Bolthole Index

Ferry County, Washington

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

64Index Score / 100
#7 of 39 in Washington

Ferry County, Washington requires a building permit for new construction and inspections before permit-required work is concealed or occupied12. Unincorporated Ferry County has no conventional zoning that limits what may be built, but minimum lot sizes, subdivision rules, density limits, resource-land designations and the Curlew Lake rules still apply34. Septic permits go through the Northeast Tri County Health District's Ferry County office in Republic56.

At a glance

Building permit
Required for new construction, enforced under Ferry County's Building Ordinance 2022-02 and the Washington State Building and Energy Codes1
Zoning
No conventional use-district zoning limiting what you build, but the county enforces minimum lot sizes and caps density at 1 home per 2.5 acres on larger residential lots378
Septic
Permitted through the Northeast Tri County Health District's Ferry County office; the application fee is $688 and an installation permit lasts three years69
Floodplain
A county Flood Damage Prevention Ordinance requires a development permit before construction in a mapped special flood hazard area, administered by the Planning Director10
Minimum lot size
As small as 12,500 sq ft with community water and sewer, up to 2.5 acres with individual water and septic; the Curlew Lake shoreline area has its own stricter sub-area plan11
RV / tiny home living
A tiny house up to 400 sq ft must meet the state building code and get local siting approval; long-term RV occupancy on private land isn't directly addressed by any official source found1213
Owner-builder
Working on your own property exempts you from Washington contractor registration, but building permits and licensed trades for electrical, plumbing and mechanical work still apply14
Construction design standards
40 psf minimum roof snow load countywide (55 psf suggested above 3,000 ft elevation), 110 mph basic wind speed, and a 30-inch minimum frost depth for footings15

Who to call

Building permits

Ferry County Building Department

Building permit applications, plan review and inspections for new construction, out-buildings, mobile homes, and plumbing/mechanical work in Ferry County; also posts the county's construction design-data standards (snow load, wind, frost depth)

(509) 775-5225

[email protected]

350 East Delaware Ave, Republic, WA 99166

Zoning

Ferry County Planning Department

Minimum lot size, residential density, Curlew Lake sub-area plan, and agriculture/forest land-of-long-term-significance designation questions for Ferry County

(509) 775-5225 ext 3101

Septic permits

Northeast Tri County Health District – Ferry County (Republic) Office

Onsite sewage (septic) system permits, site evaluations and inspections for Ferry County

509-775-3111

147 N Clark, Suite 1, Republic, WA 99166

Roads & driveways

Ferry County Public Works

County road maintenance and road-approach (driveway) permit applications for connections to Ferry County roads

(509) 775-5225 ext. 2507

[email protected]

350 E Delaware Ave. #8, Republic, WA 99166

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

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

Yes. Ferry County provides separate permit packages for homes, mobile homes, outbuildings, commercial projects, and plumbing and mechanical work16. Permit-required residential work must remain visible and accessible for inspection until approved, and a final inspection is required before occupancy2. Washington counties may adopt a narrow permit exemption for qualifying small projects, but it does not cover electrical, plumbing or mechanical work or waive the applicable code standards17. An owner may work on their own property without contractor registration unless the work is done to sell, demolish or lease the property; that exemption does not waive building, trade or septic permits14.

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

The Building Department handles permit applications, plan review and inspections for new construction, out-buildings, mobile homes, and plumbing and mechanical work15. The same office's design-data sheet is where you'll find Ferry County's actual construction standards: a minimum roof snow load of 40 psf countywide, higher at elevation, a 110 mph basic wind speed, and a 30-inch minimum frost depth for footings15. Flood-hazard questions get routed to the Planning Department rather than the Building Department; the Planning Director administers Ferry County's own Flood Damage Prevention Ordinance, which requires a development permit before construction or development begins in a mapped special flood hazard area810. Planning is also the office to call about minimum lot sizes, density and Ferry County's agriculture and forest land designations8. Septic isn't a county office at all: it's the Northeast Tri County Health District's Ferry County office in Republic, separate from the courthouse departments65. For a driveway or road approach onto a county road, Public Works has its own application and requires county-board permission before you build one1819.

Does Ferry County have zoning?

