Go Far®ADU & DADU builder · Mill Creek
ADU & DADU builder for Mill Creek.
Mill Creek’s established neighborhoods — mature trees, real yards, forty years of landscaping — are exactly where a second unit earns its keep, and Washington’s ADU law now guarantees the right to build one on most residential lots. Go Far Construction builds permitted, finished ADUs across Mill Creek — ground-up backyard cottages, attached in-law suites, and garage conversions — from a family-owned, licensed Washington general contractor based ten minutes away in Lynnwood.
Washington’s ADU law — HB 1337 — sets the statewide floor cities had to meet by mid-2025: two accessory units allowed on most residential lots, no owner-occupancy requirement, and ADUs of at least 1,000 square feet permitted. What fits on your Mill Creek parcel still comes down to zoning, lot coverage, and setbacks — and in many neighborhoods a homeowners association with its own design standards — so we confirm the numbers with the City of Mill Creek before design begins. Our ADU vs. DADU guide walks through which route fits which lot.
On budget: basement ADU conversions and garage 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 ADU financing options covers how owners fund the build. In Mill Creek the strongest case is often family: a parent’s cottage or an adult child’s first apartment, steps from the main house — and the rental side pencils too, minutes from Everett’s job centers and the I-5 corridor.
We build every route to a second unit: garage conversions, attached mother-in-law suites, and ground-up DADUs in the generous backyards of the original subdivisions. Permits run through the City of Mill Creek; we prepare the application, carry fees in an itemized written price, and meet every inspector on site, as on all our Mill Creek projects.
What we build in Mill Creek
Mill Creek ADU questions
How much does it cost to build an ADU in Mill Creek?
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. Every project gets an itemized written estimate before design is finalized.
How many ADUs does Mill Creek allow on a lot?
Washington’s statewide ADU law, HB 1337, required cities to allow two accessory units on most residential lots by mid-2025, with no owner-occupancy requirement. Exactly what fits on your parcel depends on zoning, lot coverage, and setbacks, so we confirm the numbers with the City of Mill Creek before design begins.
Can I build a backyard cottage in one of the original Mill Creek neighborhoods?
Usually yes — the original subdivisions have some of the most workable lots in the city, with real backyard depth. Two things get checked early: the city’s zoning numbers (coverage, setbacks, height) and, in many neighborhoods, homeowners association design standards that apply alongside city code. We run both before any design money is spent.
Do you handle the Mill Creek permits and inspections?
Yes — we prepare the City of Mill Creek application, include permit fees in your itemized written estimate, and meet every inspector on site from foundation to final.
Plan your project
Planning a Mill Creek ADU? Useful next reads: ADU costs · DADU costs · Washington’s ADU law · ADU financing · our Mill Creek page · all of Snohomish County