Bolthole Index

Whitman County, Washington

Building permits, zoning and septic rules in Whitman County, Washington

55Index Score / 100
#21 of 39 in Washington

Whitman County, Washington requires building permits for homes on unincorporated land, although projects valued under $800 do not need a building permit and must still meet applicable codes1. County zoning also applies in unincorporated Whitman County2. If a project needs septic, Whitman County Public Health must issue the septic construction permit before the building permit can be issued3.

At a glance

Building permit
Required in unincorporated areas, except projects valued under $8001
Zoning
County Planning administers zoning in unincorporated areas2
Septic system
Whitman County Public Health issues the construction and operational permits43
Owner-builder
Exempt from contractor registration for qualifying work on your own property, but not from permits5
Minimum lot size
No single countywide figure; the septic site evaluation determines it for the site6
Tiny house on wheels
May be built to state code up to 400 sq ft; county siting and permit approval still apply7
RV living
Long-term occupancy on private land is unconfirmed; ask County Planning before buying82
Floodplain
A development permit is required before building in a special flood hazard area of unincorporated Whitman County9

Who to call

Building permits

Whitman County Building Department

Building permits and inspections for all of unincorporated Whitman County; cities in the county run their own building inspection offices

(509) 397-5217

310 N. Main, 2nd Floor, Public Service Building, Colfax, WA 99111

Zoning

Whitman County Planning Division

County zoning, critical area review, land use and floodplain development permits for unincorporated Whitman County

509-397-6206

310 N Main Street, Colfax, WA 99111

Septic permits

Whitman County Public Health, Environmental Health Division

Site evaluations, onsite septic system (OSS) construction and operational permits, and septic professional licensing for Whitman County

(509) 397-6280

eh@whitmancounty.gov

310 N. Main Street, Ste. 108, Colfax, WA 99111

Roads & driveways

Whitman County Department of Public Works

County road, bridge and drainage work, and permitting for new projects on county right-of-way (including driveway/road approaches)

509-397-6206

310 N Main Street, PO Box 430, Colfax, WA 99111

Property records

Whitman County Assessor

Parcel numbers, property records and assessed values for land in Whitman County

509-397-6220

400 N Main Street, Suite 101, Colfax, WA 99111

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

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

Yes. Whitman County requires building permits for projects in unincorporated Whitman County, but projects valued under $800 do not require a building permit and must still comply with applicable codes1. The minimum permit fee is $951. The county's permit materials identify the state building, residential, fire, mechanical, plumbing and energy codes used in its review10. Incorporated cities handle their own building inspections, so first confirm that the parcel is outside city limits11. Building plans are required for all projects except reroofing, residing and similar work1. A temporary growing structure used solely for horticultural plants has a separate statewide building-code exemption, but that is not a general exemption for barns or homes12. Washington's contractor-registration exemption for people working on their own property does not remove the county's permit, code or inspection requirements, so an owner-builder still applies for a building permit5.

Who is the Whitman County building department, and how do you reach them?

The Whitman County Building Department takes permit applications and arranges inspections for projects in unincorporated Whitman County11. The published process starts with a planning inquiry, allows an optional pre-design conference, and then calls for an application with two complete plan sets; payment, plan review and permit issuance follow13. The invoice can include building-permit, planning-review, state and other required planning fees14. Required inspections are identified on the permit card and can include foundation, plumbing, framing, mechanical and final inspections; have the work ready to avoid a reinspection fee15. A permit expires if work does not begin within 180 days or is suspended for 180 days or more11. Inside an incorporated city, contact that city's building office instead11.

Does Whitman County have zoning?

