Bolthole Index

Kittitas County, Washington

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

57Index Score / 100
#19 of 39 in Washington

Unincorporated Kittitas County, Washington generally requires a building permit before construction, placement, alteration or demolition, unless a specific exemption applies1. Community Development Services handles county building applications; county zoning applies on unincorporated land23. Inside Ellensburg, the city sets zoning, while septic permits throughout Kittitas County come from Kittitas County Public Health45. A final building inspection is required before occupancy6.

At a glance

Building permit
Generally required in unincorporated areas; specific exemptions apply1
Zoning
Yes in unincorporated areas; standards vary by district and overlays3
Septic
County site evaluation, design approval, installation permit and final inspection578
RV living
Generally limited to 4 weeks in any 6 weeks; narrow exceptions apply9
Tiny home
Stationary habitable structures need permits; homes on wheels follow RV rules109
Owner-builder
Conditional contractor-registration exemption; permits still apply11
Well
Department of Ecology permit required for a new well12
Driveway access
Public Works approval required for new access or work in county right-of-way13

Who to call

Building permits

Kittitas County Community Development Services

Building permits, inspections, planning and zoning for unincorporated Kittitas County

(509) 962-7506

cds@co.kittitas.wa.us

411 N Ruby ST, Suite 2, Ellensburg WA 98926

Septic permits

Kittitas County Public Health Department — On-site Sewage

Site evaluations, on-site sewage designs, installation permits and final inspections

509-962-7515

environmentalhealth@co.kittitas.wa.us

Roads & driveways

Kittitas County Public Works

County-road access permits and floodplain development questions

509-962-7523

publicworks@co.kittitas.wa.us

411 N Ruby ST, Suite 1, Ellensburg WA 98926

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 Kittitas 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 Kittitas County, Washington?

Yes—unincorporated Kittitas County generally requires a separate permit for each regulated building or structure before construction, placement, alteration, repair, movement, conversion or demolition.1 Certain detached residential accessory structures of 200 square feet or less can be exempt when they are non-habitable and have no plumbing or mechanical systems, but an exempt structure must still meet setbacks and cannot sit in a floodway.1

Kittitas County currently enforces the 2021 I-Codes with Washington State amendments.14 Permitted work ends with a final inspection before occupancy, and a new residence also requires a certificate of occupancy after required inspections and approvals.615 An owner may qualify for Washington's owner-builder contractor-registration exemption when working on their own property, but that exemption does not erase building, electrical, plumbing or septic requirements and does not cover work done to sell, demolish or lease the property.11

Who is the Kittitas County building department?

Kittitas County Community Development Services is the first stop for building permits, inspections, planning and zoning on unincorporated land.2 The office is at 411 N Ruby ST, Suite 2, Ellensburg WA 98926; call (509) 962-7506 or email cds@co.kittitas.wa.us.2 Completed building, planning and Fire Marshal applications and supporting documents can be uploaded through the county website.2

Water availability and a Preliminary Site Analysis must be completed before a building-permit submittal.16 Published review estimates are 2 weeks for foundation-only review, 5 weeks for qualifying fast-track projects and 7 weeks for full review.16 County departments publish separate fee schedules: Community Development Services lists building and planning fees, Public Works lists its application fees, and Public Health lists on-site sewage fees.17 Ask each department for the current total for the project because charges vary by permit type, valuation and review method.17

Does Kittitas County have zoning?

Unincorporated Kittitas County has zoning, with its official map maintained in county GIS; Ellensburg Urban Growth Area projects may also face joint city review and applicable city standards.3 Inside Ellensburg, the city sets zoning; septic systems remain under Kittitas County Public Health.45

Minimum lot size and setbacks depend on the zoning district; residential tables include 15-foot front and 20-foot rear setbacks, with exceptions.1819 Residential height is generally limited to 35 feet, with additional height possible for roofs pitched at least 4:12 and district or overlay exceptions.20

We could not confirm a universal minimum dwelling size; ask Community Development Services about the proposed home.212 Kittitas County recreational dry cabins must have 121–800 square feet of living space, with up to 200 additional square feet of attached garage or accessory area.21 Dry cabins qualify only on remote sites without electrical power, as determined by the Building Official, and use is capped at 90 days annually.21 Construction requires a permit including critical-areas approval, plus an Environmental Health permit for the required privy or composting toilet; factory-assembled structures are excluded.21

How do septic permits work in Kittitas County?

