (Yakima County), quoted and re-checked
  44. Mabton: Mabton Code § 17.12.060, Lot size (Yakima County), quoted and re-checked
  45. Tieton: Tieton Municipal Code 17.08.040 — Density requirements (Yakima County), quoted and re-checked
  46. Town of Harrah: Town of Harrah, WA code of ordinances table of contents (eCode360) (Yakima County), quoted and re-checked
  47. Tieton: Tieton Municipal Code 13.04.040 — Private sewers or sewage disposal systems (Yakima County), quoted and re-checked
  48. Yakima Health District Environmental Health, On-Site Sewage Program (yakimacounty.us)
  49. Building a New Septic System, quoted and re-checked
  50. Septic Systems, quoted and re-checked
  51. Building a New Septic System, quoted and re-checked
  52. Building a New Septic System, quoted and re-checked
  53. Building a New Septic System, quoted and re-checked
  54. 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
  55. Title 19 Unified Land Development Code, quoted and re-checked
  56. yakimacounty.us, quoted and re-checked
  57. yakimacounty.us, quoted and re-checked
  58. Median property tax bill: Bolthole Index county data
  59. Effective property tax rate: Bolthole Index county data

Written October 15, 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, Yakima County requires a building permit for a home.

RuleYakima CountyKittitas CountyKlickitat CountyBenton CountyPierce CountyGrant CountySkamania County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsYakima Health DistrictCounty Public Health Dept.County Health Dept.Benton-Franklin Health DistrictTacoma-Pierce County Health Dept.County Health DistrictCounty Community Development

County locator

Yakima County in Washington

57
County map
Yakima County highlighted among the Washington counties · colored by Index score

How Yakima County scores

Seclusion42100% ev.
Self-Sufficiency54100% ev.
Admin Boringness41100% ev.
Durability56100% ev.
Property Autonomy50100% ev.
Carry Cost80100% 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 →

$358kTypical home
0.8%Property tax
$2,782Land / acre
26.4"Annual rain
11.5% of yrsSevere drought
4.3 / yr (+3.4)Mid-century 100°F days
38.1 daysMid-century dry spell
1.21" (+9.4%)Mid-century 1-day rain
1.19×Wildfire change factor
100%Forward climate coverage
$1,340Home insurance / yr
1.4% / yrInsurance growth
1.01%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
159,597People within 30 min
830,155People within 2 hr
116,139Radius comparison (15 mi)
59.8People / sq mi
25.4%Federal land
58.2%Land at 15% slope or less
21.1%Soils rated "not limited" for septic (strict USDA rating)
569,476 acWorkable land screen
41.9%Wooded land
65.5 tonsBiomass / forest ac
46.8°FAvg temp

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Cities and towns in Yakima 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: Grandview · Granger · Town of Harrah · Moxee · Town of Naches · Wapato · Zillah

Answers from the rulebook for Yakima County

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

Yakima County rules

  • Building permitRequired

    Residential construction and other work regulated by the International Codes in unincorporated Yakima County

    • The source states that permits are required prior to construction; separate exemptions exist for specified work.
    • Permit-exempt work may still require land-use, zoning, utility, electrical, plumbing, or mechanical approvals.
    “The International Codes require that prior to construction, a permit shall be obtained.”
  • Building code adoptedAdopted (with conditions)

    Building construction reviewed by Yakima County Building & Fire Safety.

    • Plans are reviewed for compliance with current building codes and state and local regulations.
    “Before a building permit is issued, a Plans Examiner reviews submitted plans to ensure compliance with current building codes, as well as state and local regulations.”
    One more reviewed finding on this topic
    • Adopted (with conditions) — Yakima County Public Services Building & Fire Safety Division
      “(2021) Adoption of 2018 International Codes and Title 13 Amendments for Yakima County Public Services Building & Fire Safety Division”
  • InspectionsRequired

    All construction or work requiring a building permit

    • Work must remain accessible and exposed until officially approved.
    • Inspection requests must be made at least one working day in advance.
    • A final inspection and approval are required before occupancy or use.
    “All construction or work requiring a permit must be inspected by the Building Official. The work must remain accessible and exposed for inspection until officially approved.”
  • Certificate of occupancyLimited

    Residences using a new septic system in Yakima County.