Yes. The Whitman County Planning Division administers zoning for unincorporated land, while incorporated municipalities may apply their own zoning2. Ask Planning to identify the parcel's zoning before assuming a home, tiny house, RV use, setback or land division is allowed; the available county facts do not establish a single countywide answer for those parcel-level questions2. Setbacks depend on the district: residential structures in the Agricultural District must sit at least 100 feet from roads and 20 feet from other boundaries, unless a development buffer requires more16. In the Rural Community Residential and Rural Community Center (RCC-1) districts, dwellings and accessory buildings need 15 feet in front, 10 feet in the rear and 5 feet on the sides, with 15 feet on a side along a flanking street, and the County Planner can reduce some of those under stated conditions1718. The county's Planning Division also handles critical-area review and floodplain development permits19. In unincorporated Whitman County, a development permit must be obtained before construction or development begins within any area of special flood hazard9. Washington floodplain property needs a local floodplain development permit, and local rules may cover a broader area or impose higher standards than federal flood maps alone suggest20. For land served by onsite sewage, the septic site evaluation determines the minimum lot size and whether a system can be installed, so there is no single septic-based minimum acreage that safely applies to every Whitman County parcel6. Short plats, long plats and subdivisions go through the Planning Division, and some of those applications need a Whitman County Public Health sign-off21.

How do septic permits work in Whitman County?

Whitman County Public Health administers onsite sewage systems countywide, including site evaluations, permits and inspections4. Submit the onsite sewage application and complete the site evaluation; after the design is approved and fees are paid, Public Health issues a construction permit3. Published fees are $1,000 for a residential gravity system, $1,100 for a residential alternative system and $300 for an additional or standalone site evaluation14. That construction permit must come before the building permit, so septic feasibility belongs near the start of a home project, not near the end3. Schedule a final septic inspection before covering the system22. After installation and approval, Public Health issues an operational permit, which is also required before a certificate of occupancy can be granted323. The site evaluation determines both whether an onsite system can be installed and the applicable minimum lot size6. Only about 14% of Whitman County soils are rated without severe limits for a conventional drain field, so make an accepted septic design a purchase contingency when possible24. If you buy a property with an existing septic system, a System Assessment Form completed by a licensed evaluator is required before the property transfers25.

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

We could not confirm a Whitman County rule that allows long-term RV living or temporary camping on private land, so ask the Planning Division about the exact parcel and proposed duration before buying2. Washington's manufactured-home-community law describes an RV as temporary living quarters and does not create general permission to occupy one as a primary residence on private land8. Washington does recognize a tiny house on wheels of up to 400 square feet when it is built to the state building code, but foundation, installation, location and local permits still require approval7. Whitman County's specific tiny-home occupancy rules were not confirmed, so take the proposed unit details to both Planning and the Building Department before treating a tiny house as a legal dwelling1911.

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

  1. Ask the Planning Division to confirm zoning, setbacks, critical-area review and any floodplain permit for the parcel219.
  2. If the home will use onsite sewage, obtain Public Health's site evaluation and septic construction permit before the building permit can issue3.
  3. Submit the building application and two complete plan sets, then pay the invoiced building, planning and state fees so review can proceed1314.
  4. Ask Planning whether the project needs a county road permit; a connection on state highway right-of-way instead requires written state permission2627.
  5. Build from the approved plans and request each required inspection when the work is ready15.
  6. Obtain septic approval and its operational permit, then pass the remaining building inspections323.
  7. Whitman County mails a certificate of occupancy when one is needed after all required inspections pass; smaller projects may not require one23.

What to check before you buy land in Whitman County

Septic comes first: only about 14% of Whitman County soils are rated without severe limits for a conventional drain field, and the county's site evaluation determines both system feasibility and the septic-based minimum lot size246. Water also needs an early answer; we could not confirm a countywide utility-connection rule or the well-permit path, so identify the actual water source with Public Health before committing. For access, ask Planning whether the project needs a county road permit; construction on state highway right-of-way needs written state permission2627. Development in a floodplain needs a local floodplain permit, and the Planning Division handles those applications2019. A subdivision or short subdivision must satisfy state law and applicable local controls28. Whitman County's effective property tax rate is about 0.8%, with a median annual bill near $2,566; verify the specific parcel with the Assessor293031.

