Fees
Estimated city fees
Baseline for a simple permitted addition: $700–$2,500+ estimated city and state fees for a permitted residential addition in Portland (varies by project valuation; trade permits and the 12% state surcharge are billed separately)
| Fee | Amount | Notes |
|---|---|---|
| Building permit (valuation-based) | $700–$2,500+ (estimated range for typical room addition) | Portland BDS permit fees are based on valuation, per the current fee schedule. A state surcharge (12% of permit fee) is added to all permits. Check current amounts at portland.gov/bds. |
| Plan review fee | Charged at submittal, approximately 35% of permit fee | Portland charges a plan review deposit when you submit. The balance is due when the permit is issued. The Oregon state surcharge applies. |
| Mechanical permit | $150–$450 (estimated) | Required for HVAC extensions or new equipment. The state surcharge applies. |
| Electrical permit | $150–$500 (estimated) | Required for new circuits, panels, or service changes. You file Oregon electrical permits through BDS. |
| Plumbing permit | $150–$450 (estimated) | Required for any new bathroom or wet area in the addition. |
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Conditions
The rules that apply
- Any addition that increases the enclosed floor area or structural footprint of a residential building in Portland needs a building permit.
- Portland Bureau of Development Services (BDS) processes residential addition permits.
- An addition with a bathroom, laundry room, or wet area also needs a plumbing permit.
- An addition that extends or adds HVAC equipment or ductwork needs a mechanical permit.
- New electrical circuits, subpanels, or service upgrades need a separate electrical permit under the Oregon Electrical Specialty Code.
- Additions must comply with Portland Zoning Code (Title 33). Setbacks, lot coverage, height limits, and floor area ratio vary by base zone.
- Every conditioned addition must comply with the energy requirements of the Oregon Residential Specialty Code (ORSC) and Oregon Energy Code.
- A property that is a designated historic resource, or in a Historic District or Conservation District, needs a Type II Historic Resource Review before permits are issued.
- Additions in Portland's landslide hazard, flood hazard, or environmental overlay zones get additional review and may need a Type II land use decision.
- Portland's ePermitting system requires you to submit plans electronically for most residential construction permits.
Documents
What you'll need to file
- Building permit application, submitted through the Portland Development Hub (ePermitting portal).
- Site plan showing lot dimensions, property lines, setbacks, existing structures, impervious surface, trees, and the footprint of the proposed addition.
- Floor plans for all affected levels, showing the existing and proposed layout, room dimensions, and window and door sizes.
- Exterior elevations showing existing and proposed building height and materials.
- Foundation and framing details, with prescriptive or engineered structural documentation.
- Energy code compliance worksheets under the Oregon Residential Energy Code.
- Geotechnical or landslide hazard documentation if the site is in a mapped hazard area.
- Historic Resource Review approval if the property is in a historic district or is a designated landmark.
- Trade permit applications for any mechanical, electrical, and plumbing work in the project.
Process
How the permit process works
Each step must finish before the next one starts.
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Check zoning and overlay zones Use PortlandMaps to look up your base zone, setbacks, lot coverage limits, and any overlay zones (historic, environmental, flood, landslide hazard). Portland zoning often tightly limits addition size and placement, especially in inner Portland neighborhoods.
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Find out if land use review is required A property in a Historic District, Conservation District, or environmental overlay zone may need a land use decision before building permits are issued. Ask BDS whether your addition needs a pre-application conference or Type II review.
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Hire a designer or architect Portland residential additions typically need plans prepared by an Oregon-licensed architect or residential designer. Structural elements need engineer-stamped drawings.
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Submit through the Portland Development Hub Log into the Development Hub ePermitting portal, start a new residential addition permit, upload all documents, and pay the plan review deposit.
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Respond to plan review corrections BDS reviewers check zoning, structural details, energy code, and life safety. BDS sends correction notices through the portal. Respond with updated plans and resubmit each cycle.
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Pay remaining fees and receive the permit Once all reviewers approve, pay the remaining permit fees (including the Oregon state surcharge) and download the permit. Post it where it is visible on site before construction begins.
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Schedule inspections at required milestones Request inspections through the portal at the required stages, typically foundation, framing, insulation, and final. Trade inspections have their own milestones. Do not cover work before it is inspected.
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Pass final inspection and close the permit Passing all inspections closes the permit. Keep the paperwork for insurance, refinancing, and a future sale.
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Tools & materials
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Provenance
Code basis & official sources
Last verified 2026-05-07.
2022 Oregon Residential Specialty Code (ORSC) based on the 2021 IRC with Oregon amendments; Oregon Energy Code for energy compliance; Portland Zoning Code (Title 33) for land use and dimensional standards.
Residential permit page: https://www.portland.gov/bds/permits-and-zoning/online-permitting
If you skip the permit
- Portland BDS can issue a stop-work order and require removal of unpermitted work.
- A retroactive permit requires opening finished walls and framing for inspection.
- Portland home inspectors and mortgage lenders flag unpermitted additions, which can delay or block a sale.
- Insurance may deny claims tied to unpermitted living areas.
- Unpermitted square footage may not be counted in the appraised value of the home.
- Historic resource violations can force the owner to restore the property at their own expense.
FAQ
Common Portland addition permit questions
Do I need a permit to add a room to my house in Portland?
Yes, always. Any addition that increases the enclosed living area of a Portland residential building needs a building permit from BDS. Room additions have no size exemption.
How much does an addition permit cost in Portland?
Portland permit fees are based on valuation, plus a 12% Oregon state surcharge. A typical room addition costs an estimated $700–$2,500+ in combined fees. Trade permits are billed separately. Check current amounts at portland.gov/bds.
Does my house being in a Portland historic district affect my addition?
Yes, significantly. Additions to properties in Portland Historic Districts or Conservation Districts need Historic Resource Review (typically Type II) before building permits are issued. This adds time and may force design changes so the addition fits the historic character of the building.
How long does Portland plan review take for a room addition?
Standard residential addition review at BDS typically takes 4–8 weeks per review cycle. The whole project, including design, corrections, construction, and inspections, commonly takes 3–6 months.
What is the Oregon state surcharge on Portland permits?
Oregon law requires a 12% surcharge on most building permit fees statewide. Portland BDS collects it along with the city permit fee and sends it to the state. It applies to building, plumbing, mechanical, and electrical permits.
Do I need separate permits for electrical and plumbing in my Portland addition?
Yes. Electrical work needs a separate electrical permit under the Oregon Electrical Specialty Code. Plumbing needs a separate plumbing permit. HVAC extensions need a mechanical permit. You file all trade permits through Portland BDS alongside the main building permit.
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Disclaimer: Informational only, not legal advice. Rules change. verify with Portland permitting staff before you build.