    • After the septic final inspection is approved, Yakima Health District can sign off on a Certificate of Occupancy for the residence.
    • The source does not establish a universal certificate-of-occupancy requirement for every building or use.
    “Once the final inspection is approved, the system may be covered, and YHD can sign off on a Certificate of Occupancy for your residence.”
    One more reviewed finding on this topic
    • Limited — Permitted construction before occupancy or use
      “Final Inspection: A final inspection and approval are required before occupancy or use.”
  • County-wide zoningPresent (with conditions)

    Yakima County zoning and development regulations in unincorporated county areas.

    • The county zoning page identifies Title 19, Unified Land Development Code, as an ordinance administered by the Zoning and Subdivision Section.
    • Municipal zoning may apply inside incorporated municipalities.
    “Zoning and Subdivision staff works with the following ordinances: Title 19: Unified Land Development Code”
    One more reviewed finding on this topic
    • Present (with conditions) — Land-use jurisdiction of unincorporated Yakima County
      “This Title applies to all of unincorporated Yakima County within the County’s land-use jurisdiction and includes:”
  • Local zoningPresent (with conditions)

    Land-use zoning in unincorporated Yakima County within the County's land-use jurisdiction.

    • Title 19 includes land-use zoning districts and use regulations, development standards, and land-division procedures.
    • This claim does not establish zoning rules administered by incorporated municipalities.
    “This Title applies to all of unincorporated Yakima County within the County’s land-use jurisdiction”
    One more reviewed finding on this topic
    • Present (with conditions) — County zoning in unincorporated Yakima County
      “(b) Subtitle 19.1 Land use zoning districts and use regulations and stormwater and erosion control;”
  • Zoning districtsPublished (with conditions)

    Yakima County zoning districts and associated land-development standards.

    • Title 19 contains district-specific tables for minimum lot area, setbacks, lot coverage, and building height.
    • The cited table includes SCC, LCC, and GC districts; other Title 19 chapters contain additional districts.
    “Table 19.13.020-1. Lot Standards, Setbacks, Lot Coverage and Building Height Requirements Subject Zone SCC LCC GC”
    One more reviewed finding on this topic
    • Published (with conditions) — Unincorporated Yakima County zoning districts and use regulations
      “(b) Subtitle 19.1 Land use zoning districts and use regulations and stormwater and erosion control;”
  • Minimum dwelling sizeNone

    Residential development regulated by Yakima County Title 19 in unincorporated Yakima County.

    • The finding concerns Yakima County Title 19; incorporated municipalities may have separate development regulations.
    • Title 19 regulates other development standards, including density, setbacks, height, lot size, and other physical standards.
    “A review of Yakima County Title 19 indicates that the zoning and development regulations do not establish minimum dwelling unit size requirements for residential units based on square footage.”
  • Minimum lot sizeSpecified

    Lots and structures in Yakima County zoning districts governed by Title 19.

    • Numeric standards vary by zoning district.
    • Minimum lot size may need to increase for Health District, Department of Health, Department of Ecology, specific uses, lot coverage, setbacks, access, landscaping, or other Title 19 requirements.
    • The Greenway Overlay minimum lot size is one acre in the cited table notes.

    minimum lot area: 10,000 square feet (SCC and LCC zones in the cited table; other zones differ)

    “Minimum lot area (1) 10,000 square feet 10,000 square feet 5,000 square feet”
    One more reviewed finding on this topic
    • Specified — Lots created, subdivided, short-platted, re-subdivided, or adjusted under applicable Yakima County zoning districts
      “Minimum lot size is the smallest lot size permitted in a particular zoning district or special standard when land is subdivided, short platted, re-subdivided, or when lot lines are adjusted.”
  • SetbacksSpecified

    Development in Yakima County zoning districts governed by Title 19.

    • Setbacks vary by zone and road/access condition.
    • Additional setbacks may apply to especially sensitive land uses adjacent to designated resource lands or activities.
    • Sitescreening requirements, temporary-turnaround exceptions, through-lot exceptions, and gate/garage entrance rules also apply.

    front setback: 25 feet from planned edge of right-of-way or easement (cited SCC/LCC/GC table)

    “Designated classified road (arterial or collector)* 25 feet from planned edge of right-of-way or easement”
  • Lot coverageSpecified

    Development in Yakima County zoning districts governed by Title 19.