Watch-outs

  • A septic site evaluation determines the minimum lot size and whether an onsite system can be installed; do not rely on a countywide acreage rule6.
  • We could not confirm a specific Whitman County rule on long-term RV occupancy or temporary camping on private land, so ask the Planning Division directly2.
  • The Whitman County Building Department's jurisdiction is unincorporated county land only; if your parcel is inside a town or city such as Colfax or Pullman, that city's own building office issues the permit instead11.

Sources

  1. Building & Development Division | Whitman County, WA, quoted and re-checked
  2. Planning Division | Whitman County, WA, quoted and re-checked
  3. Onsite Septic | Whitman County, quoted and re-checked
  4. Onsite Septic | Whitman County, quoted and re-checked
  5. RCW 18.27.090: Exemptions, quoted and re-checked
  6. Land Development, quoted and re-checked
  7. Tiny Houses (Washington statewide rule), quoted and re-checked
  8. app.leg.wa.gov (Washington statewide rule), quoted and re-checked
  9. Whitman County Critical Areas Ordinance, quoted and re-checked
  10. Whitman County Building Permit Information, quoted and re-checked
  11. Whitman County Building Department (whitmancounty.gov)
  12. RCW 19.27.065 — Exemption—Temporary growing structures used for production of horticultural plants (Washington statewide rule), quoted and re-checked
  13. Whitman County Building Permit Information, quoted and re-checked
  14. Permit Fees | Whitman County, quoted and re-checked
  15. Whitman County Building Permit Application, quoted and re-checked
  16. Chapter 19.10 - Agricultural District, quoted and re-checked
  17. WCC 19.40.040 - Yard requirements, quoted and re-checked
  18. WCC 19.41.040 - Yard requirements, quoted and re-checked
  19. Whitman County Planning Division (whitmancounty.gov)
  20. Planning & regulation — Washington State Department of Ecology (Washington statewide rule), quoted and re-checked
  21. Planning Division | Whitman County, WA, quoted and re-checked
  22. Onsite Septic, quoted and re-checked
  23. Whitman County Building Permit Information, quoted and re-checked
  24. 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
  25. Onsite Septic, quoted and re-checked
  26. Whitman County Building Permit Information, quoted and re-checked
  27. RCW 47.32.150 — Approach roads, other appurtenances—Permit (Washington statewide rule), quoted and re-checked
  28. RCW 58.17.030 — Subdivisions to comply with chapter, local regulations (Washington statewide rule), quoted and re-checked
  29. Effective property tax rate: Bolthole Index county data
  30. Median property tax bill: Bolthole Index county data
  31. Whitman County Assessor (whitmancounty.gov)

Written October 10, 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, Whitman County has countywide zoning.

RuleWhitman CountyGarfield CountyColumbia CountyAsotin CountyAdams CountySpokane CountyWalla Walla County
Building permitRequiredRequiredRequiredLimitedRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Public HealthCounty Public HealthCounty Public HealthCounty Health DistrictCounty Health Dept.Spokane Regional Health DistrictCounty Dept. of Community Health

County locator

Whitman County in Washington

55
County map
Whitman County highlighted among the Washington counties · colored by Index score

How Whitman County scores

Seclusion79100% ev.
Self-Sufficiency25100% ev.
Admin Boringness41100% ev.
Durability72100% ev.
Property Autonomy50100% ev.
Carry Cost81100% 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 →

$334kTypical home
0.8%Property tax
$2,528Land / acre
17.8"Annual rain
9.1% of yrsSevere drought
9.9 / yr (+7.8)Mid-century 100°F days
30 daysMid-century dry spell
0.73" (+5.3%)Mid-century 1-day rain
1.24×Wildfire change factor
100%Forward climate coverage
$1,347Home insurance / yr
2.6% / yrInsurance growth
1.01%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
597People within 30 min
1,095,805People within 2 hr
5,812Radius comparison (15 mi)
22.2People / sq mi
1.4%Federal land
47.8%Land at 15% slope or less
14.3%Soils rated "not limited" for septic (strict USDA rating)
195,282 acWorkable land screen
2.2%Wooded land
47.2 tonsBiomass / forest ac
49.4°FAvg temp

