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

Yes. Pacific County requires a building permit for work in unincorporated areas unless the project fits a stated exemption¹. One qualifying temporary-foundation storage building may be exempt when it is no larger than 120 square feet, no taller than 10 feet, at least 5 feet from side and rear property lines, and has no plumbing; low decks and listed minor work may also qualify¹. Washington's State Building Code applies statewide, and Pacific County administers building-code review locally^8,9. Required inspections must occur before work advances, with the permit and approved plans kept on site¹. Owner-builders may qualify for a contractor-registration exemption when working on their own property, but that exemption does not remove building, electrical, plumbing, septic or other permit requirements⁵.

Pacific County's Department of Community Development takes building permit, land-use, property-division and on-site septic applications for the county¹⁰. Inside Ilwaco, Long Beach, Raymond and South Bend, zoning is separate from the county, so ask the city for zoning approval there; septic permits still come from county Environmental Health^2,3. For building-permit help, call the South Bend office at (360) 875-9356 or email lmartindale@co.pacific.wa.us¹⁰. The Long Beach planning office answers at (360) 642-9382 and ngray@co.pacific.wa.us¹⁰. Use the appropriate form and submit all required documentation; county staff guide applications through the project phases¹⁰. Building and plan-check fees depend on project valuation and square footage, and all applicable fees must be paid before permit issuance². Do not start work until the department has contacted you, all fees are paid and the approved permit has been received¹. Request inspections at least 24 hours in advance during business hours or through the inspection hotline¹.

Yes. Pacific County administers zoning in unincorporated areas, while Ilwaco, Long Beach, Raymond and South Bend have separate jurisdiction². The county publishes zoning maps and an interactive parcel map, and each district has its own permitted, accessory, conditional and prohibited uses². General setbacks are 20 feet in front, 10 feet in back and 5 feet on the sides, but district, building type, water features, easements and access can change them². Many districts cap residential and accessory structures at 35 feet, though the exact height is district-specific⁶. A proposed residence must contain at least 410 square feet of living area, excluding garages, carports, decks and porches⁶. New lots must satisfy the applicable district and subdivision standards, while legally created lots remain legal lots of record despite the referenced minimum-lot-size rule⁶. Detached accessory living quarters for the owner, temporary guests or employees are listed as accessory uses and must meet the district's standards⁶. Ask Planning to confirm the parcel-specific standards before designing¹⁰.

Pacific County Environmental Health administers on-site sewage rules in both incorporated and unincorporated areas³. A permit is required to construct, repair, replace, expand or significantly alter a septic system, including work on a failed system⁴. For septic or well questions, call Environmental Health at 360-208-4713 or email emcmillan@co.pacific.wa.us¹¹. Only about 6.8% of Pacific County soils are rated without severe limitations for a conventional drain field, so establish septic feasibility before treating a parcel as buildable⁷. A septic operation-and-maintenance inspection is required before a sale, trade or gift can be recorded; short-term rentals, RV parks, campgrounds and certain other uses face additional operating-permit and inspection rules². A property not connected to public sewer still needs a sanitation system that meets the county health ordinance, so off-grid does not mean wastewater-system-free⁴. Well permit applications are obtained from the Washington Department of Ecology regional office, and a licensed, bonded well contractor is required unless a statutory exemption applies¹².

Pacific County allows one registered, readily transportable RV to be temporarily occupied or stored on a parcel, but it cannot be permanently affixed or used as a permanent dwelling². Occupancy beyond 7 consecutive days or 30 days in a calendar year requires sewer or an approved septic system unless the administrator accepts proof of licensed pumping or dump-station service². Long-term RV occupancy may be approved for up to 1 year with an active building permit and measurable progress, or to care for a sick family member². Tent camping is prohibited on vacant lots in several residential and mixed-use districts but may be allowed in other districts subject to health rules⁶. A Washington tiny house can be no larger than 400 square feet and still needs code compliance and local placement approval¹³. Pacific County's specific tiny-home classification could not be confirmed; ask Planning before buying or placing one¹⁰.

1. Confirm jurisdiction, then use the county maps and ask Planning for the parcel's zoning district, allowed use, setbacks and height limit^2,10.
2. Establish septic feasibility early because only about 6.8% of county soils are rated without severe limits for a conventional drain field⁷.
3. Confirm that the lot can accommodate setbacks, water, parking, access and sewage disposal².
4. Use the appropriate development forms and assemble all required documentation for Community Development¹⁰.
5. Obtain a road-approach permit if the driveway connects to a county road; state-highway access goes through the Washington State Department of Transportation⁹.
6. Pay the valuation- and square-footage-based building and plan-check fees, then wait for the approved permit before starting^1,2.
7. Request each required inspection before advancing the work and keep approved plans on site¹.

Start with buildable area: only about 28.2% of Pacific County land is at a slope of 15% or less, and about 81.1% is wooded⁷. Confirm the zoning district and legal-lot status because property divisions are regulated countywide and new lots must accommodate parking, setbacks, water, access and sewage disposal². Check septic feasibility because only about 6.8% of soils are rated without severe limitations for a conventional drain field⁷. Annual precipitation averages about 88.3 inches, and floodplain development requires a local permit^7,14. Verify driveway approval for county-road or state-highway access⁹. If rental income matters, short-term rentals may be allowed outright, require a special-use permit and hearing, or be prohibited depending on zoning, with septic operating rules also applying². Manufactured homes outside approved parks face age, installation and title requirements².