Can I Build Garage Conversion in Portland, OR? (2026)
Find out if you can build a garage conversion in Portland, OR. Rules, permit requirements, costs, and next steps.
Yes, garage conversions to living space are permitted in Portland, OR. Replacement parking is not required.
Converting an attached or detached garage into living space in Portland, OR is a popular way to add an ADU or additional living area without new construction. Garage conversions are permitted in Portland, but must comply with habitable space building codes: insulation, ventilation, electrical, egress windows, and minimum ceiling height. A key consideration: California law eliminates replacement parking requirements for garage-to-ADU conversions, making garage conversions particularly attractive.
Garage Conversion Rules in Portland
Garage Conversion Rules in Portland: Allowed: Yes. Replacement parking required: No. Garage conversions to ADU are permitted in Portland and do not require replacement parking per Portland Zoning Code 33.205 and Oregon HB 2001 preemption. Building permit required to convert garage to habitable space — must meet insulation, ventilation, electrical, egress, and ceiling height requirements of Oregon Residential Specialty Code. Conversion limited to existing garage footprint. All garage conversions to habitable space require a building permit. The converted space must meet minimum habitable room standards (typically 7 ft ceiling height, egress window, insulation, and ventilation).
Costs & Fees
Garage conversion permit fees in Portland are typically based on project valuation. Contact the Portland Bureau of Development Services (BDS) at (503) 823-7300 for current fees. Conversion costs typically range $20,000–$80,000 depending on scope (permits, labor, materials, utility connections).
Timeline
Permit timeline: typically 2-6 weeks for plan check. Construction: 2-4 months for a typical garage conversion.
Next Steps
Next steps for converting your garage in Portland: 1. Determine if the conversion will be an ADU (separate unit with kitchen/bath) or additional living space. 2. Check replacement parking requirements for your zone. 3. Have a contractor assess structural requirements (ceiling height, foundation, utilities). 4. Submit plans and permit application to the Portland Bureau of Development Services (BDS). 5. See the full ADU rules page for size limits and requirements if creating an ADU unit.
Portland Bureau of Development Services (BDS)
Phone: (503) 823-7300
Website: https://www.portland.gov/bds
Online Permits: https://www.portland.gov/bds/permits-applications
Frequently Asked Questions
Can I build an ADU in Portland?
Yes. Portland is one of the most ADU-friendly cities in the US. You can build a detached ADU up to 800 sqft in your backyard or an attached ADU up to 75% of your primary home's size (max 800 sqft). Oregon HB 2001 (2019) preempts local restrictions, and Portland eliminated owner-occupancy requirements in 2016. No additional parking is required. A building permit from Portland BDS is required.
What is the difference between Portland's middle housing and ADU rules?
Portland's middle housing rules (implementing Oregon HB 2001) allow duplexes, triplexes, fourplexes, cottage clusters, and townhomes on any single-family lot by-right — these are full dwelling units. ADUs are accessory units added to a lot that already has a primary dwelling. You can combine both: for example, a duplex with an ADU in the backyard could allow up to 3 or more units on a single lot.
Do I need a permit for a home business in Portland?
Yes. A Home Occupation Permit (approximately $80) is required to operate a business from your Portland home. You may have limited client visits (up to 4 per week per business), up to 2 non-resident employees, and must not create external evidence of the business. Oregon also allows cottage food operations (baked goods, jams, etc.) with registration from the Oregon Department of Agriculture.
Can I do Airbnb in Portland?
Yes, with a permit. Portland requires a Short-Term Rental Permit (Type A or B). Type A allows renting your primary residence including entire home when you are away. Annual fee starts at $178. You must display your permit number on listing platforms. Portland collects Transient Lodging Tax (currently 11.5%) — Airbnb remits this automatically. Operating without a permit carries fines up to $500/day.
What are the setbacks in Portland's R5 zone?
In Portland's R5 zone (one of the most common single-family zones), the front setback is 10 feet, side setbacks are 5 feet on each side, and the rear setback is 5 feet. R5 allows up to 50% lot coverage and buildings up to 30 feet tall (2 stories). Verify your specific parcel at PortlandMaps.com — overlay zones, historic districts, or environmental overlays may add additional requirements.
Is solar required on new homes in Portland?
No. Oregon does not have a statewide new-construction solar mandate like California. Solar is encouraged and Portland offers expedited solar permits, but it is not required. The Oregon Residential Energy Tax Credit provides financial incentives for solar installation. Portland General Electric (PGE) and Pacific Power both offer net metering programs.
How do I look up the zoning for my Portland property?
Use PortlandMaps at portlandmaps.com. Enter your address to find your zone designation, overlay zones, flood zone status, historic designation, environmental overlay, and other land use information. Portland Maps is the official City of Portland resource and is regularly updated. You can also contact Portland BDS at (503) 823-7300 or visit the permit center at 1900 SW 4th Ave.
Source: Portland Bureau of Development Services (BDS) — Building Regulations. Last verified April 5, 2026. View source