Puget Sound permit directory
Every city · every county · every utility
The single page we wish existed when we started building in Seattle. Direct links to the permit center, zoning code, and reviewing department for every city we work in — plus county assessors, utility providers, and the state building, energy, and ADU laws that govern what gets approved.
Maintained by Golden State ADU Builders, a WA-licensed general contractor (license GOLDNAB882L2). If a link rots, email office@golden-adu.com.
King County
Pierce County
Snohomish County
Thurston County
County assessors & property records
Use the county assessor to confirm lot dimensions, recorded easements, and current land use before designing an ADU or addition. We pull from these directly during $1,500 feasibility.
Power, water & sewer providers
Electrical service upgrades, water-meter sizing, and side-sewer capacity often drive ADU and remodel scope more than the floor plan. Confirm provider rules early.
Washington building, energy & housing law
Every Puget Sound jurisdiction adopts the Washington State Energy Code (WSEC) and the state ADU and middle-housing statutes on top of its local zoning. These are the governing documents.
- Source ↗WSEC 2021 Residential Energy CodeEnvelope, HVAC, hot-water and air-sealing requirements
- Source ↗WA HB 1110 — Middle housing lawStatewide middle-housing zoning preemption
- Source ↗WA HB 1337 — ADU statewide rulesTwo-ADU baseline, no owner occupancy, parking limits
- Source ↗WA Dept. of Commerce — ADU resources
License, bonding & insurance verification
Before signing any contract in Washington — with us or anyone else — verify the contractor's WA L&I license, bond, and insurance status. It takes 30 seconds and is the single best protection you have.
Permits are paperwork.
Building is what we do.
If you want a builder who actually knows the difference between Seattle SDCI, Bellevue DSD, and Pierce County PALS — we are licensed in all of them and build in all of them, every week.
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