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

At a glance

Building permit

Required for most construction in unincorporated areas¹

Zoning

Yes; administered by the county in unincorporated areas⁴

Septic permits

Required for new, repaired, expanded, installed or replaced systems; handled by Clallam County Environmental Health Services⁵⁶

Owner-builder exemption

Available from contractor registration for work on your own property or personal residence, but county permits still apply⁷

Minimum dwelling size

At least 190 sq ft of habitable space under the state building code⁸

Tiny home on wheels

A county placement permit, approved water and sewage disposal, and final inspection are required before occupancy⁹

One RV on a bare parcel

No county duration limit where no residence exists; sewage disposal must be addressed beyond 30 days¹⁰

County-road access

A road-approach permit is required before an address is assigned for a project approaching a county road¹¹

Who to call

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

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

Clallam County requires a building permit for most building and structure work in unincorporated areas, and the county enforces the Washington State Building Code¹². The county's own definition is broad: a permit is required if you erect, construct, enlarge, alter, repair, move, improve, convert or demolish a building or structure, and that reaches beyond framing to things like mobile home placement, wood stove installation and plumbing modifications³. A short list of small residential structures is exempt: a single-story detached tool or storage shed under 400 square feet and at least 6 feet from an existing building, a fence no more than 7 feet high, a retaining wall under 4 feet without a surcharge, and an uncovered deck 30 inches or less above grade extending 3 feet beyond its edge³. Washington lets a person work on their own property or personal residence without contractor registration when the work is not for sale, demolition or lease, but that owner-builder exemption does not remove Clallam County building-permit requirements⁷.

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

Clallam County's Building Division, part of the Department of Community Development, is at 223 East 4th Street in Port Angeles, with a direct line at 360-417-2318¹². Building customer service is open Monday through Friday from 8 in the morning until 4:30 in the afternoon, and all building applications must be submitted through the county's online portal¹². The county publishes fee schedules for building, mechanical and plumbing permits; plan-review fees are due with the plans, while planning-review, state-code and building-permit fees are due before issuance¹³. The Department of Community Development handles zoning and development and building permits at 360-417-2000¹⁴. Septic permits remain with Environmental Health Services at (360) 417-2258, and county-road questions go to the Roads Division at 360-417-2379¹⁵¹⁶.

Does Clallam County have zoning?

Clallam County has zoning in unincorporated areas, administered by the Department of Community Development⁴. Lot rules are district-specific: in the Rural Very Low (R20) district, the minimum lot size is 5 acres, minimum width is 75 feet, and maximum residential density is one dwelling per 20 acres¹⁷. The Carlsborg Urban Growth Area instead uses several commercial and industrial districts, classifies uses as allowed, conditional or prohibited, and can require a conditional-use permit where a parcel abuts residentially zoned property¹⁸. Setbacks can also change with the district, wells, drainfields, bluffs, shorelines, wetlands, habitat areas and critical-area buffers¹⁹. Washington's building code requires a covered dwelling to have at least 190 square feet of habitable space⁸. Ask the Department of Community Development to confirm the parcel's district, allowed use, density and setbacks before buying¹⁴.

How do septic permits work in Clallam County?

Clallam County Environmental Health Services processes septic permits throughout the county, with state health rules also applying⁵. Installing, repairing or replacing any part of a septic system requires a county permit, and some complicated systems also require an operation and maintenance agreement⁶. A site registration is the first step: soils are evaluated to determine which septic system could work, beginning with a licensed septic system designer²⁰. New-system construction permits expire three years after issuance, tank-placement permits last one year, and repair permits expire after six months unless officially extended⁶. Only about 1.5% of Clallam County soils are rated free of severe limits for a conventional drain field, so complete the site evaluation early and budget for a possible engineered or alternative system²¹. Where sewer is available, a county sewer permit is required for a new connection, extension, repair or replacement, and decommissioning a septic system requires a permit before a side-sewer permit is issued²².

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

On an unincorporated Clallam County parcel with no residence, one RV may be occupied indefinitely under current regulations, but adequate sewage disposal must be addressed when occupancy extends beyond 30 days²³. Where a house is present, an RV intended as temporary living quarters cannot serve as permanent accessory housing, and occupancy in the same location for 90 or more consecutive days violates the accessory-housing rule²⁴. Two or more occupied RVs may constitute an RV park and trigger separate zoning restrictions or approvals²³. A park model, recreational park trailer or tiny home on wheels with an appropriate state insignia requires a Clallam County placement permit, approved water and sewage disposal, required electrical service, and an approved final inspection before occupancy⁹. Only one park model is allowed on a legal residential lot unless multiple units are within an approved binding site plan, and park models may not be placed in a designated floodplain⁹.

