Detached Garage Construction Cost in Seattle, WA
Based on 968 detached garage construction building permits filed in Seattle between 2015 and 2026, the typical declared project value is $31,752, with most landing between $20,000 and $60,000. These are real records from Seattle'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 Seattle
Median declared value moved from $37,000 in 2021 to $39,500 in 2026, up 7% over that span. Each year below is computed from the filings that actually cleared in Seattle.
Recent detached garage construction permits in Seattle
Actual filings from Seattle's public permit records. Declared job values, not final paid prices.
| Filed | Declared value | Work described |
|---|---|---|
| 2026-06-11 | $11,000 | Construct alterations to remove existing detached garage accessory to one-family dwelling |
| 2026-06-08 | $35,000 | Construct detached garage accessory to existing one-family dwelling per plan. |
| 2026-05-27 | $17,323 | Construct detached garage accessory to existing one family residence subject to field ins |
| 2026-05-26 | $55,000 | Rebuild existing detached garage in kind for one family dwelling per SMC 23.42.112 subjec |
| 2026-05-25 | $50,000 | Demolition and reconstruction of an existing non-conforming detached garage in kind per SM |
| 2026-05-15 | $83,402 | [Establish new detached accessory dwelling unit] Construct new one family dwelling per pl |
| 2026-05-12 | $41,576 | Construct new detached garage for existing one-family dwelling per plan. (Establish use a |
| 2026-05-11 | $100,000 | "Construct substantial alterations to existing detached garage to create a studio subject |
| 2026-05-07 | $40,000 | Construct new detached carport addition accessory to existing one family dwelling per pla |
| 2026-04-01 | $28,872 | Construct new detached garage structure site work and alterations to existing one family |
| 2026-03-30 | $41,576 | Construct new detached accessory garage for existing single-family dwelling unit per plan |
| 2026-03-25 | $45,040 | Construct new detached garage accessory to one family dwelling per plan. |
| 2026-03-25 | $45,473 | Construct new prefabricated detached garage accessory to existing one family dwelling per |
| 2026-03-23 | $10,000 | Bathroom addition to detached garage in one dwelling unit subject to field inspection. |
| 2026-03-19 | $30,000 | Construct deck and repairs to detached garage at existing single family residence subject |
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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 Seattle comes down to home size, materials, and scope.
Where this comes from
Every figure is pulled from Seattle's public building-permit records and classified by the work described. Nothing is estimated or AI-generated. How the data works. The moment a Seattle homeowner adds a real receipt, this page upgrades to show what neighbors actually paid next to these permit values.
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