Unincorporated Lincoln County, Washington requires a building permit and inspections for a new site-built home12. The county administers zoning, and Lincoln County Public Health permits and inspects onsite sewage systems34. Before applying, obtain a site address and document potable water and septic approval1.
At a glance
- Building permit
- Required for a new site-built home, with inspections12
- Zoning
- Yes in unincorporated areas; standards vary by district35
- Septic permit
- Required for every new onsite system; handled by county Public Health46
- Owner-builder
- Contractor registration exemption is conditional; permits still apply7
- RV living
- Limited to 30 continuous days unless a compliant home is under construction; no more than 2 occupied RVs per parcel8
- Tiny house
- Recognized by the state building code; county siting and occupancy still need approval9
- Minimum lot size
- District-specific; residential sites depend on water and septic capacity, while several zones use 20,000 square feet101112131415
- Conventional septic soils
- About 18.4% of soils lack severe drain-field limitations16
Who to call
Building permits
Lincoln County Building Division
Building-permit applications and technical building inquiries for Lincoln County
Planning & zoning
Lincoln County Building, Planning & Land Services
Title 16 land divisions, Title 17 zoning and physical addressing
27234 State Route 25 N, Davenport, WA 99122
Septic permits
Lincoln County Public Health, Environmental Health Department
On-site sewage applications, design review and inspections
90 Nicholls St, Davenport, WA 99122
Contact details are copied from each office’s official page and were checked against it on October 15, 2026.
Off-grid gear
Going off-grid in Lincoln County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
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Do you need a building permit in Lincoln County, Washington?
Yes. A new site-built home in unincorporated Lincoln County requires a county building permit; obtain the physical address before applying and post the address before work begins17. The application requires potable-water proof, septic approval, contractor documentation and construction plans17. Residential work receives applicable foundation, under-floor, sub-floor, framing, insulation, gas and final inspections; the county requests at least two days' advance notice18. Washington Labor and Industries handles electrical permits and inspections19. Lincoln County applies the Washington State Building Code, but its code page still lists the 2018 editions for applications beginning in 2021; ask the Building Division which edition governs a new filing20. Owner-builders may qualify for a contractor-registration exemption, but building permits and inspections still apply; the exemption excludes contractor activities on one's own property for selling, demolishing or leasing21. Agricultural work can have a separate contractor-registration exemption, which also leaves applicable building permits and land-use rules in place22.
Who issues building permits in Lincoln County, and how do you reach them?
Lincoln County's Building Division accepts online building-permit applications and credit-card payment, with technical questions directed to 509-721-053923. Building, Planning & Land Services handles zoning, land divisions and physical addressing at 27234 State Route 25 N, Davenport, WA 99122; call 509-348-013024. Inside the Town of Wilbur, the town administers building permits for new construction, remodeling and alterations; Lincoln County Public Health remains the onsite-sewage authority2526. County building fees vary, and excessive repeat inspections can add at least $50; ask the Building Division for a project-specific total27. Published septic charges include $150 for reinspection or a modified site plan and $60 for a one-year permit extension28. County-road approaches require access permits, and an existing approach is reevaluated when its use changes, including from farm to residential29.
Does Lincoln County, Washington have zoning?
Lincoln County administers Title 17 zoning in unincorporated areas, with Agricultural, Recreational, Public Facilities, Residential, Commercial, Local Business, Industrial and Airport Overlay districts35. Davenport and the Town of Wilbur have their own zoning; onsite-sewage review remains with Lincoln County Public Health303126. Residential and Recreational sites must accommodate Environmental Health-approved water and sewage systems1011. Public Facilities, Commercial, Local Business and Industrial districts use a 20,000-square-foot minimum, with a land-division approval exception for Commercial lots12131415. Agricultural land divisions generally require at least 20 acres, subject to stated land-quality, location and Environmental Health conditions32. Airport Overlay residential divisions in zones 4, 5 and 6 use a 2.5-acre minimum, with case-by-case density consideration33. Residential standards include 10-foot setbacks on all sides and 30 feet along state or county roadway rights-of-way, reduced to 10 feet for a county road within a legal subdivision; confirm the parcel's district with Planning341024. Local Business limits structures and impervious surfaces to 65% lot coverage35.