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Cities and towns in Whitman 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: Town of Albion · Town of Colton · Town of Endicott · Town of Farmington · Town of Garfield · Town of LaCrosse · Town of Lamont · Town of Malden · Town of Oakesdale · Town of Rosalia · Town of St. John · Tekoa

Answers from the rulebook for Whitman County

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

Whitman County rules

  • Building permitRequired

    Building permits for projects in unincorporated Whitman County.

    • Projects with valuations under $800 do not require a building permit but must still comply with applicable codes.
    • Building permits cannot be issued until a septic Construction Permit is issued when the onsite septic process applies.
    • The county building permit information document states that building plans are required for all projects except reroofs, residing, and other similar work.

    minimum permit fee: 95 USD · permit exemption valuation threshold: < 800 USD (The project must still comply with applicable codes.)

    “Minimum permit fee is $95.00. Projects with valuations under $800 do not require a building permit but must still comply with the applicable codes.”
    One more reviewed finding on this topic
    • Limited — Building-permit regulation administered by Whitman County for construction in the unincorporated portions of the county.
      “Minimum permit fee is $95.00. Projects with valuations under $800 do not require a building permit but must still comply with the applicable codes.”
  • Building code adoptedAdopted (with conditions)

    Building work subject to Whitman County building-permit review in unincorporated Whitman County.

    • The permit information lists the 2021 International Building, Residential, Fire, and Mechanical Codes; 2021 Uniform Plumbing Code; 2021 Washington State Energy Code; and Ventilation Indoor Air Quality Code.
    “2021 International Building / Residential Code”
  • InspectionsRequired

    Buildings authorized by a Whitman County building permit.

    • The applicant must call for inspections required in the permit and allow inspection before covering work.
    • Final building inspection must be complete before occupancy.
    “I will call for inspections as required in the permit and will allow inspection(s) before covering any work.”
  • Certificate of occupancyLimited

    Completed permitted projects in unincorporated Whitman County.

    • A certificate is mailed if needed; smaller projects may not require one.
    • For onsite septic, an operational permit must issue before a certificate of occupancy may be granted.
    “smaller projects may not require a Certificate of Occupancy”
  • County-wide zoningPresent (with conditions)

    County zoning administered by Whitman County Planning Division in unincorporated Whitman County.

    • Incorporated cities provide their own building inspections; this county source identifies county zoning but does not establish municipal zoning rules.
    “The Planning Division assists the public with zoning, critical area reviews and other inquiries.”
  • Minimum lot sizeSpecified

    Minimum lot size as determined through Whitman County Public Health site evaluation for onsite sewage and land-development review.

    • The applicable minimum depends on site evaluation results and OSS installation options.
    • This is not a single countywide numeric lot-size value.
    “The results of the Site Evaluation determines the minimum lot size, and if an OSS can be installed at the location.”
  • SetbacksSpecified

    Residential structures in the Agricultural District's rural residential use provisions.

    • The minimum setback from roads is 100 feet.
    • The minimum setbacks on all other sides are 20 feet, except where the development buffer requires a greater distance.

    road setback: 100 ft · other-side setback: 20 ft (A greater distance applies where required by the development buffer.)

