We build across
the Puget Sound.

Service area — frequently asked

• Where does Golden State ADU Builders work?

  We serve the four-county Puget Sound region: King, Pierce, Snohomish, and Thurston. That covers ~32 incorporated cities and the unincorporated county pockets in between — from Olympia north to Everett and Mukilteo, and east to Sammamish, Issaquah, and Snoqualmie's western fringe. We do not take work east of Snoqualmie Pass or south of Centralia.

  Go deeper: Read the Puget Sound ADU timeline guide: kickoff to keys guide→

• Do you charge more for far-out projects?

  No premium within our core service area. We do add an honest mobilization line item for projects on Vashon Island, Bainbridge, and the Key Peninsula — primarily ferry/water-taxi cost and crew downtime, typically $4–9K depending on duration. We disclose this in the feasibility report so the all-in number is real.

  Go deeper: Explore General Contracting→

• Do you work in unincorporated King County?

  Yes. Unincorporated King County falls under King County DLS for permitting and has its own ADU rules under KCC 21A.08.030 with statewide HB 1337 floor. Permit timelines run 10–16 weeks. We have current jobs in Vashon, Skyway, and White Center; the rule patterns differ enough from Seattle SDCI that experience matters.

  Go deeper: Glossary: King County Capacity Charge→

• Do you work in Pierce County outside Tacoma?

  Yes — Puyallup, Gig Harbor, University Place, Lakewood, DuPont, Steilacoom, and unincorporated Pierce (Pierce County PALS permitting). Pierce County impact fees and side-sewer rules differ from King County, and Tacoma Power vs. PSE electrical service rules can shift schedule. We have built across all of these submarkets.

  Go deeper: Read the Cold-weather concrete pours in the Puget Sound (2026 field guide) guide→

• What about Bainbridge, Bremerton, and the Olympic Peninsula?

  We selectively take Bainbridge Island work when scheduling and ferry logistics align. We do not regularly build in Bremerton, Port Orchard, or further west onto the Olympic Peninsula — the haul kills both schedule and warranty response. We can refer you to two trusted Kitsap County ADU builders on request.

  Go deeper: Glossary: ECA (Environmentally Critical Area)→

• Can you build in rural / acreage settings?

  Yes, with caveats: well and septic add 6–10 weeks for permit (Public Health – Seattle & King County, or the relevant Health Jurisdiction) and $25–50K to budget. Power can require a new transformer ($5–18K from PSE). Internet/cell coverage drives smart-home limits. Rural builds usually only pencil on lots ≥1 acre with existing utilities partially in place.

  Go deeper: Explore New Home Construction→

• Do you handle islands (Mercer, Vashon, Bainbridge)?

  Mercer Island is in our standard service area. Vashon and Bainbridge are case-by-case based on schedule and ferry constraints — we charge an honest mobilization premium that we disclose in feasibility. We do not work on Maury Island or further south islands due to commute and warranty response time.

  Go deeper: Read the Eastside deck cost & permits: cedar, IPE, composite (2026) guide→

• Can you take projects in Pierce/Thurston with a Seattle PM?

  Yes — our PMs are licensed and trained across all four counties' permit systems. The PM typically lives within 60 minutes of the site and does in-person Friday walks plus daily Procore log updates. A Bellevue-based PM running a Tacoma project would not work; we assign by geography.

  Go deeper: Read the Cold-weather concrete pours in the Puget Sound (2026 field guide) guide→

• Do you ever subcontract to other ADU builders outside your area?

  Almost never. If your project is outside our service area, we refer you to a vetted GC in that submarket rather than sub-contract through us — sub-tier control is worse for you and warranty exposure is worse for us. The two exceptions are Bainbridge and Kitsap-side work where we partner with one trusted local crew.

  Go deeper: Read the Puget Sound ADU timeline guide: kickoff to keys guide→

• How do I know if my city is in your service area?

  Fastest check: visit our /service-area page or call with the address. We will confirm county, AHJ, current permit timeline, and any sub-area gotchas (Mercer Island critical areas, Tacoma sewer side-sewer rules, Olympia historic overlay) in one short call.

  Go deeper: Glossary: ECA (Environmentally Critical Area)→