    • Lot coverage varies by zoning district and may be reduced by landscaping/site-screening requirements.

    maximum lot coverage: 85% percent (SCC zone in cited table) · maximum lot coverage: 90% percent (LCC zone in cited table) · maximum lot coverage: 100% percent (GC zone, or less as required by landscaping)

    “Maximum lot coverage 85% 90% 100% or less as required by landscaping in YCC Chapter 19.21”
  • Building heightSpecified

    Buildings in Yakima County zoning districts governed by Title 19.

    • Height varies by zoning district.
    • Additional restrictions may apply within the Airport Safety Overlay.

    maximum building height: 35 feet (SCC zone in cited table) · maximum building height: 50 feet (LCC and GC zones in cited table)

    “Maximum building height - Additional restrictions may apply within the Airport Safety Overlay. See Section 19.17.030. 35 feet 50 feet 50 feet”
  • Living in an RVTemporary only (with conditions)

    Temporary occupancy of a camping or recreational vehicle on a lot in Yakima County's land-use jurisdiction while constructing a permanent dwelling, temporary caregiver housing, or another qualifying temporary use.

    • A Building Official temporary use permit is required.
    • For construction of a permanent dwelling, the dwelling must be on the same lot and the property owner must have an active residential building permit.
    • Construction-related RV occupancy may not exceed three years and must be removed within 30 days after occupancy of the permanent dwelling.
    • Caregiver RV occupancy is limited to six months, must be adjacent to an existing residence, must house a caregiver for a terminally ill relative, and requires medical documentation from a physician or osteopath that the person is in hospice care.
    • Other temporary uses must be allowed within the zoning district, are reviewed for access, traffic, noise, land-use compatibility, public health, and safety, and require annual permit renewal.
    • The RV must be on a lot under the same ownership as the RV, be independent and self-contained, have no permanent residential unit on the lot, retain its wheels and tires, and have no decks, porches, outdoor storage, skirting, or other exterior additions except a permanently attached awning.
    • Incorporated municipalities may impose separate land-use rules.

    maximum temporary occupancy while constructing permanent dwelling: <= 3 years (must be removed within 30 days of occupancy of the permanent dwelling) · removal after permanent dwelling occupancy: <= 30 days · maximum temporary caregiver occupancy: <= 6 months (terminally ill relative and hospice documentation required) · renewal interval for other temporary uses: per 1 year (only if allowed within the zoning district and approved after review)

    “The Building Official may issue temporary use permits for the following uses: [...] Such temporary use may not be maintained for a period exceeding three years.”
    One more reviewed finding on this topic
    • Temporary only (with conditions) — A single recreational vehicle on privately owned land outside an approved campground or recreational vehicle park.
      “for not more than 30 days for temporary use”
  • Camping on your landLimited

    Temporary camping outside approved campgrounds or recreational vehicle parks in unincorporated Yakima County.

    • A single RV may qualify for temporary use for no more than 30 days only if all Title 19 conditions are satisfied.
    • Land for overnight occupancy of two or more camping units must conform to the campground or RV-park requirements.

    maximum temporary use: <= 30 days (Single RV meeting Title 19 conditions)

    “overnight occupancy of two or more camping units”
  • Tiny homesLimited

    Tiny homes and park-model recreational vehicles

    • A tiny home used as a dwelling is regulated by the state building code.
    • A park-model recreational vehicle under 400 square feet on a permanent chassis is designed only for temporary recreational purposes and is subject to local zoning and land-use regulations.
    • State law provides an exception for residence use in a manufactured/mobile home community when hooked up to utilities.

    park-model recreational vehicle size threshold: < 400 square feet (must be mounted on a permanent chassis and used for temporary recreational purposes)

    “Normally, a “tiny home” is occupied and used as a dwelling, in which case it is a building regulated by the state building code. The exemption in the building code for small sheds and accessory structures does not apply to a structure used as a dwelling.”
  • Manufactured homesLimited

    Placement and occupancy of manufactured homes in Yakima County jurisdiction.

    • Homes must meet YCC 19.18.290 siting requirements.
    • Some areas may not allow manufactured or mobile homes; planning review is required.
    • Required permits and approvals may include county planning, transportation, Yakima Health District septic and well review, and sewer purveyor review.
    “All homes must meet all Siting Requirements in 19.18.290 Manufactured/Mobile Home Placement here. [...] Check zoning restrictions – Some areas may not allow manufactured or mobile homes.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units on eligible detached single-family residential lots governed by Yakima County Title 19.