    “For all residential structures the minimum setback from roads shall be 100 feet and the minimum setbacks on all other sides of the residence shall be twenty (20) feet except where the development buffer requires a greater distance.”
    2 more reviewed findings on this topic
    • Specified — Dwellings and accessory buildings in the Rural Community Residential District.
      “Setback required: the minimum setback for dwellings and accessory buildings from property boundaries shall be 15 ft. for front yards, 10 feet for rear yards and 5 ft. for side yards, except 15 ft. for side yards along flanking street or corner lot. The front yard setback for both residences and accessory buildings can be reduced administratively by the County Planner to as low as zero feet if the front yard contains no parking space and with approval of the governing road district. The County Planner may approve a rear yard setback reduction to as low as zero feet for residences and accessory buildings if there is no objection from the adjacent landowner(s).”
    • Specified — Dwellings and accessory buildings in the Rural Community Center District (RCC-1).
      “Setback required: the minimum setback for dwellings and accessory buildings from property boundaries shall be 15 ft. for front yards, 10 feet for rear yards and 5 ft. for side yards, except 15 ft. for side yards along flanking street or corner lot. The front yard setback for both residences and accessory buildings can be reduced administratively by the County Planner to as low as zero feet if the front yard contains no parking space and with approval of the governing road district. The County Planner may approve a rear yard setback reduction to as low as zero feet for residences and accessory buildings if there is no objection from the adjacent landowner(s). (Revised 3/31/14 Ordinance #075323)”
  • Who permits septicCounty (with conditions)

    Onsite septic systems in Whitman County.

    • County public-health staff schedule site evaluations and administer the OSS permitting process.
    “Submit the Site Evaluation Application (linked below). An WCPH Environmental Health Specialist will contact you to schedule a site evaluation.”
  • Septic permitRequired

    New onsite septic-system construction in Whitman County.

    • Submit an OSS Permit Application.
    • A construction permit issues only after design approval and payment of all fees.
    • Building permits cannot issue until the construction permit issues.
    “Submit the OSS Permit Application. Setback Requirements may be a helpful resource. Once the design is approved and all fees are paid, a Construction Permit will be issued. Building permits cannot be issued until a Construction Permit is issued.”
  • Septic inspectionRequired

    Onsite septic system design, installation, and completion in Whitman County.

    • An OSS Permit Application must be submitted.
    • A Construction Permit is issued only after design approval and payment of all fees.
    • Building permits cannot be issued until a Construction Permit is issued.
    • A final inspection must be scheduled before covering the system.
    • The page states that contracting with Licensed OSS Professionals is required if required for the project.
    “Once the design is approved and all fees are paid, a Construction Permit will be issued. Building permits cannot be issued until a Construction Permit is issued. Schedule a final inspection before covering the system.”
    One more reviewed finding on this topic
    • Required — Property transfers involving an existing septic system in Whitman County.
      “A System Assessment Form (linked below) completed by a Licensed Evaluator is required prior to property transfer.”
  • Subdividing landRegulated (with conditions)

    Short plats, long plats, and subdivisions administered by Whitman County Planning.

    • Public-health land-development review may be required for short plats.
    • Where an existing OSS is failing, it must be repaired before further development.
    “Applications from Whitman County Building and Planning Division that may require Whitman County Public Health to sign off include building permits, Rural Housing Certificates and short plats. Depending on the presence or absence of an OSS, the review process will look different.”
  • Driveway accessLimited

    Projects seeking a Whitman County building permit in unincorporated Whitman County.

    • Applicants must inquire with Planning to determine whether a road permit is needed; the source does not establish that every driveway requires a road permit.
    “Inquiry with the Planning Department to determine zoning, setbacks, protected land requirements, and if a road permit is needed. There could be Planning Department fees depending on the nature of the project and it’s location.”
  • Building in a floodplainRequired

    Construction or development within areas of special flood hazard in unincorporated Whitman County.

    • The rule applies to all areas of special flood hazards within unincorporated Whitman County.
    • A development permit is required before construction or development begins.
    • The permit covers all structures, including mobile homes, and all other development, including fill and other activities.
    • A floodplain evaluation is required for routine maintenance of drainages for flood-control and tiling-maintenance purposes.
    • Applications may require scaled plans showing the nature, location, dimensions, elevations, structures, fill, storage of materials, drainage facilities, and related locations.
    “A development permit shall be obtained before construction or development begins within any area of special flood hazard.”
  • Permit feesPublished (with conditions)

    Published Whitman County Public Health onsite-sewage and land-development fees.

