Pre-Approved Standard-Plan DADU Permits in City of Seattle
Seattle SDCI maintains a library of pre-approved DADU plans. Choosing one cuts permit review from typical 6–9 weeks down to ~3–4 weeks because the architectural and structural review is already complete.
Drops the placement canvas on your parcel for pre-approved standard-plan dadu scope. Live setback + coverage + easement checks; packet generation when you’re ready.
Permit fees in City of Seattle
Fee schedule not yet aggregated — check the City of Seattle fee schedule directly.
City of Seattle fee scheduleConstruction Permit (Addition/Alteration). Pay 75% of plan-review + permit fees at application acceptance. See 2026 Fee Estimator + Director's Rule 5-2025. Pre-approved DADU plans waive most plan-review fees.
Review timeline
Typical: 14–84 business days
Pre-approved plans skip architectural + structural review. Plans examiner only verifies placement + site work.
How Seattle’s pre-approved program works
- Pick a plan from Seattle SDCI’s pre-approved library (~14 plans as of 2026). Each has architect-stamped drawings, structural calcs, and energy compliance pre-approved.
- Generate a placement packet — only the site-specific items (A1.1 site plan, drainage, tree protection) need fresh review.
- Submit to SDCI’s expedited queue (~3–4 weeks typical vs 6–9 for custom).
- Build — standard inspections apply.
The placement canvas on the parcel page will pre-load the chosen template’s footprint dimensions, so you just position + rotate.