    • An ADU is secondary to a detached single-family dwelling.
    • Within UGAs, up to two ADUs may be allowed; outside UGAs, one ADU may be permitted per lot if consistent with rural character, resource-land viability, and Comprehensive Plan goals and policies.
    • Off-street parking, building-code compliance, and primary-structure setbacks apply.
    • The ADU and primary residence must meet public-water and sanitary-disposal requirements, including Yakima Health District requirements.
    “An accessory dwelling unit (ADU) is a permitted use, secondary to the primary use of a detached single-family dwelling, subject to all of the following conditions:”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Accessory dwelling units in zoning districts allowing residential uses
      “A: Accessory dwelling units can be built in any zoning district that allows residential uses.”
  • Who permits septicLocal

    On-site sewage permitting and health review in Yakima County.

    • The Yakima Health District administers approval and inspection functions; sewer availability and connection requirements may be controlled by the applicable sewer operator.
    “If a septic system is allowed on your property, you will need approval from the Health District before designing or building a new system. [...] Once approved, YHD will issue your Septic System Permit, allowing installation to begin.”
    One more reviewed finding on this topic
    • Local — On-site sewage permitting, review, inspection, and education in Yakima County, administered by the Yakima Health District.
      “If a septic system is allowed on your property, you will need approval from the Health District before designing or building a new system.”
  • Septic permitRequired

    New on-site septic systems in Yakima County where septic is allowed.

    • A site and soil evaluation precedes design.
    • The application must include the on-site sewage permit application, septic design, and application fee.
    • YHD issues the septic system permit after design review and approval.
    • Septic may not be allowed where public sewer is available or within a city utility service area.
    “Once approved, YHD will issue your Septic System Permit, allowing installation to begin.”
    One more reviewed finding on this topic
    • Required — New or replacement on-site sewage systems where septic is allowed.
      “YHD will issue your Septic System Permit”
  • Septic inspectionRequired

    New septic systems and certain existing-system evaluations in Yakima County.

    • Before the system is covered, YHD completes a final inspection.
    • Electrical components require additional verification and the installer must be on site.
    “Before the system is covered, YHD will complete a final inspection to verify that the septic system matches the as-built record.”
  • Off-grid sanitationLimited

    On-site sanitation where public sewer is unavailable or septic is otherwise allowed.

    • Health District approval is required before designing or building a new septic system.
    • Sewer connection may be required within 200 feet when service is available or within a city utility service area.
    “If a septic system is allowed on your property, you will need approval from the Health District before designing or building a new system.”
  • Mandatory utility hookupConditional

    Water and sewer availability for proposed septic development in Yakima County.

    • If within 200 feet of a public sewer line and service is available, or within a city utility service area, connection to sewer may be required instead of septic.
    • Sewer service may be provided by a county, city, or Yakama Nation system.

    sewer-distance threshold: <= 200 feet (service must be available)

    “If your property is within 200 feet of a public sewer line and service is available, or if it is located within a city utility service area, you may be required to connect to sewer instead of installing a septic system.”
    One more reviewed finding on this topic
    • Conditional — Accessory dwelling units in unincorporated Yakima County
      “A: No, the accessory dwelling unit and the primary residence must share the same public water system such as a shared well.”
  • Subdividing landRegulated (with conditions)

    Subdivision and land-division applications in unincorporated Yakima County

    • Applications are reviewed by the Planning Division under Title 19 and related project-administration procedures.
    “Our staff reviews Land Use Applications submitted to the Planning Division as well as assisting citizens, property owners, developers, contractors and consultants with questions pertaining to zoning and subdivision.  On a daily basis the zoning and subdivision planners work to review and write decisions for those land use and subdivision applications.”
    One more reviewed finding on this topic
    • Regulated (with conditions) — Land-use and subdivision applications reviewed by Yakima County Planning Division.
      “On a daily basis the zoning and subdivision planners work to review and write decisions for those land use and subdivision applications.”
  • Driveway accessLimited

    Property access connecting to an adjacent Yakima County right-of-way.