Unincorporated Ferry County has no conventional county zoning that limits what may be built, but development regulations, resource-land designations, shoreline rules, subdivision rules, flood regulations and building regulations still apply3. For a new subdivision, the minimum lot is 12,500 square feet with community water and sewer, one acre with community water and individual sewer, or 2.5 acres with individual water and sewer11. Curlew Lake has additional shoreline restrictions, while designated agriculture and forest lands have their own density and parcel-division controls420. Designated Agriculture Land of Long-Term Commercial Significance generally cannot be divided below 20 acres and is limited to one home per 20 acres, subject to stated exceptions for extended family and full-time farm employees21. Ask the Planning Department which overlays and designation apply to the parcel before relying on the county's lack of conventional zoning8.

How do septic permits work in Ferry County?

Septic in Ferry County goes through the Northeast Tri County Health District's Republic office, not the county Building Department56. Submit the application, $688 fee, proof of ownership, site plan, directions and completed county Planning Office site analysis; NETCHD then reviews the site and design before issuing an installation permit229. A septic application remains valid for two years, while the installation permit lasts three years from issuance22. NETCHD must inspect the installed system before it is covered, and the office requires at least 48 hours' notice for the final inspection; corrections can trigger a $103 reinspection fee23. Only 7.2% of Ferry County land is rated free of severe limitations for a conventional drain field, so complete the site and soil work before committing to a house location24.

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

Tiny homes have a defined statewide path: a tiny house built on wheels can be up to 400 square feet including kitchen, bathroom and sleeping area, but it still has to be built to the Washington State Building Code, and approval depends on where it's sited — meaning Ferry County's Building Department still reviews the foundation, installation and location1215. RV occupancy on private land is murkier: Washington law defines a recreational vehicle as temporary, transient living quarters not occupied as a primary residence, which is a definition, not a green light to live in one on your own parcel long-term25. No official Ferry County source reviewed for this guide directly addresses long-term RV living on private land, so call the Planning Department before you plan around an assumption138. Ferry County's density cap still applies to any occupied dwelling on a residential lot over 2.5 acres — no more than one single-family dwelling unit per 2.5 acres — whatever form that dwelling takes8.

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

  1. Ask the Planning Department to confirm the parcel's minimum lot size, density, Curlew Lake rules, and any agriculture or forest designation48.
  2. Complete the residential permit package from the Building Department and design for the posted snow, wind and frost standards1615.
  3. If the site is in a mapped special flood hazard area, obtain a floodplain development permit from Planning before work begins10.
  4. Submit the septic application, fee, ownership proof, site plan, directions and completed Planning Office site analysis to NETCHD; obtain design approval and the installation permit before installing the system229.
  5. Keep permit-required building work visible for inspection, arrange the required final building inspection, and give NETCHD at least 48 hours' notice before the septic final inspection223.
  6. If the driveway connects to a county road, obtain county-board permission through Public Works; a state-highway connection requires a separate WSDOT permit181926.

What to check before you buy land in Ferry County

Septic soils are the headline concern: only 7.2% of Ferry County's land is free of severe limitations for a conventional drain field, so a site and soil evaluation belongs early in your due diligence, before you're committed to a parcel24. The terrain is demanding too — just 28.7% of the land sits at 15% slope or less, and 75.4% is forested, so expect real grading, access and clearing costs on a typical parcel2728. Water is less of a worry: annual precipitation runs about 20.5 inches a year, with severe drought in only 8.4% of years2930. Confirm your parcel's minimum lot size, density limit, and whether it carries an Agriculture or Forest Land of Long-Term Significance designation before you buy, since any of those can cap what you're allowed to build regardless of the parcel's total acreage8. Property taxes run low: an effective rate near 0.7%, with a median bill around $1,792 a year against a typical home value of about $287,337313233.

Watch-outs

  • Unincorporated Ferry County has no conventional zoning that limits what you build, but subdivision, shoreline, resource-land, flood and building regulations still apply; confirm the parcel's designation with the Planning Department38.
  • No official source reviewed for this guide directly addresses long-term RV living on private land in Ferry County; Washington's statutory definition of an RV concerns temporary, transient use, not a right to live in one on your own parcel25.
  • On designated agricultural land, a nonagricultural accessory use may not convert more than one acre and must support rather than interfere with the agricultural use34.