What are the steps to build a home in Clallam County?

1. Confirm the parcel's zoning designation and ask about critical-area constraints with the Department of Community Development at 360-417-2000¹⁴.
2. If the project approaches a county road, obtain a Road Approach Permit from the County Roads Department before an address can be assigned; applications may be filed in the county permit portal¹¹. A connection on a state-highway right-of-way instead needs written permission from the Washington Department of Transportation²⁵.
3. If the site needs septic, contact a licensed septic designer to begin the site registration and soil evaluation with Environmental Health Services²⁰.
4. If the property lies in a floodplain, contact the county for a floodplain development permit before starting work²⁶.
5. Submit the building application through the county's online portal; plan-review fees are due with the plans, while planning-review, state-code and building-permit fees are due before issuance¹³.
6. Ask the Building Division which inspections and occupancy approval apply, because we could not confirm those countywide requirements from the available official material¹².

What should you check before buying land in Clallam County?

Clallam County farmland averages about $19,353 an acre, and a typical county home is valued around $501,030²⁷²⁸. Septic feasibility deserves early attention: only 1.5% of Clallam County soils are rated without severe limits for a conventional drain field, while 27.5% of county land has a slope of 15% or less²¹²⁹. Arrange the septic site registration and soil evaluation before treating a parcel as buildable²⁰. Clallam County averages about 90.4 inches of precipitation annually, and 90.7% of its land is wooded, so inspect drainage, road condition and tree hazards in person³⁰³¹. Federal land accounts for 46.6% of the county, making legal access and boundary review especially important on remote parcels³². The effective property-tax rate is about 0.7%, and the median annual property-tax bill is roughly $2,860³³³⁴. We could not confirm a countywide private-well permit rule, so ask Environmental Health what water-source documentation the building application will require¹⁵.

Watch-outs

• One RV on a parcel without a residence has no county duration limit, but sewage disposal must be addressed after 30 days; the separate accessory-housing rule is more restrictive, and a pending RV ordinance could change both¹⁰²⁴²³.
• Do not assume a neighboring parcel's setback applies: zoning districts differ, and wells, drainfields, bluffs, shorelines, wetlands, habitat areas and critical-area buffers can add restrictions¹⁹.
• Only 1.5% of Clallam County soils are rated without severe limits for a conventional septic drain field, so complete the site evaluation early²¹²⁰.

Sources

1. Building Permits, quoted and re-checked
2. RCW 19.27.050 Enforcement, quoted and re-checked
3. Clallam County Building Division (clallamcountywa.gov)
4. Community Development (DCD), quoted and re-checked
5. Septic System Permits, quoted and re-checked
6. Septic System Permits, quoted and re-checked
7. RCW 18.27.090: Exemptions, quoted and re-checked
8. WAC 51-50-1208: Section 1208—Interior space dimensions, quoted and re-checked
9. 21.06.030 Park model placement requirements | Clallam County Code, quoted and re-checked
10. Board of Clallam County Commissioners Minutes, quoted and re-checked
11. Addressing System, quoted and re-checked
12. Clallam County Building Division (clallamcountywa.gov)
13. 5.100.310 Fees for Building Division services – See Fee Schedules 310-A, 310-B and 310-C | Clallam County Code, quoted and re-checked
14. Clallam County Department of Community Development (DCD) (clallamcountywa.gov)
15. Clallam County Environmental Health Services (CCEH) (clallamcountywa.gov)
16. Clallam County Roads Division (clallamcountywa.gov)
17. 33.10.010 Rural Very Low (R20) | Clallam County Code, quoted and re-checked
18. clallamcountywa.gov, quoted and re-checked
19. Residential Setbacks, quoted and re-checked
20. Clallam County Environmental Health Services (CCEH) - Septic Process (clallamcountywa.gov)
21. 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
22. Sewer Permits, Fee Schedules, Inspection & Installation, quoted and re-checked
23. County Code | Clallam County, WA, quoted and re-checked
24. 33.50.030 General requirements | Clallam County Code, quoted and re-checked
25. RCW 47.32.150 — Approach roads, other appurtenances—Permit (Washington statewide rule), quoted and re-checked
26. Planning & regulation — Washington State Department of Ecology (Washington statewide rule), quoted and re-checked
27. Farmland value per acre (USDA census): Bolthole Index county data
28. Typical home value (Zillow): Bolthole Index county data
29. Share of land at 15% slope or less: Bolthole Index county data
30. Annual precipitation: Bolthole Index county data
31. Wooded share of land: Bolthole Index county data
32. Federal land share: Bolthole Index county data
33. Effective property tax rate: Bolthole Index county data
34. Median property tax bill: Bolthole Index county data

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.