    • A Road Approach Permit is the county process for access between a property and an adjacent County right-of-way.
    • Property owners without adjacent frontage to County right-of-way must seek legal access over neighboring properties to an approved location on County right-of-way.
    • Yakima County provides access recommendations and approvals on a case-by-case basis.
    • Access issues outside County rights-of-way, including city streets or state highways, are handled by the relevant jurisdiction.
    • The Road Approach Permit application identifies a $275.00 fee.
    • After approval of a Road Approach Permit, the applicant may build the road approach according to County standards, personally or through a contracted vendor.

    road approach permit fee: 275 USD

    “Property owners can request a Road Approach Permit that provides access between their property and any adjacent County right-of-way. Property owners without adjacent frontage to County right-of-way must seek legal access over neighboring properties to an approved location on County right-of-way. Yakima County will provide access recommendation and approvals on a case-by-case basis.”
  • Building in a floodplainRequired

    Projects and structures in FEMA-designated floodplain or floodway areas within Yakima County jurisdiction.

    • A separate Flood Hazard Determination is required when the parcel is in a designated FEMA mapped area.
    • Flood Development review is required when the structure is located within the FEMA mapped area.
    • An elevation certificate is required before issuance of the building permit; additional elevation documentation is required during construction, and finished-construction certification applies after specified machinery and grading work is complete.
    • Flood-resistant construction requirements apply to listed development and building work.
    • New or replacement manufactured homes are prohibited in floodways under RCW 86.16.041 and WAC 173-158-070.
    • Certain repairs or improvements to existing farmhouse and substantially damaged residential structures may be considered under the cited WAC provisions.
    “If the structure will be located within the FEMA mapped area, a Flood Development review is also required.”
    One more reviewed finding on this topic
    • Required — Structures located within the 100-year floodplain
      “Flood Hazard Development Permit is required if the structure will be located within the 100 year floodplain, a Flood Development review will be completed by the Plans Examiner during review of your plans.”
  • Permit feesPublished (with conditions)

    Yakima County building, fire-code, grading, manufactured-home, mechanical, plumbing, and miscellaneous permit fees.

    • Fees are updated annually based on the Consumer Price Index and may change.
    • Effective April 1, 2026, Yakima County Building & Fire Safety announced a 3.1% permit-fee increase and implementation of the International Energy Conservation Code permit fee under Yakima County Code 13.24.080.

    permit fee increase: 3.1 percent (effective April 1, 2026)

    “Permit Fees - Building, Fire Code, Grading, Manufactured Home, Mechanical, Plumbing, Miscellaneous”
    One more reviewed finding on this topic
    • Published (with conditions) — Yakima County building and related permit fees
      “Effective April 1, 2026, Yakima County Building & Fire Safety will increase permit fees by 3.1% in accordance with the latest Consumer Price Index (CPI),and will implement the International Energy Conservation Code permit fee in accordance with Yakima County Code 13.24.080.”
  • Permit processPublished (with conditions)

    Yakima County building-permit processing

    • Project Coordinators manage applications for structures, manufactured homes, plumbing and mechanical systems, grading and excavation, fire-code compliance, and demolition.
    • Applications are reviewed by necessary divisions.
    “When you submit an application, Project Coordinators ensure your project is reviewed by the necessary divisions, streamlining the approval process.”

Washington rules that apply here

  • Owner-builder exemptionConditional

    An owner or other person performing construction-related contractor activities on the person's own property or personal residence under Washington contractor-registration law.

    • The exemption concerns registration provisions under chapter 18.27 RCW and does not itself eliminate applicable building, electrical, plumbing, mechanical, land-use, or inspection requirements.
    • For work on the person's own property, the exemption does not apply when the person performs contractor activities for the purpose of selling, demolishing, or leasing the property.
    • For an owner contracting with a registered contractor, the exemption does not apply to a person performing contractor activities to lease or sell improved property owned for less than twelve months.

    small-project contract threshold: < 500 USD (The threshold exemption does not apply when the work is part of a larger operation, contracts are divided to evade the chapter, or the person advertises as a contractor.)

    “The registration provisions of this chapter do not apply to: [...] (12) Any person working on his or her own property, whether occupied by him or her or not, and any person working on his or her personal residence, whether owned by him or her or not but this exemption shall not apply to any person who performs the activities of a contractor on his or her own property for the purpose of selling, demolishing, or leasing the property;”
    2 more reviewed findings on this topic
    • Available (with conditions) — A person working on their own property or personal residence in Washington, including Yakima County.
      “The registration provisions of this chapter do not apply to:”
    • Available (with conditions) — Washington contractor-registration requirements for a person working on their own property or personal residence
      “Any person working on his or her own property, whether occupied by him or her or not, and any person working on his or her personal residence, whether owned by him or her or not but this exemption shall not apply to any person who performs the activities of a contractor on his or her own property for the purpose of selling, demolishing, or leasing the property;”
  • Well permitLimited

    Groundwater wells and groundwater uses statewide under Washington's water-right permit exemption.