How do septic permits work in Lincoln County?
Lincoln County Public Health reviews, permits and inspects onsite sewage installations, and every new system requires an application and permit266. The process includes a test-hole inspection, design review, fee payment, construction, a final county inspection and an as-built document; adequate water must be validated before the septic permit issues636. Applications remain valid for 2 years and issued permits for 3 years; major repairs require notice and a permit, while minor repairs do not37. Contact Environmental Health at 509-725-1001 or visit 90 Nicholls St, Davenport, WA 9912238. Conventional gravity systems require inspection every 3 years, all other systems require annual inspection, and property-transfer inspections begin February 1, 202739. Homeowners may use the county form to inspect their own conventional gravity systems, but a licensed operation-and-maintenance specialist must perform a property-transfer inspection39. Only about 18.4% of county soils lack severe limitations for a conventional drain field, so establish septic feasibility before choosing the house site16.
Can you live in an RV or tiny home in Lincoln County?
In unincorporated Lincoln County, RV occupancy is limited to 30 continuous days unless a permanent residence is under construction in compliance with zoning, health and applicable land-division and building rules; no more than 2 RVs may be occupied on a parcel at once8. Site-built camping cabins, yurts and similar units without Labor and Industries certification need a county building permit and may not exceed 400 square feet or 15 feet in height40. Washington's residential code recognizes tiny houses of no more than 400 square feet, excluding sleeping lofts, but county siting and occupancy approval remain separate9. Washington's 190-square-foot minimum habitable-space rule applies to IBC dwelling units; it does not establish a general minimum for IRC-governed houses41. Manufactured homes need an installation permit before delivery; more than 2 per parcel requires a mobile-home-park conditional-use permit, and placement alongside an existing stick-built house for family or a caretaker needs Land Services approval42. County materials disagree on whether homes built in 1976 are prohibited; ask the Building Division before buying an older unit424323. Off-grid wastewater still requires an approved onsite sewage system44.
Building a home in Lincoln County: what are the steps?
- Ask Planning to identify the parcel's zoning district, allowed use, setbacks, lot standard, land-division history and addressing process53424.
- Establish water. Before drilling a well, submit the required notice of intent 72 hours in advance; the notice is not a water right or permit to use water45.
- Have Environmental Health validate the water supply and issue the septic permit before the residential building application61.
- Obtain the physical address and county-road access approval, including reevaluation of an approach changing from farm to residential use4629.
- If the parcel is in a special flood-hazard area, obtain the county development permit before work begins47.
- Submit the site plan, water and septic proof, contractor documentation and construction plans through the online permit system4648.
- Schedule each required inspection, including the final inspection when the building is complete and ready for occupancy2.
What should you check before buying land in Lincoln County?
Check septic feasibility early: only about 18.4% of Lincoln County soils lack severe limitations for a conventional drain field16. A residential building site also needs a minimum boundary on any side of 75 feet for a single-family home or 125 feet for multifamily and nonresidential uses10. Local Business and Industrial setback examples are 35 feet at the front and 20 feet at the side or rear, so a residential setback assumption may leave the wrong building envelope49. Except for specific exemptions, dividing unincorporated land for sale, lease or transfer must comply with the county land-division rules50. Every subdivision lot needs direct public- or private-road access; work in state-highway right-of-way requires written state permission5152. Final plats must show utility easements and obtain written utility-adequacy confirmation; public water or sewer may be required where private facilities are infeasible53. Special flood-hazard-area development needs a county permit before work begins47. Lincoln County averages about 13.1 inches of annual precipitation, and a well-drilling notice does not authorize water use, so establish legal and physical water availability before buying5445.
Watch-outs
- A residential building-permit application needs a site address, potable-water proof and septic-site approval1.