Kittitas County Public Health handles on-site sewage systems countywide; call 509-962-7515 or email environmentalhealth@co.kittitas.wa.us.22 A Public Health environmental health specialist performs the parcel's site evaluation before design and installation permitting.5 A licensed designer must prepare the design, although a homeowner may prepare one after the required pre-design meeting and may install the system.57

The installation permit lasts 1 year, and a 1-year renewal may be available if requested before expiration.7 Public Health must inspect every installed system before final approval, and the drain field cannot be backfilled before that inspection.8 Only about 1.9% of mapped soils are rated without severe limitations for a conventional septic drain field.23 That statistic does not decide an individual parcel, so make the county site evaluation a purchase contingency before committing to a building location.23

Can you live in an RV or tiny home in Kittitas County?

In unincorporated Kittitas County, ordinary RV use is limited to 4 weeks out of any 6 weeks, subject to specified exceptions; the RV must remain licensed and highway-ready and disconnected from utilities when unused.9 RV residence is allowed only under the primary-residence exception for manufactured/mobile-home communities existing before June 8, 2008.9 Park models cannot be placed outside an established manufactured/mobile-home park unless permitted as a Special Care Dwelling, and require government-approved utilities during use.24 Floodplain rules prohibit unattended RVs during flood season, November 15 through Memorial Day, and require road-ready units with quick-disconnect utilities.25

Tiny homes on wheels follow RV restrictions; stationary habitable structures with water or electricity under 200 square feet require building permits and must meet adopted-code room, fixture and life-safety standards.10 Recreational dry cabins may be unheated, but propane- or oil-heated cabins must meet insulation requirements; sleeping lofts need code-compliant egress windows.21 Wildland-Urban Interface requirements apply to dry cabins, with sprinkler exemptions requiring Fire Marshal approval.21

An ADU requires an administrative permit in an applicable zoning district, is limited to one per lot and 1,500 square feet, and cannot be a mobile home or RV.26 County-road, right-of-way and county-parking-lot camping prohibitions address public property, with specified exceptions.27

Building a home in Kittitas County: what are the steps?

  1. Ask Community Development Services to identify the parcel's zoning district, overlays, setbacks and applicable building-permit path.282
  2. Establish water availability; a new well requires a Washington Department of Ecology permit, and the county monitors some wells for sealing, tagging and decommissioning.12
  3. Obtain the Preliminary Site Analysis and complete the county septic site evaluation and design work before requesting an installation permit.167
  4. Apply to Public Works before creating new driveway access or working within a county right-of-way.13
  5. If the site is in a flood hazard area, obtain a flood development permit before work begins.29
  6. Submit the building application and related documents to Community Development Services, then follow the approved plans through required inspections.26
  7. Finish the septic and building inspections before occupancy and obtain the required certificate of occupancy for the new residence.815

What should you check before buying land in Kittitas County?

Start with parcel jurisdiction and zoning: incorporated municipalities may administer their own zoning, while county districts and overlays control standards on unincorporated land.30 Confirm legal access early because Public Works approval is required before new driveway access or work in a county right-of-way.13 A connection on a state-highway right-of-way instead requires written permission from the Washington Department of Transportation.31

Check flood mapping before choosing a building pad because development in an unincorporated flood hazard area requires a permit, and residential construction must be elevated 1 foot above base flood elevation.29 Make septic feasibility a purchase contingency because only about 1.9% of mapped soils are rated without severe limitations for a conventional drain field.23 Confirm the water source as well; a planned new well needs a Department of Ecology permit.12 For a subdivision, utility lines serving and within it generally must be underground unless the county grants a waiver for impracticable site conditions.32

Watch-outs

  • A small structure that is exempt from a building permit must still meet zoning setbacks and cannot be placed in a floodway.1
  • Do not treat the accessory-structure exemption as a tiny-home exemption: a habitable structure with water or electricity under 200 square feet requires a building permit.10
  • Floodplain development needs a separate permit, and unincorporated-county floodplain rules also restrict unattended RVs during flood season.2925
  • Do not backfill a new drain field before Public Health completes the final septic inspection.8
  • County subdivision review can add requirements for access, drainage, sanitation, potable water, utilities and sensitive areas.33

