Bolthole Index county-legal census · checked 2026-10-07
1 of Oregon's 36 counties — 3% — do not require a residential building permit in their unincorporated areas. That is the 26th-largest count of any state. The strongest of them on the Bolthole Index is Washington County (50/100). Every entry below cites the county’s own official source.
Rules change, and cities inside these counties set their own — treat this as a verified starting point, not legal advice. All 627 counties nationwide → Oregon: owner-builder → Oregon: rv living → Oregon: tiny homes → Full Oregon profile →
From the Oregon guide
Oregon has a statewide building code, including a residential specialty code for houses and townhouses.114 The county figures below concern unincorporated land; project-specific building permits, zoning and land-use allowances must be checked with the local jurisdiction.215
Residential building permits are listed as required in 34 counties and limited in 1, Yamhill County.28 We could not confirm the no-permit classification for Washington County; ask the local building department before relying on that exception.315 Use the Oregon no-building-codes comparison as a starting point, then confirm the parcel’s building-permit requirements.3
Oregon’s owner-builder exemption covers ceiling heights, room sizes and specified temperature requirements, but still requires a building permit; it is not a general permission to build without inspections or codes.10 The owner-builder county list helps narrow the search, while eligibility follows the state’s conditions.10
From the Oregon guide, written from the cited official sources and re-checked by an independent reviewer. This is research, not legal advice: confirm with the office before you buy or build.
1 of 36 Oregon counties · sorted by Index score
Non-habitable one-story detached accessory structures in unincorporated Washington County. The structure must be non-habitable, one-story, and detached. The floor area must not …
What size shed can I put up in my backyard without a permit? ↗Every county here has a full profile — water, land prices, hazard safety, seclusion, and the rest of its building rules. See the Oregon state page for all 36 counties ranked, or go back to the national list.
Off-grid gear
Building on land in one of these Oregon counties? The kit we'd start with:
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General guidance, not legal advice. Off-grid, building, and land-use rules are often set at the county level and change often. Verify with your county and state before acting. Data reviewed 2026-06-26.
