State building permit guide
Oregon building permits — complete guide (2026)
Oregon is one of the most ADU-friendly states in the nation and has pioneered housing-forward permitting reform. Portland's Residential Infill Project and statewide ADU law have made Oregon a national model for accessory dwelling unit permitting.
Avg cost: $175–$700
Processing: 2–6 weeks
~24,000 permits/year
36 counties
$175–$700Average permit cost
2–6 weeksProcessing time
~24,000Permits issued/year
Yes — among top 3 in USADU-friendly
Oregon's statewide ADU law (SB 1051, 2017; HB 2001, 2019) requires all cities over 2,500 population to allow ADUs on single-family lots. Cities cannot require owner-occupancy, prohibit rental, or impose parking requirements. Oregon also has strong seismic requirements for the Cascadia Subduction Zone — all structural permits in western Oregon must address seismic design.
Permit costs by type — Oregon
| Permit type | Fee range | Processing time | Notes |
|---|---|---|---|
| Electrical | $100–$275 | 1–5 days | Oregon licensed electrician required |
| Plumbing | $85–$240 | 1–5 days | Oregon licensed plumber required |
| HVAC / Mechanical | $100–$275 | 2–6 days | Heat pump adoption very high in OR |
| Roofing | $150–$375 | 1–4 days | Seismic connections for heavy tile roofs |
| New Construction | $700–$2,200 | 3–8 weeks | Portland — high cost, longer review |
| Room Addition | $400–$1,100 | 2–6 weeks | Seismic design required in western OR |
| ADU (detached) | $500–$1,200 | 2–6 weeks | State law prevents unreasonable denial |
| ADU (garage conversion) | $350–$900 | 1–5 weeks | Fastest path to ADU in most OR cities |
| Solar | $100–$275 | 1–5 days | Oregon Residential Energy Tax Credit |
| Deck / Patio | $150–$450 | 1–4 weeks | Seismic connections for attached decks |
How to get a building permit in Oregon
1
Oregon Building Codes Division or local jurisdiction
Portland, Eugene, Salem, and most cities over 4,000 population issue their own permits. Smaller cities and rural counties may use the Oregon BCD.
2
Seismic design — critical in western Oregon
Oregon's Cascadia Subduction Zone creates major earthquake risk in western Oregon. All structural projects must address seismic design. Engineers familiar with OR seismic requirements are essential.
3
ADU permitting — Oregon is easy
Under SB 1051 and HB 2001, Oregon cities must approve compliant ADU applications. Pre-approved ADU plan programs are available in Portland and Eugene.
4
Submit application
Portland's permit system (ePermitting) is well-developed. Eugene, Salem, and Bend have online systems. Rural Oregon uses Oregon BCD.
5
Inspections
Oregon cities have active inspection programs. Oregon BCD covers rural areas with regional inspection staff.
Permit costs by county — top Oregon counties
Multnomah (Portland) County
$225–$700
3–7 weeks
Washington (Beaverton/Hillsboro) County
$200–$625
2–6 weeks
Clackamas (Lake Oswego) County
$200–$600
2–5 weeks
Lane (Eugene) County
$175–$550
2–5 weeks
Marion (Salem) County
$150–$500
2–4 weeks
Deschutes (Bend) County
$175–$575
2–5 weeks
Frequently asked questions — Oregon permits
How ADU-friendly is Oregon?
Extremely. Oregon's HB 2001 (2019) requires all Oregon cities with more than 2,500 residents to allow ADUs on single-family lots by right. Cities cannot require owner-occupancy, parking, or design standards stricter than the primary home.
What is the Cascadia Subduction Zone and how does it affect Oregon permits?
The Cascadia Subduction Zone is a major fault system offshore of Oregon and Washington capable of a magnitude 9+ earthquake. Western Oregon is in Seismic Design Category D — all structural construction must meet enhanced seismic requirements.
Does Oregon require permits in rural areas?
Yes. Oregon's Building Codes Division enforces codes in jurisdictions that lack their own building departments. There are very few areas in Oregon without some form of code enforcement.
What is Oregon's energy code and how strict is it?
Oregon's Residential Specialty Code energy provisions are among the strictest in the US. New construction requires high insulation levels, high-performance windows, and heat pumps in most cases. Oregon is pushing toward net-zero ready construction.
Data sources: US Census Bureau BPS 2024 · Oregon Oregon Building Codes Division · Shovels.ai permit aggregator