Basement Finishing Cost in Portland, OR
Based on 280 basement finishing building permits filed in Portland between 2017 and 2026, the typical declared project value is $24,658, with most landing between $16,000 and $50,000. These are real records from Portland's public building-permit data, declared job values, not contractor estimates or AI guesses.
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Basement Finishing values over time in Portland
Median declared value moved from $33,852 in 2021 to $35,000 in 2026, up 3% over that span. Each year below is computed from the filings that actually cleared in Portland.
Recent basement finishing permits in Portland
Actual filings from Portland's public permit records. Declared job values, not final paid prices.
| Filed | Declared value | Work described |
|---|---|---|
| 2026-06-05 | $30,000 | SINGLE PDF - REMODEL UPPER LEVEL BEDROOM AND TWO BATHROOMS (NO NEW BATHROOMS). ADD NEW STA |
| 2026-06-01 | $17,500 | SINGLE PDF - REMODEL EXISTING FINISHED DAYLIGHT BASEMENT, REMOVE EXISTING AND ADD NON-LOAD |
| 2026-05-20 | $95,000 | SINGLE PDF. Partial basement finish, add legal bedroom, full bathroom and family room. All |
| 2026-05-18 | $60,000 | SINGLE PDF. LEGALIZE FINISHED BASEMENT. |
| 2026-05-06 | $10,000 | SINGLE PDF - LEGALIZE EXISTING FINISHED BASEMENT, WITH 2 NEW WINDOW WELLS. LEGALIZE 2 EXIS |
| 2026-04-06 | $22,300 | *SINGLE PDF* CREATE A NEW PRIMARY BATHROOM(3rd) IN EXISTING FINISHED ATTIC, AND CREATE A |
| 2026-03-30 | $80,000 | SINGLE PDF - CONVERT UNFINISHED BASEMENT TO HABITABLE SPACE TO INCLUDE 2 BEDROOMS, 1 BATHR |
| 2026-03-17 | $30,000 | SINGLE PDF. Convert partial basement space to finished storage |
| 2026-03-02 | $70,000 | SINGLE PDF- REMOVE ATTACHED GARAGE, FINISH BASEMENT TO INCLUDE TWO BEDROOMS WITH EMERGENCY |
| 2026-02-17 | $20,000 | SINGLE PDF-ADD BATHROOM (2 TOILETS TOTAL) IN UNFINISHED BASEMENT*COMBO* |
| 2026-02-09 | $40,000 | *SINGLE PDF* CREATE A NEW BASEMENT BATHROOM(4th) AND WET BAR IN EXISTING FINISHED BASEMEN |
| 2026-01-29 | $50,000 | *SINGLE PDF* REMODEL EXISTING FINISHED BASEMENT. CREATE A BEDROOM WITH EGRESS WINDOW, AND |
| 2026-01-28 | $8,000 | SINGLE PDF. Legalize basement. Basement was illegally finished as an ADU by previous owner |
| 2026-01-07 | $75,000 | *SINGLE PDF* CONVERT UNFINISHED BASEMENT TO HABITABLE SPACE. CREATE TWO NEW BEDROOMS, TV |
| 2025-11-19 | $24,500 | *SINGLE PDF* REMOVE WALL BETWEEN KITCHEN AND DINING ROOM. REMODEL EXISTING FINISHED BASE |
Paid for basement finishing in Portland? Your receipt becomes the first real neighbor price on this page.
Add your price →How to read these numbers
A permit's declared value is the job cost the owner or contractor stated when they pulled the permit. It tracks the real cost of the work but can run a bit under what was actually paid, since it often leaves out some labor and finish costs. Treat the range as a grounded starting point. What basement finishing actually costs in Portland comes down to home size, materials, and scope.
Where this comes from
Every figure is pulled from Portland's public building-permit records and classified by the work described. Nothing is estimated or AI-generated. How the data works. The moment a Portland homeowner adds a real receipt, this page upgrades to show what neighbors actually paid next to these permit values.
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