Legalizing an Unpermitted Basement, Attic or Garage Conversion in Portland

Portland Permitting and Development is direct about it: if you have a finished attic or basement that was not permitted, it will need to become permitted, and you apply for the same permits as if the work had not been done yet. The same applies to a garage turned into a bedroom, office or living area.

First, check the record

Before assuming the work is unpermitted, check the permit history through inspection cards, old plans and the City's online records. The City says to verify permit records and not rely on county tax information, which often lists finished space that was never permitted.

What the permit needs

• A building permit for the conversion, plus electrical, plumbing or mechanical trade permits where that work was done.

• A site plan and architectural plans showing the space as it exists and any changes needed to meet code.

• Structural calculations where the scope requires them, such as new openings, removed walls or a detached garage that needs upgrades.

• Major Residential Alteration and Addition rules where the project qualifies, which add a delay period and neighbor notification.

Where existing spaces usually fall short

• Ceiling height. Unfinished areas often do not meet current ceiling height requirements. The City's Habitable Space Code Guide sets out alternative standards for existing spaces.

• Emergency escape openings. Sleeping rooms need an emergency escape and rescue opening. A basement bedroom without one is the most common failure.

• Insulation and ventilation. Walls, floors and ceilings built as unconditioned space rarely meet energy and ventilation rules.

• Fire separation. Outside walls within three feet of a property line need fire rated construction, except along a public right of way.

Garage conversions

• Off street parking is not required in Portland, but if you remove a garage parking space you must show a replacement space outside required setbacks. Driveway parking alone may not meet the location rule.

• Detached garages may need structural upgrades, and every structural element can come under review.

• Driveway or right of way changes may need Portland Bureau of Transportation review and a right of way permit.

Converting to an ADU instead

If the space has its own kitchen and entrance, the City reviews it as an accessory dwelling unit, with different rules and fees. Decide the end use before drawings start, because it changes the whole set.

Common questions

Can I get a permit for a basement that was already finished?

Yes. Portland requires the same permits as if the work had not been done, and the space must meet the code for new work, with the alternative standards the City allows for existing spaces.

Will I have to open walls?

Often, in part. Inspectors need to see framing, wiring, plumbing and insulation. The extent depends on what can be documented and what the inspector accepts.

Do I need to replace garage parking?

Off street parking is not required, but if you remove a garage space you must show a replacement space outside required setbacks.

Can the county tax record prove the space is permitted?

No. The City says to verify permit records directly and not rely on tax information from the county.

How SASHKOV handles it

• Measures and documents the space as built, including structure and openings.

• Confirms what the space must meet, including ceiling height, escape openings, fire separation and parking.

• Prepares the permit set and brings in the structural engineer where the scope needs one.

• Coordinates trade permits and carries the legalization permit through inspection to final.

Where a building requires a licensed architect or engineer of record, SASHKOV brings them into the contract.

For the full legalization process, see Permit Legalization and Stop-Work Resolution. For stop-work orders, read Stop-Work Orders and Unpermitted Work in Portland.

Have finished space that was never permitted? Send the address and a few photos, and SASHKOV will map the path to a permit in business days.