    • Domestic use is exempt up to 5,000 gallons per day.
    • Industrial use is exempt up to 5,000 gallons per day.
    • Lawn or garden irrigation is exempt only for a half-acre or less.
    • Stockwater is exempt.
    • Only one permit-exempt use of each type is allowed for any one project, regardless of project size.
    • Withdrawals from multiple wells for one project are aggregated toward the exemption limits.
    • Local governments and other laws and rules may impose additional requirements and limits.
    • Use in excess of the listed amounts, use for other purposes, or use from a surface-water source requires applying for and receiving a water-right permit.
    • Before drilling, a notice of intent must be submitted to Ecology 72 hours before drilling starts; the NOI is not itself a permit or approval to use water.
    • Permit-exempt uses remain subject to state water law, including possible restrictions relating to senior water rights and Streamflow Restoration Act requirements.

    domestic groundwater use exemption: <= 5000 gallons per day (Per project, with withdrawals from multiple wells aggregated.) · industrial groundwater use exemption: <= 5000 gallons per day (Per project, with withdrawals from multiple wells aggregated.) · lawn or garden irrigation exemption: <= 0.5 acre (For lawn or garden irrigation.) · well construction notice: 72 hours before drilling (Notice of intent is not a permit, certificate, or water-right application.)

    “The groundwater permit exemption allows for four small uses of groundwater without a water right permit: Domestic uses of up to 5,000 gallons per day Industrial uses of up to 5,000 gallons per day Irrigation of a lawn or garden, a half-acre or less in size Stockwater”
  • Agricultural exemptionConditional

    Washington contractor-registration exemption for certain construction or operations incidental to farming, dairying, agriculture, viticulture, horticulture, or stock or poultry raising.

    • The exemption does not apply when the work is performed by a registered contractor.
    “(10) Any construction or operation incidental to the construction and repair of irrigation and drainage ditches of regularly constituted irrigation districts or reclamation districts; or to farming, dairying, agriculture, viticulture, horticulture, or stock or poultry raising; or to clearing or other work upon land in rural districts for fire prevention purposes; except when any of the above work is performed by a registered contractor;”
    One more reviewed finding on this topic
    • Available (with conditions) — Temporary growing structures used solely for production of horticultural plants in Washington.
      “The provisions of this chapter do not apply to temporary growing structures used solely for the production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. A temporary growing structure is not considered a building or structure for purposes of this chapter.”
  • Campground & park staysLimited

    Recreational vehicles in the context of Washington's manufactured/mobile-home community statutes

    • The rule defines an RV as temporary and transient living quarters.
    • The RV is not occupied as a primary residence.
    • The RV is not immobilized or permanently affixed to a manufactured/mobile home lot.
    • This claim does not establish general statewide siting permission on private land; local land-use and building rules may apply.
    “(12) "Recreational vehicle" means a travel trailer, motor home, truck camper, or camping trailer that is primarily designed and used as temporary living quarters, is either self-propelled or mounted on or drawn by another vehicle, is transient, is not occupied as a primary residence, and is not immobilized or permanently affixed to a manufactured/mobile home lot.”
    One more reviewed finding on this topic
    • Limited — Camping and temporary occupancy in Washington State Parks facilities
      “The maximum length of stay shall be no more than 10 nights in one park within a 30-day period. Total nights stayed by the same camping party must not exceed 90 nights per calendar year in all state parks. These limitations shall not apply to those individuals who meet the qualifications of WAC 352-32-280 and 352-32-285.”
  • county zoning authorityGeneral

    Washington counties adopting zoning and related official controls for county jurisdiction, including unincorporated areas.