    • Fees shown are specific to the listed permit or review type.
    • The building-permit information says building invoices include building-permit, planning-review, state, and any additional required planning fees.

    residential gravity OSS permit: 1000 USD · residential alternative OSS permit: 1100 USD · commercial gravity/alternative review: 1200 USD · site evaluation (additional/standalone): 300 USD · new land-use/planning review: per 400 USD (per individual site)

    “Residential Gravity | $1000 Residential Alternative | $1100 Commercial Gravity/Alternative Review | $1200 [...] Site Evaluation (additional/standalone) | $300 [...] New Review | $400 per individual site”
  • Permit processPublished (with conditions)

    Whitman County building-permit process in unincorporated areas.

    • The process begins with a Planning Department inquiry about zoning, setbacks, protected-land requirements, and possible road permits.
    • Applicants submit the application and two sets of plans.
    • The county generates an invoice including building, planning-review, state, and additional planning fees; payment is required before further review.
    • Plans are reviewed for code compliance; corrections may be requested.
    • Inspections must be called in as needed, and a final inspection is required after all required inspections pass.
    “Submit Building Permit Application Form & TWO sets of plans.”

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 requirements for work by a person on their own property or personal residence.
      “(12) Any person working on his or her own property, whether occupied by him or her or not”
  • Minimum dwelling sizeSpecified

    Dwelling units regulated by Washington's state building code.

    • The rule specifies habitable-space and room-area minimums, not a zoning minimum lot or gross floor-area standard.
    • Kitchens are expressly excepted from the minimum floor-area requirement.
    • Efficiency dwelling units must comply with Sections 1208.1 through 1208.4 and must have a separate closet, required kitchen facilities, light and ventilation, and a separate bathroom as stated in the source.
    • The current rule text states WSR 23-23-102 was filed 11/15/23 and effective 3/16/24.

    minimum habitable space: >= 190 square feet · minimum area of at least one room: >= 120 square feet · minimum net floor area of sleeping units and other habitable rooms: >= 70 square feet (Kitchens are not required to be of a minimum floor area.)

    “1208.3 Dwelling unit size. Dwelling units shall have a minimum of 190 square feet (17.7 m 2) of habitable space. 1208.4 Room area. Every dwelling unit shall have not less than one room that shall have not less than 120 square feet (11.2 m 2) of net floor area. Sleeping units and other habitable rooms of a dwelling unit shall have a net floor area of not less than 70 square feet (6.5 m 2). EXCEPTION: Kitchens are not required to be of a minimum floor area.”
  • Building heightSpecified

    Buildings subject to Washington's state building code, with allowable height determined by occupancy classification and type of construction.

    • Table 504.3 is occupancy- and construction-type-specific.
    • The source states that Chapters 4 and 5 contain specific exceptions to the allowable height.
    • The table includes NS and UL entries; the source footnotes state that NS is only for evaluation of existing building height under the International Existing Building Code and that other entries have sprinkler-related conditions.

    allowable building height: occupancy-classification and construction-type specific values in Table 504.3 feet above grade plane (See Chapters 4 and 5 for specific exceptions.)

    “Allowable Building Height in Feet Above Grade Plane”
  • Tiny homesAllowed (with conditions)

    Occupancy and placement of tiny houses in Washington

    • A tiny house may be built on wheels and may not exceed 400 square feet including kitchen, bathroom, and sleeping/living area.
    • It must be built to the Washington State Building Code.
    • Approval depends on where it is built; local building-department requirements and permits apply to foundation, installation, and location.
    • A wheeled structure that is not a tiny house as described may instead be a recreational vehicle or park model.
    • A manufactured home, including a tiny manufactured home, requires consultation with the local building department regarding where it may be located.

