Jurisdiction file · Washington
What Seattle pays, by the filings
4,044 permits across 11 kinds of work, filed over the last two years. Every figure is what somebody actually declared to Seattle — no estimates.
| Project | Median | Typical range | Permits |
|---|---|---|---|
| Home Addition | $150,000 | $61,000 – $256,106 | 1,197 |
| ADU / Guest House | $219,202 | $188,578 – $501,861 | 1,195 |
| Roof Replacement | $19,170 | $13,795 – $26,521 | 535 |
| Garage | $51,271 | $25,000 – $158,941 | 316 |
| Deck or Patio | $20,000 | $10,142 – $41,947 | 266 |
| Kitchen Remodel | $50,000 | $30,000 – $100,000 | 151 |
| Bathroom Remodel | $30,000 | $15,000 – $50,000 | 143 |
| Foundation Repair | $26,000 | $17,000 – $43,000 | 125 |
| Interior Remodel | $55,000 | $22,250 – $114,250 | 54 |
| Window Replacement | $13,515 | $7,983 – $31,901 | 34 |
| Swimming Pool | $75,000 | $28,750 – $186,814 | 28 |
What the file shows
Home Addition is the work Seattle files most: 1,197 of these 4,044 permits, 30% of the file. The dearest median here is ADU / Guest House at $219,202; the cheapest is Window Replacement at $13,515.
The figure to read is not the median but the range next to it. Swimming Pool is the least predictable work in this jurisdiction: half of those jobs land between $28,750 and $186,814, a 6.5× spread inside one city and one kind of work. A median says where the middle sits. It does not say which half a particular job is in, and on work that varies this much the difference is the whole decision.
Source: City of Seattle SDCI — Building Permits. Updated 2026-09-24. Methodology.