Seattle
ADUniverse design gallery
The city is updating the gallery and guidance. Confirm availability and acceptance of the exact design before hiring its designer.
Open official plan resource ↗Read the local guide ↗Washington / Local ADU planning
Your ADU,
in Seattle.
Attached ADUs, backyard cottages and the current Seattle permit process.
The local starting point
Check current zoning and the ADUniverse gallery update. Account for sewer capacity charges and site conditions in your plan.
1 jurisdiction guides4 provider records
Start with the right permit office
Find your local guide.
Seattle city guide and Seattle provider research. Bellevue and other King County cities have separate rules and are not yet covered.
Explore the design options
Local plan programs.
A standard design still needs site-specific work. Program participation does not verify a builder’s current license.
Make a useful shortlist
Explore ADU providers.
Company websites and public permits provide different kinds of evidence. Listings are research starting points; confirm service area, credentials and availability directly.
Get ready for the first conversation
A clearer scope.
A more useful quote.
Build a budget with your own local estimates, then compare providers on design, site work, utilities and permit responsibilities.
Build your budget ↗Before you hire
Use the quote comparison checklist ↗Washington L&I contractor verification ↗Check the relevant professional board for architects and other separately licensed services.