Local authority
How to verify zoning in Seattle.
Seattle zoning is administered under Title 23 of the Municipal Code, with the Land Use Code split between the base zone and any overlay — shoreline, historic district, or urban village — that applies on top of it. Read the base zone for permitted uses and development standards, then check the overlay layers, because in Seattle the overlay is usually what constrains height and setbacks rather than the base zone.
- Current Land Use Zoning Detail (GIS service) — City of SeattleVerified · The authoritative published zoning layer; this is the service our zoning read queries.
- Seattle Municipal Code (Title 23 Land Use Code) — City of SeattleVerified · Check recently passed ordinances not yet codified before relying on the hosted text.
- Permits — Seattle SDCIVerified
- Contact Us — Seattle SDCIVerified
Official determination: The Seattle Department of Construction and Inspections (SDCI) is the authority for official zoning interpretations and permit decisions.
What decides buildability here
The factors that matter in Washington.
A preliminary report organizes these nine factors. Available data and local depth vary by address, source, and jurisdiction.
USGS seismic design categories drive structural cost — the same lot can pencil differently a few miles apart.
USFS Wildfire Hazard Potential shapes both insurability and code requirements at the urban edge.
Local zoning sets the envelope — height, coverage, density, setbacks — and it is where most projects are actually won or lost.
How it works
Available data, one preliminary view.
Buildability geocodes the address, queries available flood, seismic, soil, radon, wildfire, and zoning context, and runs the published Buildability Score. Reports name the sources used and the items that still need local verification.
Building in Seattle, WA.
How do I verify zoning for a property in Seattle?
Seattle zoning is administered under Title 23 of the Municipal Code, with the Land Use Code split between the base zone and any overlay — shoreline, historic district, or urban village — that applies on top of it. Read the base zone for permitted uses and development standards, then check the overlay layers, because in Seattle the overlay is usually what constrains height and setbacks rather than the base zone. The Seattle Department of Construction and Inspections (SDCI) is the authority for official zoning interpretations and permit decisions.
Which official Seattle sources should I check?
Start with Current Land Use Zoning Detail (GIS service), Seattle Municipal Code (Title 23 Land Use Code), Permits, Contact Us. The source links and their verification dates appear above.
Does Buildability make the official zoning decision in Seattle?
No. Buildability organizes preliminary property context and links to local evidence. The Seattle Department of Construction and Inspections (SDCI) is the authority for official zoning interpretations and permit decisions.
What does the Buildability Score measure?
The preliminary score considers nine factors: zoning, flood, seismic, soil, radon, wildfire, utilities, terrain, and lot geometry. Availability and depth vary by address and source; City of Seattle remains the local authority for project-specific decisions.
More of Washington.
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Start a property check in Seattle.
The live Score is free on any address. The full report is $99, and reports never expire.
No credit card · Available sources shown
Buildability Scores are an informational planning estimate from public data — not an appraisal, engineering opinion, or official zoning determination. Verify with your local jurisdiction before making a decision. Terms.