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

Yes. A new dwelling in unincorporated Garfield County requires a county building permit, plan review and inspections¹. The county's own permit FAQ says owners or authorized agents doing covered construction outside city limits must complete a building permit³. Washington's building code applies in every county and city, with local enforcement⁹. For homes, that means the 2021 International Residential Code with state amendments, effective in all Washington counties and cities on March 15, 2024¹⁰. Do not assume a small project is automatically exempt: Washington merely allows local governments to adopt a limited valuation-based exemption, and the available information does not establish that Garfield County adopted it¹¹. Ask Public Works which applications and trade permits your exact scope needs before ordering materials.

Garfield County routes building and planning work through Public Works at 19th and Arlington in Pomeroy; the listed phone is (509) 843-1301³. The county makes its building-permit process information and application available online³. Application review is project-specific, so describe the parcel, proposed use, structure and utilities when you call. For floodplain questions on land outside Pomeroy, the county directs callers to Public Works at the same phone number and lists its mailing address as 300 S 19th Street, PO Box 160, Pomeroy, WA 99347¹².

Garfield County administers a zoning ordinance, and its Planning Division reviews proposals for zoning, critical areas, environmental review, shoreline compliance and related development issues². That means a buildable-looking rural tract still needs a parcel-specific answer on allowed uses, setbacks, lot size, height and access. Current countywide numbers for those standards could not be confirmed, so ask Garfield County Public Works for the parcel's zoning designation and the controlling ordinance text before designing³. Washington also regulates subdivisions and short subdivisions, and approval must conform to applicable zoning or other land-use controls¹³. A floodplain site adds a local development-permit step through the county government^12,14.

Garfield County's local health jurisdiction administers on-site sewage permits, and county information identifies the Garfield County Health District at 121 South 10th Street in Pomeroy, phone (509) 843-3412^3,4. Except for a minor repair, Washington requires an application and local-health permit before installing, repairing, modifying, connecting to or expanding an on-site sewage system⁵. The state application process calls for site and soil evaluation, a site plan, the water source and a detailed system design⁵. The local health officer must respond to a complete application within 30 days¹⁵. County information also says the septic construction permit must be approved before the building permit is released, so start septic review first⁴. Washington can require connection to public sewer when a sewer utility allows it and has adequate service within 200 feet, so ask whether a sewer line is near the parcel¹⁶. Only about 15% of county soils are rated without severe limitations for a conventional drain field, so make septic feasibility an early contingency rather than a post-purchase task¹⁷.

Garfield County's rule for living in an RV on private land could not be confirmed; call Public Works with the parcel number and ask about both temporary occupancy and occupancy during construction³. The state definition describing an RV as temporary, transient quarters that are not a primary residence does not itself grant private-land siting permission¹⁸. A Washington tiny house may be built on wheels and may be no larger than 400 square feet, but it must meet the Washington State Building Code and remains subject to local foundation, installation, location and permit requirements⁷. Garfield County zoning applies, so a tiny home's legality depends on the parcel and proposed placement as well as the structure itself².

1. Call Garfield County Public Works at (509) 843-1301 with the parcel number, proposed use and site concept; confirm zoning, setbacks, critical areas, floodplain status and required applications^2,3.
2. Arrange septic site and design review with the Garfield County Health District before construction begins^3,5.
3. Obtain county permission before building an approach to a county road, or written state permission for an approach on a state-highway right-of-way^8,19.
4. Submit the county building-permit application and plans; a valid complete application is considered under the building and land-use rules in effect on its application date²⁰.
5. Schedule the required inspections with the county and obtain final acceptance before occupancy; the exact inspection stages and certificate process should be confirmed with Public Works^1,3.

Start with zoning and legal access: Garfield County has zoning, while a new county-road approach needs county permission and must meet county drainage and construction rules^2,8. Check septic feasibility next because only about 15% of county soils avoid a severe conventional-drain-field limitation¹⁷. Review flood mapping with Public Works before placing improvements; development in a Washington floodplain requires a local floodplain development permit^12,14. Before drilling a well, the owner or agent must give the state at least 72 hours' notice of construction, whether or not a water-right permit is needed²¹. The county averages about 19.8 inches of precipitation annually, and only about 26.7% of its land is at a slope of 15% or less, so verify the actual parcel's water source, terrain and buildable area rather than relying on county averages¹⁷. The median property-tax bill is about $1,306 a year, with an effective rate near 0.6%¹⁷.