Sources

  1. Ferry County Building Department (2026 county census)
  2. WAC 51-11R-10500 Inspections, quoted and re-checked
  3. Ferry County Zoning & Lot Size FAQs, quoted and re-checked
  4. Ferry County Zoning & Lot Size FAQs, quoted and re-checked
  5. Northeast Tri County Health District - Septic Permit Applications (2026 county census)
  6. Northeast Tri County Health District – Ferry County (Republic) Office (netchd.org)
  7. Ferry County Zoning & Lot Size FAQs, quoted and re-checked
  8. Ferry County Planning Department (cms5.revize.com)
  9. On-Site Sewage Permit Application, quoted and re-checked
  10. Building Department, quoted and re-checked
  11. Ferry County Zoning & Lot Size FAQs, quoted and re-checked
  12. Tiny Houses (Washington statewide rule), quoted and re-checked
  13. Ferry County Zoning & Lot Size FAQs (2026 county census)
  14. RCW 18.27.090 Exemptions, quoted and re-checked
  15. Ferry County Building Department (ferry-county.com)
  16. Building Department, quoted and re-checked
  17. WAC 51-16-080 — Permit exemptions guideline (Washington statewide rule), quoted and re-checked
  18. Ferry County Public Works (ferry-county.com)
  19. RCW 36.75.130 — Approaches to county roads—Rules regarding construction—Penalty (Washington statewide rule), quoted and re-checked
  20. Ferry County Zoning & Lot Size FAQs, quoted and re-checked
  21. Ferry County Zoning & Lot Size FAQs, quoted and re-checked
  22. On-Site Sewage Permit Application, quoted and re-checked
  23. On-Site Sewage Permit Application, quoted and re-checked
  24. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  25. RCW 59.30.020 — Definitions (Washington statewide rule), quoted and re-checked
  26. RCW 47.32.150 — Approach roads, other appurtenances—Permit (Washington statewide rule), quoted and re-checked
  27. Share of land at 15% slope or less: Bolthole Index county data
  28. Wooded share of land: Bolthole Index county data
  29. Annual precipitation: Bolthole Index county data
  30. Share of years in severe drought: Bolthole Index county data
  31. Effective property tax rate: Bolthole Index county data
  32. Median property tax bill: Bolthole Index county data
  33. Typical home value (Zillow): Bolthole Index county data
  34. Ferry County Development Regulations Ordinance 2024-02, quoted and re-checked

Written September 29, 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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County locator

Ferry County in Washington

64
County map
Ferry County highlighted among the Washington counties · colored by Index score

How Ferry County scores

Seclusion92100% ev.
Self-Sufficiency48100% ev.
Admin Boringness42100% ev.
Durability44100% 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 →

$287kTypical home
0.7%Property tax
$929Land / acre
20.5"Annual rain
8.4% of yrsSevere drought
2.4 / yr (+2.1)Mid-century 100°F days
25.7 daysMid-century dry spell
0.84" (+8.9%)Mid-century 1-day rain
1.37×Wildfire change factor
100%Forward climate coverage
$1,433Home insurance / yr
1.1% / yrInsurance growth
2.06%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
3,794People within 30 min
80,584People within 2 hr
4,420Radius comparison (15 mi)
3.4People / sq mi
34.9%Federal land
28.7%Land at 15% slope or less
7.2%Septic soil without severe limits
100,776 acWorkable land screen
75.4%Wooded land
44.4 tonsBiomass / forest ac
43.2°FAvg temp

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Answers from the rulebook for Ferry County

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

Ferry County rules

  • County-wide zoningPresent (with conditions)

    County development regulations and land-use designations in Ferry County.

    • The county FAQ states that conventional zoning does not limit what can be built, but minimum property sizes, density limits, Curlew Lake rules, and agricultural/forest land designations apply.
    “NO and Yes. No, Ferry County does not have zoning in the aspect that would limit what you can build. BUT, Ferry County does have minimum property sizes.”
    One more reviewed finding on this topic
    • Absent (with conditions) — Conventional county zoning that limits what may be built in unincorporated Ferry County.
      “NO and Yes. No, Ferry County does not have zoning in the aspect that would limit what you can build. BUT, Ferry County does have minimum property sizes.”
  • Zoning districtsPartial

    County land-use controls in Ferry County, including designated agricultural and forest lands and the Curlew Lake Shoreline Area

    • The county FAQ says Ferry County does not have zoning in the aspect that would limit what can be built, but it also identifies minimum property sizes and other zoning-type restrictions.
    • Curlew Lake development is subject to the Curlew Lake Sub Area Plan and other applicable regulations.
    • Agriculture and Forest Land of Long-Term Commercial Significance have classification-based density and parcel-division controls.
    • This source does not establish that conventional zoning districts are published.
    “NO and Yes. No, Ferry County does not have zoning in the aspect that would limit what you can build. BUT, Ferry County does have minimum property sizes.”
  • Minimum lot sizeSpecified