    • A county must create a planning agency as authorized in RCW 36.70.030 and RCW 36.70.040 before engaging in the chapter's planning program.
    • Zoning maps may be adopted only for areas covered by a comprehensive plan containing at least a land use element and a circulation element.
    • Zoning regulations may address land uses, building location and dimensions, yards and open spaces, population density, lot coverage, parking, and minimum gross floor area requirements for single-family detached dwellings.
    • The cited enabling provisions do not state a population threshold, named-county limitation, or special geographic limitation.
    “Any board, by ordinance, may establish classifications, within each of which, specific controls are identified, and which will regulate:”
    One more reviewed finding on this topic
    • General — Washington counties may plan and adopt zoning and other official controls for county land, including unincorporated areas, through their boards and planning agencies.
      “Such official controls may include, but are not limited to, ordinances establishing zoning, subdivision control, platting, and adoption of detailed maps.”
  • county building authorityGeneral

    Washington counties requiring and enforcing building permits and adopting amendments to the state building code for residential construction within county jurisdiction, including unincorporated areas.

    • The state building code must be enforced by counties and cities within their jurisdictional boundaries.
    • A county without a building department must contract with another county, city, or approved inspection agency for enforcement.
    • County amendments may not diminish the minimum performance standards and objectives of the state building code.
    • Residential-building amendments are subject to approval by the state building code council under RCW 19.27.074(1)(b), except as provided by statute.
    • The building-permit definition incorporates exemptions in International Building Code section 105.2 and International Residential Code section R105.2.
    • Counties may adopt permit exemptions for certain specified R-3 or M-1 construction or alteration with total fair market value not exceeding $1,500, but the exemption does not remove substantive code standards.

    permit-exemption fair-market-value ceiling: <= 1500 USD (Applies only to certain construction or alteration of group R, division 3, or group M, division 1 occupancies under RCW 19.27.060(7); substantive code standards still apply.)

    “The state building code required by this chapter shall be enforced by the counties and cities. Any county or city not having a building department shall contract with another county, city, or inspection agency approved by the county or city for enforcement of the state building code within its jurisdictional boundaries.”

Still unanswered

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

  • Short-term rentals — Short-term rentals in Yakima 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 Yakima County

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

Adjudicated — rights fixed

Water rights here have been fixed by a court. New supply effectively means acquiring an existing right.

Household wellExempt up to a limit

RCW 90.44.050 exempts up to 5,000 gpd for domestic use, but the 2018 Streamflow Restoration Act caps NEW permit-exempt domestic wells at 3,000 gpd/connection in some basins and 950 gpd (350 gpd indoor in drought) in others, and new post-2020 wells in the adjudicating Nooksack basin are limited to ~500 gpd indoor.

Limit: 5,000 gpd base (RCW 90.44.050); capped to 3,000 or 950 gpd/connection in streamflow-restoration basins; ~500 gpd indoor for new Nooksack wells

Washington Dept of Ecology — Groundwater permit exemption ↗
  • Yakima River Basin Adjudication (Acquavella)majority of county

    Fully adjudicated, over-appropriated basin (final decree 2019); junior post-1905 users are curtailed/pro-rated in drought and new water-right permits are effectively unavailable; groundwater in hydraulic continuity is subject to adjudicated priorities.

    Washington Dept of Ecology — Yakima Basin adjudication ↗

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 Washington state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Yakima County, Washington

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

Yakima County scores 57/100 on the Bolthole Index, a solid county profile. Its strengths: manageable long-term carry cost. Watch-outs: more administrative friction around building and land use.

Do you need a building permit in Yakima County, Washington?

Yakima County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Yakima Health District (Yakima County on-site sewage 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 Yakima County?

Living in an RV on your own land in Yakima County is allowed on a temporary basis only: Temporary occupancy of a camping or recreational vehicle on a lot in Yakima County's land-use jurisdiction while constructing a permanent dwelling, temporary caregiver housing, or another qualifying temporary use. A Building Official temporary use permit is required. For construction of a permanent dwelling, the dwelling must be on the same lot and the property owner must have an active residential building permit. A tiny home is limited to specific cases. Confirm with the county before relying on it.

How much does land cost in Yakima County, Washington?

Land in Yakima County runs about $2,782 per acre, based on the latest county data.

What is the water situation in Yakima County?

Yakima County gets about 26.4" of rain a year, with severe drought in roughly 11.5% of years. On water rights, Yakima County lies in the Yakima River Basin Adjudication (Acquavella) — Fully adjudicated, over-appropriated basin (final decree 2019); junior post-1905 users are curtailed/pro-rated in drought and new water-right permits are effectively unavailable; groundwater in hydraulic continuity is subject to adjudicated priorities..

How remote is Yakima County?

A representative private-land location has about 159,597 people within a 30-minute drive and 830,155 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Yakima compares in Washington

Compare side-by-side →See all 39 Washington counties ranked →