Sources

  1. Kittitas County Code Title 14 — Buildings and Construction, quoted and re-checked
  2. Kittitas County Community Development Services (co.kittitas.wa.us)
  3. Kittitas County Code Title 17 Zoning, quoted and re-checked
  4. Ellensburg: ECC 15.100.010—How to use this code (Kittitas County), quoted and re-checked
  5. Environmental Health Programs - On-site Sewage, quoted and re-checked
  6. Is an inspection required?, quoted and re-checked
  7. Kittitas County Public Health — Liquid Waste, quoted and re-checked
  8. Kittitas County Public Health — Liquid Waste, quoted and re-checked
  9. Kittitas County Code Title 14 — Buildings and Construction, quoted and re-checked
  10. Kittitas County Code Title 14 — Buildings and Construction, quoted and re-checked
  11. RCW 18.27.090 — Exemptions, quoted and re-checked
  12. Kittitas County Public Health — Water, quoted and re-checked
  13. Kittitas County Code Title 12 — Roads and Bridges, quoted and re-checked
  14. Kittitas County Community Development Services — Building, quoted and re-checked
  15. Kittitas County Code Title 14 — Buildings and Construction, quoted and re-checked
  16. Kittitas County Community Development Services — Building, quoted and re-checked
  17. Community Development Services Fees, quoted and re-checked
  18. Kittitas County Code Title 17 — Zoning, quoted and re-checked
  19. Kittitas County Code Title 17 — Zoning, quoted and re-checked
  20. Kittitas County Code Title 17 — Zoning, quoted and re-checked
  21. Title 14 Buildings and Construction, quoted and re-checked
  22. Kittitas County Public Health Department — On-site Sewage (co.kittitas.wa.us)
  23. 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
  24. Code Enforcement Common Issues, quoted and re-checked
  25. Kittitas County Public Works — Floodplain Development Regulations, quoted and re-checked
  26. Kittitas County Code Title 17 — Zoning, quoted and re-checked
  27. Kittitas County Code, quoted and re-checked
  28. Kittitas County Code Title 17 — Zoning, quoted and re-checked
  29. Kittitas County Public Works — Floodplain Development Regulations, quoted and re-checked
  30. Kittitas County Code Title 17 — Zoning, quoted and re-checked
  31. RCW 47.32.150 — Approach roads, other appurtenances—Permit (Washington statewide rule), quoted and re-checked
  32. Kittitas County Code Title 16 — Subdivisions, quoted and re-checked
  33. Kittitas County Code Title 16 — Subdivisions, 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, Kittitas County has countywide zoning.

RuleKittitas CountyYakima CountyChelan CountyGrant CountyDouglas CountyKing CountyPierce County
Building permitRequiredRequiredLimitedRequiredRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Public Health Dept.Yakima Health DistrictChelan-Douglas Health DistrictCounty Health DistrictChelan-Douglas Health DistrictPublic HealthTacoma-Pierce County Health Dept.

County locator

Kittitas County in Washington

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

How Kittitas County scores

Seclusion70100% ev.
Self-Sufficiency52100% ev.
Admin Boringness41100% ev.
Durability34100% ev.
Property Autonomy50100% ev.
Carry Cost70100% 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 →

$499kTypical home
0.7%Property tax
$4,287Land / acre
32.8"Annual rain
12.2% of yrsSevere drought
2.6 / yr (+2.2)Mid-century 100°F days
34.2 daysMid-century dry spell
1.86" (+9.8%)Mid-century 1-day rain
1.22×Wildfire change factor
100%Forward climate coverage
$1,532Home insurance / yr
3.1% / yrInsurance growth
1.32%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
519,751People within 2 hr
36,589Radius comparison (15 mi)
19.8People / sq mi
47.2%Federal land
36.7%Land at 15% slope or less
1.9%Soils rated "not limited" for septic (strict USDA rating)
24,763 acWorkable land screen
49.5%Wooded land
56.3 tonsBiomass / forest ac
45.5°FAvg temp

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Cities and towns in Kittitas 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: Kittitas · Roslyn · Town of South Cle Elum

Answers from the rulebook for Kittitas County

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

Kittitas County rules

  • Building permitRequired

    Buildings and structures regulated by Kittitas County Community Development Services.