- Lincoln County requires septic inspections every 3 years for conventional gravity systems and annually for other systems; property-transfer inspections begin February 1, 202739.
- A special flood-hazard-area development permit is required before construction, and designated floodways sharply limit new residential work5556.
- RV occupancy is capped at 30 continuous days unless a compliant permanent residence is under construction, and only 2 RVs may be occupied on one parcel at once8.
Sources
- Site Built Residences, quoted and re-checked
- Site Built Residences, quoted and re-checked
- Building, Planning & Land Services, quoted and re-checked
- Environmental Public Health, quoted and re-checked
- Title 17 - Zoning, quoted and re-checked
- Onsite Sewage Systems, quoted and re-checked
- RCW 18.27.090 Exemptions, quoted and re-checked
- Title 17 - Zoning, quoted and re-checked
- WAC 51-51-003 — International Residential Code, quoted and re-checked
- Lincoln County Code — Title 17 Zoning, quoted and re-checked
- Lincoln County Code — Title 17 Zoning, quoted and re-checked
- Lincoln County Code — Title 17 Zoning, quoted and re-checked
- Lincoln County Code — Title 17 Zoning, quoted and re-checked
- Lincoln County Code — Title 17 Zoning, quoted and re-checked
- Lincoln County Code — Title 17 Zoning, quoted and re-checked
- 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
- Site Built Residences, quoted and re-checked
- Site Built Residences, quoted and re-checked
- Building, Planning & Land Services | Lincoln County, WA, quoted and re-checked
- State & International Building Codes, quoted and re-checked
- RCW 18.27.090: Exemptions, quoted and re-checked
- RCW 18.27.090 Exemptions, quoted and re-checked
- Lincoln County Building Division (lincolncountywa.com)
- Lincoln County Building, Planning & Land Services (lincolncountywa.com)
- Town of Wilbur: Town of Wilbur, WA Municipal Code (eCode360) (Lincoln County), quoted and re-checked
- Onsite Sewage Systems, quoted and re-checked
- Building Division, quoted and re-checked
- Title 17 - Zoning, quoted and re-checked
- lincolncountywa.com, quoted and re-checked
- Davenport: City of Davenport, WA Municipal Code table of contents (eCode360) (Lincoln County), quoted and re-checked
- Town of Wilbur: Town of Wilbur, WA Municipal Code (eCode360) (Lincoln County), quoted and re-checked
- Lincoln County Code, Title 17 - Zoning, quoted and re-checked
- lincolncountywa.com, quoted and re-checked
- Lincoln County Code, Title 17 - Zoning, quoted and re-checked
- Title 17 - Zoning, quoted and re-checked
- Onsite Sewage Systems, quoted and re-checked
- Onsite Sewage Systems, quoted and re-checked
- Lincoln County Public Health, Environmental Health Department (lincolncountywa.com)
- Onsite Sewage Systems, quoted and re-checked
- lincolncountywa.com, quoted and re-checked
- WAC 51-50-1208 — Section 1208—Interior space dimensions, quoted and re-checked
- lincolncountywa.com, quoted and re-checked
- lincolncountywa.com, quoted and re-checked
- Onsite Sewage Systems, quoted and re-checked
- Well construction notice of intent, quoted and re-checked
- Site Built Residences, quoted and re-checked
- Title 15 - Flood Damage Prevention, quoted and re-checked
- Building Division, quoted and re-checked
- Title 17 - Zoning, quoted and re-checked
- Lincoln County Code, Title 16 - Land Divisions, quoted and re-checked
- lincolncountywa.com, quoted and re-checked
- RCW 47.32.150 — Approach roads, other appurtenances—Permit (Washington statewide rule), quoted and re-checked
- Title 16 - Land Divisions, quoted and re-checked
- Annual precipitation: Bolthole Index county data
- Lincoln County Code, Title 15, Chapter 15.16 Flood Damage Prevention, quoted and re-checked
- Lincoln County Code, Title 15, Chapter 15.16 Flood Damage Prevention, quoted and re-checked
Written October 15, 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.