    New subdivisions and designated areas in Ferry County

    • A new subdivision is subject to the listed minimum lot sizes.
    • Additional Curlew Lake Shoreline Area restrictions apply.
    • Agriculture Land of Long-Term Commercial Significance may not be divided into parcels less than 20 acres and is limited to no more than one residential unit per 20 acres, except for stated extended-family or full-time-farm-employee residences.
    • Forest Land of Long-Term Commercial Significance has additional class-specific acreage and density rules, including 20-acre, 10-acre, and other stated thresholds.

    community water and community sewer: 12500 square feet (new subdivision residential lot) · community water and individual sewer: 1 acre (new subdivision lot) · individual water and individual sewer: 2.5 acres (new subdivision lot) · agriculture land parcel minimum: >= 20 acres (designated Agriculture Land of Long-Term Commercial Significance)

    “A new subdivision of land is limited to the following minimum lot sizes: o 12,500 square feet for a residential lot that is to be served by community water and community sewer systems. o One acre for a lot to be served by community water and individual sewer system. o 2.5 acres for a lot to be served by individual water supply and individual sewer system.”
    One more reviewed finding on this topic
    • Specified — New subdivisions and designated areas in unincorporated Ferry County.
      “A new subdivision of land is limited to the following minimum lot sizes:”
  • Who permits septicLocal

    On-site sewage systems in Ferry County within the Northeast Tri County Health District jurisdiction.

    • The Health District has authority for systems with design flows up to 3,499 gallons per day; Washington agencies retain authority for larger or specially transferred systems.

    maximum design flow: <= 3499 gallons per day (Northeast Tri County Health District authority)

    “The Northeast Tri-County Health District has authority and approval over: (a) Systems with design flows through any common point up to 3,499 gallons per day; (b) Any Large On-Site Sewage System “LOSS” for which jurisdiction has been transferred to the Northeast Tri-County Health District from the Department of Health by contract.”
  • Septic permitRequired

    Installation of on-site sewage systems in Ferry County.

    • A sewage-system design must be submitted and approved before the installation permit is issued.
    • Installation permits are valid for three years from issuance.
    • The Health District must be notified before installation is covered.

    permit validity: 3 years (from date of issuance)

    “If the design is approved, an installation permit will be issued. Permits are valid three years from the date of issuance.”
    One more reviewed finding on this topic
    • Required — Installation of an on-site sewage system in Ferry County.
      “A sewage system design must be submitted to the Health District and approved before a permit is issued – see Step 3).”
  • Septic inspectionRequired

    Final inspection of installed on-site sewage systems in Ferry County.

    • The system must be inspected before being covered.
    • At least 48 hours’ notice is required to schedule the final inspection.
    • A reinspection and fee may be required if deficiencies are found.

    inspection notice: >= 48 hours (minimum notice for final inspection)

    “A minimum 48-hour notice is required to schedule a final inspection.”
    One more reviewed finding on this topic
    • Required — On-site sewage system installation in Ferry County.
      “Upon completion of the on-site system installation and before the system is covered, the Health District must be notified that the system is ready for inspection and the installer must submit an acceptable As-Built Drawing.”
  • Agricultural exemptionConditional

    Agricultural accessory uses and activities on designated Agricultural Lands of Long-Term Commercial Significance.

    • Accessory uses must be located, designed, and operated so they do not interfere with and support continuation of the overall agricultural use.
    • Non-agricultural accessory uses must be consistent with the size, scale, and intensity of the existing agricultural use and may not convert more than one acre of agricultural land to non-agricultural uses.

    maximum conversion for non-agricultural accessory uses: <= 1 acre

    “Non-agricultural accessory uses and activities will be allowed as long as the uses and activities are consistent with the size, scale and intensity of the existing agricultural use of the property. Non-agricultural accessory uses shall not convert more than one acre of agricultural land to non-agricultural uses.”
  • Subdividing landRegulated (with conditions)

    New subdivisions in Ferry County

    • Minimum lot sizes depend on water and sewer service.
    • Additional restrictions apply to the Curlew Lake Shoreline Area.
    • Agriculture and Forest lands of Long-Term Commercial Significance have additional parcel-division restrictions.
    • On-site sewage review may also apply through NETCHD; NETCHD states that an application is complete when site-analysis approval is received from the county planning department and test holes are ready for inspection.
    “A new subdivision of land is limited to the following minimum lot sizes:”
    One more reviewed finding on this topic
    • Regulated (with conditions) — Subdivision and short-subdivision development in unincorporated Ferry County.
      “Subdivision Ordinances, including the Long Subdivision, Short Subdivision and Binding Site Plan Ordinances.”
  • Building in a floodplainRequired

    Construction or development within any area of special flood hazard in Ferry County, including structures, manufactured homes, fill, and other activities defined as development.