    • Separate permits are required for each building or structure unless exempt under KCC 14.04.010.
    • Examples of exemptions include certain detached residential accessory structures of 200 square feet or less that are non-habitable and contain no plumbing or mechanical systems.
    • Exempt structures must still meet applicable setbacks and may not be located in a floodway.
    “Except as specified in KCC 14.04.010 (work exempt from permit), no building or structure shall be erected, placed, constructed, enlarged, altered, repaired, moved, improved, removed, converted or demolished unless a separate permit for each building or structure has first been obtained from Kittitas County Community Development Services.”
  • Building code adoptedAdopted (with conditions)

    Current building-code enforcement by Kittitas County.

    • The county page states that the adopted codes are the 2021 I-Codes with Washington State Amendments.
    • The county continues enforcing currently adopted Washington State codes under RCW 19.27.050.
    “As of March 15, 2024, the current adopted building codes are the 2021 I-Codes with Washington State Amendments.”
  • InspectionsRequired

    Construction requiring a Kittitas County building permit.

    • A final inspection is required after permitted work is complete and before occupancy.
    • Additional inspections may be required by the building official.
    • Access, stormwater, water metering, flood, septic, and well approvals may also be required before final approval.
    “A final inspection shall be made after all work required by the building permit is completed and prior to occupancy.”
  • Certificate of occupancyRequired

    New residences, commercial buildings, and changes in occupancy regulated by Kittitas County.

    • The certificate follows completion of required inspections and approvals.
    • The certificate does not approve violations of county code or other county ordinances.
    “No building or structure shall be used or occupied, and no change in the existing occupancy classification of a building or structure or portion thereof shall be made until the building official has issued a certificate of occupancy therefore as provided herein.”
  • County-wide zoningPresent (with conditions)

    Zoning regulation in unincorporated Kittitas County.

    • Standards vary by zoning district and applicable overlays.
    • Incorporated municipalities may administer separate local zoning rules.
    “The building setback and intensity standards tables address the building setback and intensity of development specific to individual zoning districts.”
  • Local zoningPresent (with conditions)

    Land-use zoning in unincorporated Kittitas County.

    • The county code establishes multiple land-use zones and overlay zones for unincorporated territory.
    • Projects within the Ellensburg Urban Growth Area are jointly reviewed with the associated city and may be subject to applicable city standards under the interlocal agreement.
    • The official zoning map is the County GIS zoning dataset maintained by Community Development Services.
    “The unincorporated territory of Kittitas County is divided into the following land use zone classifications:”
  • Zoning districtsPublished (with conditions)

    Kittitas County zoning districts and their development standards.

    • Standards are district-specific.
    • The code includes residential, commercial, industrial, agricultural, forest and range, urban growth area, airport, and other overlay or special districts.
    “The building setback and intensity standards tables address the building setback and intensity of development specific to individual zoning districts. The zoning district is located on the vertical column and the form/intensity topic being addressed is located on the horizontal row of these tables.”
  • Minimum dwelling sizeSpecified

    Dry cabins used as recreational dwelling units in unincorporated Kittitas County.

    • Dry cabins may be located only in remote areas where electrical power is unavailable and may be used no more than 90 days per year; the Building Official makes the final determination of qualifying locations.
    • A permit, including critical-areas approval, is required before construction proceeds.
    • Usable floor space must be at least 121 square feet and no more than 800 square feet of living area, plus no more than 200 additional square feet of attached garage or accessory-use area.
    • A loft usable for sleeping requires an egress window under the current adopted IRC.
    • Propane- or oil-heated cabins must meet minimum insulation requirements.
    • A privy or composting toilet is required and requires a permit from Kittitas County Environmental Health.
    • Conflicting decisions may be made only under special circumstances by the Building Official.
    • Alternative materials require Building Official approval; factory-assembled structures are excluded.
    • Recreational dry cabins may be unheated.
    • Wildland-Urban Interface requirements apply, except properties may be exempt from sprinklers with Fire Marshal approval; all other applicable WUI requirements remain applicable.

