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Remodeling Costs in Seattle, Washington
What remodeling actually costs in Seattle, Washington — computed from 2026 real building permits the city has issued in the last 24 months, not from contractor marketing surveys.
Updated November 2026 · next refresh December 2026 · computed from permits issued through November 2026.
Urbarama began by documenting architecture; this index is the other side of the same subject — what architecture and construction actually cost, read from the permits themselves.
Every figure on these pages comes from a declared permit value: the job cost the applicant reported to the City of Seattle when the permit was filed. We publish the median and the middle-half range for each project type, with the permit count behind every number. Declared values tend to understate final invoices, so read them as a floor and a planning anchor — the methodology is on each page.
When you move from costs to quantities, start by measuring the space with the square footage calculator — almost every material estimate keys off it. Outdoor work runs through the gravel calculator for base and drainage, and anything that sits on a foundation starts with the pour math in the concrete slab calculator.
Kitchen Remodel Cost in Seattle
Median $50,000 · typical range $25,000–$99,000 · 140 permits.
Cost GuideBathroom Remodel Cost in Seattle
Median $28,000 · typical range $15,000–$45,000 · 130 permits.
Cost GuideDeck Build Cost in Seattle
Median $22,193 · typical range $10,935–$50,000 · 404 permits.
Cost GuideHouse Addition Cost in Seattle
Median $150,000 · typical range $64,982–$250,000 · 884 permits.
Cost GuideADU / DADU Cost in Seattle
Median $183,517 · typical range $93,678–$211,607 · 437 permits.
Cost GuideBasement Finish Cost in Seattle
Median $50,000 · typical range $17,500–$97,500 · 31 permits.
More project types are added only when at least 30 permits support them — no thin pages built on a handful of records. Cost guides for more cities follow the same rule.
Download and cite this data
Download the data (CSV) — the full Seattle table: every project type with its permit count, median, percentiles and period covered.
Cite this data: “Urbarama Remodeling Cost Index — Seattle, computed from City of Seattle building permit records (Seattle Open Data, data.seattle.gov), updated November 2026.” Source data: City of Seattle issued building permits, published through the Seattle Open Data portal.
About the author
Harrison Alley is a web publisher and data enthusiast based in Dallas, Texas. He built Urbarama’s remodeling calculators and maintains them.
Harrison Alley on LinkedIn