    maximum area: <= 400 square feet

    “A tiny house is a dwelling that may be built on wheels and is no larger than 400 square feet, including a kitchen, bathroom, and sleeping/living area, and must be built to the Washington State Building Code. The approval process for a tiny house depends on where it's built.”
  • 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.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in portions of Washington cities, towns, and counties located within designated urban growth areas and subject to the Growth Management Act requirements

    • Cities and counties planning under the chapter must adopt or amend ordinances and development, zoning, and other official controls to implement the statutory requirements.
    • The requirements apply only in portions of towns, cities, and counties within designated urban growth areas.
    • Local governments may still apply public-health, safety, building-code, environmental-permitting, on-site-wastewater, and generally applicable development regulations.
    • Local governments may restrict or prohibit ADUs where development is restricted because of on-site sewage infrastructure, critical areas, or other unsuitable physical characteristics.
    • Under RCW 36.70A.681, at least two ADUs must be allowed on qualifying lots in configurations specified by statute, subject to listed exceptions and limitations.
    • The statutory requirements do not apply to lots designated with critical areas or buffers, or to specified impaired or threatened potable-water-reservoir watersheds.

    minimum ADUs in qualifying configurations: >= 2 accessory dwelling units per qualifying lot (Applies to lots in all zoning districts within an urban growth area that allow single-family homes, subject to statutory exceptions.)

    “The city or county must allow at least two accessory dwelling units on all lots that are located in all zoning districts within an urban growth area that allow for single-family homes in the following configurations:”
  • 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”
  • Mandatory utility hookupConditional

    Existing OSS failures and certain new developments statewide when public sewer service and applicable local requirements exist.

    • For an existing OSS failure within a sewer utility service area, the local health officer must require public-sewer connection if the sewer utility allows connection and adequate service is available within 200 feet measured along the usual or most feasible access route.
    • For an OSS repaired under Table X, connection is required when the local health officer deems it necessary to protect public health, adequate public sewer becomes available within 200 feet under the stated measurement rule, and the sewer utility allows connection.
    • Local boards of health may require new development to connect to protect public health.
    • Local boards of health shall require connection for new development or a development with a failing OSS when required by the comprehensive land use plan or development regulations.
    • The rule was filed March 1, 2024, and became effective April 1, 2025.

    public sewer availability distance: <= 200 feet (Measured from the existing building-drain/building-sewer connection, or where no building drain exists, from where the sewer line begins, along the usual or most feasible route of access.)

    “(b) Require connection to a public sewer system if the sewer utility allows the connection and has adequate public sewer services available within 200 feet from where the existing building drain connects to the existing building sewer, or where no building drain exists, within 200 feet from where the sewer line begins, as measured along the usual or most feasible route of access.”
  • 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.

  • Local zoning — Local zoning across incorporated municipalities and other subordinate jurisdictions within Whitman County.
  • Zoning districts — Published Whitman County zoning-district schedule.
  • Lot coverage — Lot coverage in Whitman County zoning districts.
  • Living in an RV — RV occupancy on private land in unincorporated Whitman County.
  • Camping on your land — Temporary camping on private land in unincorporated Whitman County.
2 more unanswered
  • Off-grid sanitation
  • Short-term rentals

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.

Living off-grid in Whitman County, Washington

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

Whitman County scores 55/100 on the Bolthole Index, a solid county profile. Its strengths: manageable long-term carry cost and sparse surroundings — about 597 people within a 30-minute drive. Watch-outs: thin water margin (17.8″/yr rainfall) and more administrative friction around building and land use.

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

Whitman County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Whitman County Public Health, Environmental Health Division. 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.

How much does land cost in Whitman County, Washington?

Land in Whitman County runs about $2,528 per acre, based on the latest county data.

What is the water situation in Whitman County?

Whitman County gets about 17.8" of rain a year, with severe drought in roughly 9.1% of years.

How remote is Whitman County?

A representative private-land location has about 597 people within a 30-minute drive and 1,095,805 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 Whitman compares in Washington

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