    minimum usable floor space: >= 121 square feet (dry cabins) · maximum living area: <= 800 square feet (dry cabins) · maximum attached garage or accessory-use area: <= 200 square feet (additional area) · maximum recreational use: <= 90 days per year (dry cabins)

    “The usable floor space shall be no less than 121 square feet and no more than 800 square feet of living area”
    One more reviewed finding on this topic
    • Specified — Habitable recreational dry cabins in remote areas of Kittitas County where electrical power is unavailable.
      “Dry cabins may be utilized as recreational dwelling units and may be located only in those remote areas where electrical power is not available. They may be utilized for no more than 90 days per year. [...] The usable floor space shall be no less than 121 square feet and no more than 800 square feet of living area and not more than 200 additional square feet of attached garage or accessory use area.”
  • Minimum lot sizeSpecified

    Lots and dwelling units regulated by Kittitas County zoning.

    • Minimum lot size depends on the applicable residential zone and other health and sanitation requirements.
    “The minimum lot size for all dwelling units shall meet the requirements of the residential zone.”
  • SetbacksSpecified

    Development in Kittitas County zoning districts.

    • Setbacks vary by zoning district and use.
    • Certain exceptions apply, including storefront streets, townhouses, zero-lot-line homes, accessory structures over alleys, and lots of 6,000 square feet or less.

    residential front-yard setback: 15 feet (Applicable residential-zone table and exceptions.) · residential rear-yard setback: 20 feet (Applicable residential-zone table and exceptions.)

    “Minimum front yard setback | 15 ft | 15 ft”
  • Building heightSpecified

    Buildings in Kittitas County zoning districts.

    • Height varies by zoning district.
    • Pitched roofs may receive an additional five feet when the roof slope is at least 4:12.
    • Additional exceptions apply to certain structures and overlays.

    maximum residential building height: 35 feet (Pitched roofs may receive five additional feet if the roof slope is at least 4:12.)

    “For buildings, or portions thereof, with pitched roofs, the maximum height may be increased by five feet. Applicable roof slopes must be at least 4:12 to qualify for this additional height.”
  • Living in an RVLimited

    Recreational vehicles located in the floodplain of unincorporated Kittitas County.

    • During flood season, November 15 through Memorial Day, unattended RVs are not allowed within the floodplain.
    • Throughout the year, RVs in the floodplain must be road-ready, licensed, on wheels or a jacking system, free of permanent attachments or obstructions, and connected with quick-disconnect utilities.

    flood-season start: November 15 · flood-season end: Memorial Day

    “For this reason, during flood season (November 15th to Memorial Day), unattended RVs are not allowed within the floodplain. A RV is considered to be unattended when a notice is placed on the RV and observed there 72 hours later.”
  • Camping on your landLimited

    Temporary camping and overnight vehicle occupancy on county-owned or county-maintained public property, including parks, roads, rights-of-way, trails, and county-owned parking areas.

    • Camping is prohibited on streets, alleys, sidewalks, county roads, county rights-of-way, county-owned parking lots, and other county-owned or county-maintained property unless otherwise provided by the Kittitas County Code or specifically designated.
    • Camping in a park or park facility is excepted when authorized under KCC Chapter 9.50.
    • Vehicle camping in parks, roads, rights-of-way, and county-owned or county-maintained areas is subject to exceptions under ordinance, KCC Chapter 9.50, or KCC Chapter 10.06.
    • The rule addresses public property and does not establish a countywide rule for private land.
    “It is unlawful for any person to camp, occupy camp facilities for purposes of habitation, or use camp paraphernalia in the following areas”
  • Tiny homesLimited

    Habitable tiny homes or other small residential structures in unincorporated Kittitas County that are not treated as recreational vehicles.