    • A development permit must be obtained before construction or development begins within an area of special flood hazard.
    • The ordinance applies to all special flood hazard areas within the jurisdiction of Ferry County.
    • The Ferry County Planning Director administers, implements, and enforces the ordinance and grants or denies development permit applications.
    • Applications use forms furnished by the floodplain administrator and may require plans in duplicate drawn to scale showing the nature, location, dimensions, and elevations of the area, structures, fill, storage, drainage facilities, and their locations.
    • Required application information includes lowest-floor elevation, floodproofing elevation and professional certification where applicable, watercourse alteration information, engineering analysis showing no rise of the Base Flood Elevation for proposed floodway development, and any other information reasonably required by the Floodplain Administrator.
    • Permit review must confirm ordinance compliance, all other required federal, state, and local permits, reasonable safety from flooding, and compliance with floodway encroachment provisions when applicable.
    • All development in special flood hazard areas remains subject to the ordinance and other applicable regulations.
    • The county building-department page directs applicants to contact the Planning Department for flood-hazard matters.
    “A development permit shall be obtained before construction or development begins within any area of special flood hazard established in Section 3.2.”
  • Permit processPartial

    County planning and building permit process in Ferry County.

    • The county page provides separate mobile-home, outbuilding, plumbing/mechanical, residential, and commercial application packages.
    • The opened page did not provide complete processing times or all approval steps.
    “Mobile Home Permit Application Package Out Building Permit Application Package Plumbing & Mechanical Permit Application Residential Permit Application Package Commercial Permit Application Package”
    One more reviewed finding on this topic
    • Partial — On-site sewage permit processing for Ferry County properties.
      “The following pages describe the steps for application submittal through the sewage system installation process.”

Washington rules that apply here

  • Building permitLimited

    Construction and alteration activities governed by Washington's state building code, subject to local administration and locally adopted permit exemptions.

    • Cities and counties may choose whether to adopt the permit exemption guideline.
    • The exemption applies to certain Group R, Division 3 and Group M, Division 1 construction or alteration activities with total valuation not exceeding $1,500 in any twelve-month period.
    • The activity may not affect structural components or reduce existing egress, light, air, or ventilation conditions.
    • The exemption does not include electrical, plumbing, or mechanical activities; separate permits are required for those items unless otherwise exempted.
    • The permit exemption does not exempt work from substantive state building-code standards or other applicable laws and ordinances.

    maximum exempt valuation: <= 1500 USD per 12 months (Only where the applicable city or county adopts the exemption and all stated conditions are met.)

    “Cities and counties are permitted the option of adopting a one thousand five hundred dollar building permit exemption for certain construction and alteration activities for Group R, Division 3 and Group M, Division 1 Occupancies.”
  • Owner-builder exemptionConditional

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

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

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

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

    The Washington State Building Code applies in all Washington counties and cities and includes the model codes adopted by reference in RCW 19.27.031, as amended by the Washington State Building Code Council.

    • The adoption is subject to exceptions stated in chapter 19.27 RCW and amendments adopted by the Washington State Building Code Council.
    • The 2021 International Building Code, including Appendix E, is adopted by reference with the exceptions noted in Title 51 WAC.
    • The Uniform Plumbing Code provisions affecting sewers or fuel gas piping are not adopted.
    • Only the portions of the International Wildland Urban Interface Code specifically referenced in RCW 19.27.560 are adopted.
    • The state building code is enforced by counties and cities; a county or city without a building department must contract with another county, city, or approved inspection agency.
    • The model codes are adopted or amended through a three-year state building code adoption cycle, subject to statutory interim, emergency, and legislative off-cycle amendments.

    International Building Code edition: 2021 (Including Appendix E; subject to exceptions in Title 51 WAC) · effective date of current WAC 51-50-003 adoption: 2024-03-15

    “there shall be in effect in all counties and cities the state building code [...] which are hereby adopted by reference:”
  • InspectionsRequired

    Washington residential construction for which a building permit is required, including work in Ferry County.

