ADU / DADU permits in City of Shoreline: fees, timeline & requirements (2026)
Everything you need to know about pulling a ADU / DADU permit in City of Shoreline, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Shoreline uses its own permit center..
When does a ADU / DADU need a permit in City of Shoreline?
WA HB 1337 (signed 2023, code-adoption deadline mid-2025) requires cities ≥6,000 pop. to permit ≥2 ADUs per lot in SF residential zones, allow ADUs of ≥1,000 sq ft (state floor — cities may allow larger, e.g. Bellevue/Redmond/Sammamish 1,200), drop owner-occupancy requirements, and waive parking requirements within ½ mi of frequent transit. City adoption status varies; local size + design caps may exceed the state floor.
Required submittals
- full architectural plans
- structural calcs
- WSEC compliance form
- site plan w/ setbacks
- sewer/water capacity certification
Inspection sequence
- footing
- foundation
- framing
- rough-in (electrical/plumbing/mechanical)
- insulation
- drywall
- final
Contractor specialties needed
general, electrical-01-or-02, plumbing, mechanical
Notes & caveats
Full IRC R-3 occupancy requirements: independent kitchen, bathroom, sleeping area. Egress (R310) on sleeping rooms. Independent address + utilities or shared with covenant. ADUs typically require sewer/water capacity verification.
How to apply
- 1. Confirm your parcel's zoning & overlays. Run an address lookup on the main permits page — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (5).
- 3. Submit through the city portal: Shoreline uses its own permit center. ↗
- 4. Track review (typical: 30–90 days). Respond to reviewer comments promptly.
- 5. Pay issuance fees (Full Construction Permit (Addition/Alteration) fees. Sewer capacity charges may apply (King County: ~$8k-$10k). Apply via https://www.shorelinewa.gov/government/departments/planning-community-development. Shoreline uses its own permit center.) and pick up the permit. Inspection card travels with the job.