    • A structure built for habitable purposes with access to water or electricity and under 200 square feet is a small residential structure.
    • A building permit is required under the International Residential Code and Kittitas County Titles 13 and 14.
    • Structural, fire, life-safety, IRC, HUD, and Washington State requirements also apply.
    • Minimum room sizes, dimensions, and fixtures must comply with the current adopted building code.
    • Small residential structures on wheels are classified as recreational vehicles and are subject to the separate RV restrictions.

    small residential structure threshold: < 200 square feet

    “Every structure built for habitable purposes with access to water or electricity, and which is less than two hundred (200) square feet, shall be considered a "small residential structure" and will require a building permit per standards of International Residential Code and KCC Title 13 and KCC Title 14. [...] Small residential structures on wheels shall be classified as Recreational Vehicles and shall bear the insignia of a state agency, see KCC § 14.04.045.”
    2 more reviewed findings on this topic
    • Limited — Tiny homes on wheels classified as recreational vehicles, park model trailers, and other RV-type units in Kittitas County.
      “An RV may not be used as a residence, except if it is a primary residence and is located in a manufacturer/mobile home community as defined in RCW 59.20.030 that was in existence before June 8, 2008 [...] Except as provided in KCC § 17.92.010, unless an RV is being used as a primary residence pursuant to subsection (8) above, an RV may be used for no more than four (4) weeks out of any six (6) weeks and shall be fully licensed and ready for highway at all times.”
    • Limited — Tiny-home-like units, including park model trailers, RVs, and small residential structures, in unincorporated Kittitas County.
      “A park model trailer may not be placed anywhere within the County, unless it is used as a primary residence [...]”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in applicable Kittitas County zoning districts.

    • Only one ADU is allowed per lot.
    • The ADU may not exceed 1,500 square feet.
    • All zone setbacks apply.
    • Applicable health-department potable-water and sewage-disposal standards apply.
    • Mobile homes and recreational vehicles are not allowed as ADUs.
    • Additional off-street parking is required.
    • The ADU must share the primary dwelling's driveway.
    • An administrative permit is required.

    maximum ADUs per lot: 1 unit · maximum ADU size: <= 1500 square feet

    “Only one ADU shall be allowed per lot; The ADU shall not exceed 1,500 sqare feet; All setback requirements for the zone in which the ADU is located shall apply; The ADU shall meet the applicable health department standards for potable water and sewage disposal, including providing adequate water supplies under RCW 19.27.097; No mobile homes or recreational vehicles shall be allowed as an ADU; The ADU shall provide additional off-street parking; An ADU is not permitted on the same lot where a special care dwelling or an Accessory Living Quarters exists; The ADU must share the same driveway as the primary dwelling; ADUs shall be subject to obtaining an administrative permit.”
  • Who permits septicCounty (with conditions)

    On-site sewage systems in Kittitas County.

    • An OSS installation permit requires a site evaluation on the proposed project parcel.
    • The site evaluation is performed by an Environmental Health Specialist from the Kittitas County Public Health Department.
    • An OSS design must be prepared by a licensed on-site sewage system designer, although homeowners may prepare their own design after a required pre-design meeting.
    • A Kittitas County OSS Installers license is required for septic system installers and septic tank pumpers contracting work in Kittitas County.
    “The site evaluation is performed by an Environmental Health Specialist from the Kittitas County Public Health Department.”
  • Septic permitRequired

    Installation of on-site sewage systems in Kittitas County.

    • A site evaluation and approved OSS design precede the installation permit.
    • The installation permit is valid for one year from issuance.
    • A one-year renewal may be issued if submitted before expiration.
    • Homeowners may install their own OSS system.

    installation permit validity: 1 year (One-year renewal may be issued if the renewal application is submitted before expiration.)

    “When the OSS is ready for installation, the Kittitas County licensed OSS installer or homeowner must request the installation permit through KCPHD either via email or in-person. Once issued, the installation permit is valid for one year from the date of issuance.”
  • Septic inspectionRequired

    Installed OSS systems in Kittitas County.

    • All inspection requirements, including as-built and electrical components when applicable, must be completed before scheduling final inspection.
    • Drain fields may not be backfilled before final inspection.
    “All OSS systems installed must be inspected by an Environmental Health Specialist prior to final approval. All inspection requirements, including as-built and electrical components (if applicable), must be completed prior to scheduling a final inspection. No drain field can be backfilled prior to final inspection.”
  • Mandatory utility hookupConditional

    Utilities serving subdivisions and development in Kittitas County.