    • The rule applies to permit-required construction; the code official or designated agent must be able to access visible work until approval.
    • A final inspection is required before occupancy under the applicable residential code provisions.
    “Construction or work for which a permit is required shall be subject to inspection by the code official or his or her designated agent, and such construction or work shall remain visible and able to be accessed for inspection purposes until approved.”
  • 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.”
  • 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:”
  • Driveway accessRequired

    Approaches or driveway connections from abutting property to Washington county roads.

    • Permission must be obtained from the county board before construction.
    • Counties may adopt reasonable approach-construction rules, including culvert, fill-depth, and drainage requirements.
    • Construction must be supervised by the county road engineer and paid for by the person benefited.
    • Violation is a misdemeanor.
    “No person shall be permitted to build or construct any approach to any county road without first obtaining permission therefor from the board.”
    One more reviewed finding on this topic
    • Required — Approach roads and driveway connections constructed on Washington state highway rights-of-way.
      “No person, firm, or corporation may be permitted to build or construct on state highway rights-of-way any approach road or any other facility, thing, or appurtenance not heretofore permitted by law, without first obtaining written permission from the department.”
  • Campground & park staysLimited

    Camping and temporary occupancy in Washington State Parks facilities

    • Camping is permitted only in areas specifically designated or marked for camping, or as directed by a ranger.
    • State park facilities may not be used for residence purposes.
    • Continuous occupancy is limited to no more than 10 nights in one park within a 30-day period and no more than 90 nights per calendar year in all state parks, subject to stated qualifications in WAC 352-32-280 and WAC 352-32-285.
    • Occupants must vacate by 1:00 p.m. when the applicable fee is unpaid, the occupancy limit expires, or the site is reserved by another party; an additional camping fee may apply after checkout.

    maximum stay in one park: <= 10 nights per 30-day period (Limitations do not apply to individuals qualifying under WAC 352-32-280 and WAC 352-32-285.) · maximum stay in all state parks: <= 90 nights per calendar year (Limitations do not apply to individuals qualifying under WAC 352-32-280 and WAC 352-32-285.) · checkout time: 1:00 p.m. (Applies when the fee is unpaid, the occupancy limit has expired, or the site is reserved by another party.)

    “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.”
    One more reviewed finding on this topic
    • Limited — Recreational vehicles in the context of Washington's manufactured/mobile-home community statutes
      “(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.”
  • 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:”
  • 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.

  • Certificate of occupancy — General certificate-of-occupancy requirements in Ferry County.
  • Local zoning — Municipal, township, or other subordinate local zoning within Ferry County.
  • Setbacks — Building setbacks in Ferry County
  • Lot coverage — Lot coverage requirements in Ferry County
  • Living in an RV — Long-term or residential RV occupancy in Ferry County
6 more unanswered
  • Camping on your land
  • Manufactured homes
  • Off-grid sanitation
  • Well permit
  • Short-term rentals
  • Permit fees

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 Ferry County

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

Actively managed

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

Household 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 ↗
  • Streamflow Restoration 3,000-gpd basins (RCW 90.94.020)partial of county

    New permit-exempt domestic wells capped at a maximum annual-average 3,000 gpd per connection; larger/new water-right permits generally unavailable due to instream-flow rules.

    Washington Legislature — RCW 90.94.020 ↗

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 Ferry County, Washington

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

Ferry County scores 64/100 on the Bolthole Index, a strong county profile. Its strengths: deep seclusion — about 3,794 people within a 30-minute drive and manageable long-term carry cost. Watch-outs: more administrative friction around building and land use.

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

Ferry County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Northeast Tri County Health District. 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 Ferry County, Washington?

Land in Ferry County runs about $929 per acre, based on the latest county data.

What is the water situation in Ferry County?

Ferry County gets about 20.5" of rain a year, with severe drought in roughly 8.4% of years. On water rights, Ferry County lies in the Streamflow Restoration 3,000-gpd basins (RCW 90.94.020) — New permit-exempt domestic wells capped at a maximum annual-average 3,000 gpd per connection; larger/new water-right permits generally unavailable due to instream-flow rules..

How remote is Ferry County?

A representative private-land location has about 3,794 people within a 30-minute drive and 80,584 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.

Off-grid gear

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

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How Ferry compares in Washington

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