Service area · Seattle, King County
Seattle is the service area — and here is every record we can read in it
Everything on this site is measured from City of Seattle and King County records for a parcel inside Seattle's city limits. That is not modesty, it is arithmetic: the zoning, critical-area, tree and utility layers the engine measures are City of Seattle services, and there is no Bellevue or Shoreline equivalent wired in. So the honest offer is a deep one in one city rather than a shallow one in thirty-nine.
Why the line is drawn at the city limits
The engine measures six families of City of Seattle layers, and every one of them ends where Seattle does. That is also why the address box refuses an out-of-area address instead of taking the money and producing a thinner report: a parcel in Bellevue comes back as outside the Seattle service area before any geocoding happens, and no payment is taken.
What Seattle's own records say about the housing stock here
Across the 18 neighborhoods profiled on this site — 92,120 parcels, measured from City of Seattle open data, not sampled — 55% of lots are 5,000 sq ft or larger and 45% are under 5,000. Seattle repealed the old 3,200 sq ft minimum lot area for a DADU, so the small lots are not excluded; they are governed by the floor-area budget instead, which is a very different conversation with a designer.
38% of the homes whose year built is recorded in those areas were built before 1940. That single number explains most of the surprises we find in the records: clay side sewers with root intrusion, buried heating-oil tanks that were never decommissioned under permit, and permits that exist only on SDCI microfilm from before 1970.
Ground varies more than the code does. Alki & Admiral carries 22.3% mapped steep slope against 1.9% in Wallingford, and Columbia City sits on 24.9% liquefaction-prone ground. Median tree canopy across the profiled areas is 26.9%, which is why the tree tiers decide siting as often as the setbacks do.
Your neighborhood, measured
Feasibility is a local question inside the city too: a 4,000 sq ft lot in Wallingford and a 9,000 sq ft lot in Wedgwood are governed by the same code and reach completely different answers. These 18 profiles are the same data, one area at a time.
Who owns the records, and where each one stops
The property dossier collects 15 sources. In Seattle all 15 apply. This is the same grouping that decides what any future city could offer on day one — the King County and Washington rows travel; the City of Seattle rows do not.
City of Seattle only · 9 of 15
All of King County · 4 of 15
Statewide (Washington) · 2 of 15
Read these before you spend anything
Each one is free, written for Seattle's code, and answers a question that comes up in every report.
Measure your own Seattle lot
Both start from your address and stop at the city limits, because that is where the data does.
If the property is not in Seattle
We would rather say so than sell you a report built on layers that do not cover your parcel. The service-area page lists every King County city and town, what "not served" actually means source by source, and what a city needs before it can go live here.