    • Subdivision utility lines serving and located within the subdivision must generally be placed underground.
    • The county may waive underground installation where topography, soil, or other conditions make it impracticable and the county engineer recommends waiver based on written evidence from the utility supplier.
    “Utility lines, including, but not limited to electricity, water, natural gas, sewer, telephone and television cable, serving and located within the subdivision, shall be placed underground. Where topography, soil, or other conditions make underground installations impracticable, and the board, upon recommendation from the county engineer, so finds upon written evidence presented by the supplier of such utilities, may waive this requirement for underground utilities.”
  • Subdividing landRegulated (with conditions)

    Subdivision and binding-site-plan review in Kittitas County.

    • Review may impose conditions concerning right-of-way, open space, utilities, access, drainage, sanitation, potable water, sensitive areas, and other public-health or safety concerns.
    • Adequate water-supply requirements apply.
    “The director shall identify, to the extent feasible, conditions likely to be imposed on building permits related to dedication of right-of-way or open space, and tracts, easements or limitations which may be proposed or required for utilities, access, drainage controls, sanitation, potable water supply, protection of sensitive areas or other unique conditions or features which may warrant protection of the public health, safety and welfare.”
  • Driveway accessRequired

    New driveway access and work within Kittitas County rights-of-way.

    • Separate approvals may be required for access controlled by WSDOT, Forest Service roads, irrigation canals, railroads, or other agencies.
    • Residential lots generally have one access point.
    • Additional access requires specified public-benefit and safety findings, or agricultural-use eligibility.
    • The owner is responsible for maintenance.

    minimum side-boundary separation: >= 5 feet (Unless the driveway or road is part of an easement shared with the neighboring property owner.)

    “An approved access permit shall be required from the Department of Public Works prior to creating any new driveway access or performing work within the County right-of-way.”
  • Building in a floodplainRequired

    Development in flood hazard areas of unincorporated Kittitas County.

    • A flood development permit is required before development.
    • Residential structures must be elevated one foot above base flood elevation.
    • Nonresidential structures must be elevated or floodproofed one foot above base flood elevation.
    • Basements are not allowed in the floodplain and utilities must be installed above BFE.

    residential elevation above BFE: 1 foot

    “Prior to beginning any development, landowners must apply for a flood development permit from Kittitas County Public Works or their local jurisdiction.”
  • Permit feesPublished

    Kittitas County Community Development Services, Public Works, and Public Health permit and application fees.

    • Community Development Services publishes 2023 building and planning fee tables and states that unlisted fees may be calculated hourly, by square-foot valuation, or by bid amount.
    • Public Works publishes a fees and application forms page and links Resolution 2025-047, the Public Works Fee Schedule.
    • Public Health publishes a 2026 fee schedule, including onsite sewage system fees.
    • Published schedules may vary by department, permit type, valuation, review method, and applicable fee schedule.

    Community Development Services hourly review and inspection rate: 140 USD/hour (For permit fees not listed, fees may instead be determined by square-foot valuation or bid amount.) · OSS system site evaluation fee: 790 USD (2026 Public Health fee schedule) · OSS gravity system new/repair permit fee: 915 USD (2026 Public Health fee schedule) · OSS pressure system new/repair permit fee: 1220 USD (2026 Public Health fee schedule)

    “OS006 | OSS Gravity System New/Repair Permit | Each | 915”
  • Permit processPublished

    Kittitas County building-permit submission and review process.

    • Completed building, planning, and Fire Marshal applications and related documents may be uploaded.
    • Water availability and Preliminary Site Analysis are required before building-permit submittal.
    • As of the page's 2026-09-21 update, review timelines were 2 weeks for foundation-only, 5 weeks for fast track, and 7 weeks for full review.

    foundation-only review timeline: 2 weeks · fast-track review timeline: 5 weeks (For simpler projects.) · full-review timeline: 7 weeks

    “Updated 9/21/2026: Foundation-Only = 2 weeks Fast Track* = 5 weeks Full Review = 7 weeks”

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;”
    One more reviewed finding on this topic
    • Conditional — Washington contractor-registration exemptions for persons 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;”
  • Manufactured homesLimited

    State statutory limits on county regulation of the placement or use of HUD-standard manufactured homes in Washington; site-specific occupancy remains subject to applicable local and state requirements.

