Go Far®ADU & DADU builder · Mukilteo
ADU & DADU builder for Mukilteo.
Mukilteo rewrote its ADU chapter in 2025 to meet Washington’s two-unit law, and the terms are workable: up to two accessory units on a single-family lot, up to 1,000 square feet of living space, and a clear path for units over garages. Go Far Construction builds permitted, finished ADUs across Mukilteo — ground-up backyard cottages, garage ADUs, and attached in-law suites — from a family-owned, licensed Washington general contractor with 12+ years across Snohomish and King counties.
Washington’s ADU law — HB 1337 — sets the statewide floor, and Mukilteo’s updated code (chapter 17.30, revised in 2025) spells out the local terms: up to two ADUs on a single-family lot, up to 1,000 square feet of habitable space each, heights to 24 feet — or the zone’s height for a unit over a garage — one driveway per lot, and no new frontage improvements required. What fits on your parcel still comes down to zoning, lot coverage, and setbacks, which we confirm with the City of Mukilteo before design begins. Our ADU vs. DADU guide walks through which route fits which lot.
On budget: garage conversions and interior conversions in this market generally land between $100,000 and $250,000 depending on the starting condition of the space, while a new-build detached cottage typically runs $250,000 to $450,000 including site work, utilities, and soft costs. The full math lives in our ADU cost guide and DADU cost guide, and the rental side pencils well in a ferry town minutes from Boeing’s Everett plant and Paine Field — ADU financing options covers how owners fund the build.
We build every route to a second unit: garage ADUs — a natural fit on Harbour Pointe’s garage-forward lots — attached mother-in-law suites, and ground-up DADUs where the yard allows. On sloped and view lots we design around the grade and the sightlines rather than against them. Permits run through the City of Mukilteo; we prepare the application, carry fees in an itemized written price, and meet every inspector on site, as on all our Mukilteo projects.
What we build in Mukilteo
Mukilteo ADU questions
How much does it cost to build an ADU in Mukilteo?
Garage conversions and interior conversions generally land in the $100,000–$250,000 range depending on the starting condition of the space. A new-build detached ADU (backyard cottage) typically runs $250,000–$450,000 including construction, site work, utility connections, and soft costs — sloped and view lots can add site work. Every project gets an itemized written estimate before design is finalized.
How many ADUs does Mukilteo allow on a lot?
Mukilteo’s code allows up to two accessory dwelling units on a single-family residential lot, in line with Washington’s statewide ADU law, HB 1337. Each unit can have up to 1,000 square feet of habitable space. Exactly what fits on your parcel depends on zoning, lot coverage, and setbacks, so we confirm the numbers with the City of Mukilteo before design begins.
Can we build an ADU over our garage?
Yes — Mukilteo’s code addresses units over garages directly, allowing them to the underlying zone’s height rather than the standard 24-foot ADU limit. It’s one of the most space-efficient routes to a second unit on Harbour Pointe’s garage-forward lots, since it adds living space without giving up yard.
Do you handle the Mukilteo permits and inspections?
Yes — we prepare the City of Mukilteo application, include permit fees in your itemized written estimate, and meet every inspector on site from foundation to final. The code requires a separate address for the ADU and keeps the lot to one driveway — details we handle as part of the application.
Plan your project
Planning a Mukilteo ADU? Useful next reads: ADU costs · DADU costs · Washington’s ADU law · ADU financing · our Mukilteo page · all of Snohomish County