Detached Garage Construction Cost in Portland, OR
Based on 355 detached garage construction building permits filed in Portland between 2017 and 2026, the typical declared project value is $30,455, with most landing between $20,000 and $60,000. These are real records from Portland's public building-permit data, declared job values, not contractor estimates or AI guesses.
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Detached Garage Construction values over time in Portland
Median declared value moved from $34,000 in 2021 to $24,500 in 2026, down 28% over that span. Each year below is computed from the filings that actually cleared in Portland.
Recent detached garage construction permits in Portland
Actual filings from Portland's public permit records. Declared job values, not final paid prices.
| Filed | Declared value | Work described |
|---|---|---|
| 2026-06-12 | $18,000 | SINGLE PDF - PARTIAL CONVERSION OF DETACHED GARAGE TO OFFICE SPACE. *** ANY ET PT OR MT SE |
| 2026-06-12 | $21,000 | SINGLE PDF- CONVERT EXISTING DETACHED GARAGE SHOP INTO OFFICE SPACE, REPLACE DOOR AND WIND |
| 2026-05-07 | $75,000 | SINGLE PDF CONVERT DETACHED GARAGE INTO ADU/ 1 STORY/ON SHARED LOT/ NO GARAGE/ FLAT LOT/ * |
| 2026-05-05 | $77,000 | *SINGLE PDF* ADDITION TO EXISTING DETACHED GARAGE PER CITY OF PORTLANDS REMODEL POLICY. |
| 2026-04-28 | $12,000 | SINGLE PDF-NEW 2ND STORY DECK WITH COVER AND EXTERIOR STAIRS. NEW GARAGE WINDOW, FINISH BA |
| 2026-04-16 | $50,000 | SINGLE PDF - CONVERT EXISTING DETACHED GARAGE TO ADU. INCLUDES KITCHEN, LIVING ROOM, DININ |
| 2026-03-31 | $12,000 | SINGLE PDF - CONVERT HALF OF DETACHED GARAGE TO HABITABLE SPACE FOR A BEDROOM/OFFICE WHILE |
| 2026-03-11 | $100,000 | SINGLE PDF - RETROACTIVE PERMIT TO CONVERT UPPER FLOOR OF EXISTING 2-STORY DETACHED GARAGE |
| 2026-03-06 | $8,000 | SINGLE PDF RETROACTIVE PERMITTING FOR DETACHED GARAGE CONVERTED TO AN ACCESSORY DWELLING U |
| 2026-01-21 | $25,000 | SINGLE PDF- REMODEL EXISTING DETACHED GARAGE TO STORAGE, REMOVE OVERHEAD DOOR, INSTALL NEW |
| 2026-01-10 | $50,000 | SINGLE PDF - FUR OUT BASEMENT TO CREATE HABITABLE SPACE INCLUDING A BEDROOM WITH EGRESS WI |
| 2026-01-09 | $30,000 | *SINGLE PDF* Remodel existing detached garage (built in 1990 with permit) to living space |
| 2026-01-07 | $10,000 | SINGLE PDF CONVERT DETACHED GARAGE TO NON-HABITABLE SPACE (NOT AN ADU). ADDING BATHROOM. |
| 2026-01-07 | $24,000 | *SINGLE PDF* SMALL ADDITION TO CONNECT DETACHED GARAGE TO DWELLING. CONVERT GARAGE TO LI |
| 2025-12-19 | $15,000 | SINGLE PDF - RETROACTIVE PERMIT TO CONVERT DETACHED GARAGE TO ADU. ROOMS INCLUDE KITCHEN, |
Paid for detached garage construction 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 detached garage construction 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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