    • The nondiscrimination and equal-siting rule applies to homes built to 42 U.S.C. Sec. 5401-5403 standards, as amended in 2000.
    • Except as provided in RCW 36.01.225(2), a county may require that a manufactured home be new.
    • Except as provided in RCW 36.01.225(2), a county may require a permanent foundation specified by the manufacturer and enclosure of the space from the bottom of the home to the ground with concrete or an approved concrete product, load bearing or decorative.
    • Except as provided in RCW 36.01.225(2), a county may require compliance with local design standards applicable to all other homes in the neighborhood.
    • Except as provided in RCW 36.01.225(2), a county may require thermal equivalence to the state energy code and all other requirements for a designated manufactured home under RCW 35.63.160.
    • A county may not restrict location in a manufactured/mobile home community legally in existence before June 12, 2008, based exclusively on the manufactured/mobile home's age or dimensions.
    • A county may not prohibit siting on an existing lot solely because existing separation and setback requirements regulating distance between homes are unmet.
    • A county may restrict location in a manufactured/mobile home community for other reasons, including failure to comply with fire, safety, other local ordinances, or state laws related to manufactured/mobile homes.
    • The statute does not override legally recorded covenants or deed restrictions of record and does not affect authority granted under chapter 43.22 RCW.

    community legal-existence date for age-or-dimensions protection: 2008-06-12 (Applies to manufactured/mobile home communities legally in existence before this date.)

    “A county may not adopt an ordinance that has the effect, directly or indirectly, of discriminating against consumers' choices in the placement or use of a home in such a manner that is not equally applicable to all homes. Homes built to 42 U.S.C. Sec. 5401-5403 standards (as amended in 2000) must be regulated for the purposes of siting in the same manner as site built homes, factory built homes, or homes built to any other state construction or local design standard.”
  • 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”
    One more reviewed finding on this topic
    • Required — New water wells drilled for property development in Kittitas County.
      “If you are developing property and are planning to drill a well on the property, a permit for the well is required by the Department of Ecology.”
  • Agricultural exemptionAvailable (with conditions)

    Temporary growing structures used solely for production of horticultural plants in Washington.

    • The exemption is limited to temporary growing structures.
    • The structures must be used solely for production of horticultural plants, including ornamental plants, flowers, vegetables, and fruits.
    • The statute states that a temporary growing structure is not considered a building or structure for purposes of chapter 19.27 RCW.
    • This is not a general exemption for residences or all agricultural buildings.
    “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.

  • Lot coverage — Lot coverage limits in Kittitas County zoning districts.
  • Off-grid sanitation — Off-grid sanitation systems in Kittitas County.
  • Short-term rentals — Short-term rentals in Kittitas 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 Kittitas 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 Kittitas County, Washington

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

Kittitas County scores 57/100 on the Bolthole Index, a solid county profile. Its strengths: manageable long-term carry cost and about 36,589 people within 15 miles. Watch-outs: elevated current hazard exposure and more administrative friction around building and land use.

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

Kittitas County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Kittitas County Public Health Department, On-Site Sewage (Liquid Waste) 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 Kittitas County?

Living in an RV on your own land in Kittitas County is limited to specific cases: Recreational vehicles located in the floodplain of unincorporated Kittitas County. During flood season, November 15 through Memorial Day, unattended RVs are not allowed within the floodplain. Throughout the year, RVs in the floodplain must be road-ready, licensed, on wheels or a jacking system, free of permanent attachments or obstructions, and connected with quick-disconnect utilities. A tiny home is limited to specific cases. Confirm with the county before relying on it.

How much does land cost in Kittitas County, Washington?

Land in Kittitas County runs about $4,287 per acre, based on the latest county data.

What is the water situation in Kittitas County?

Kittitas County gets about 32.8" of rain a year, with severe drought in roughly 12.2% of years. On water rights, Kittitas 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 Kittitas County?

A typical private-land location has about 36,589 people within 15 miles and 5,856,927 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

How Kittitas compares in Washington

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