Go Far®ADU & DADU builder · Edmonds
ADU & DADU builder for Edmonds.
Edmonds opened the door to second units — two ADUs are now allowed on a single lot, detached cottages can reach 1,000 to 1,200 square feet depending on zone, and in summer 2026 the city launched a pre-approved DADU design program to speed up permits. Go Far Construction builds permitted, finished ADUs across Edmonds: ground-up backyard cottages, basement apartments, garage conversions, and attached units, from a family-owned, licensed Washington general contractor based ten minutes away in Lynnwood.
Washington’s ADU law — HB 1337 — set the statewide floor, and Edmonds brought its code in line in 2024: two accessory units per lot, with detached ADUs up to 1,000 or 1,200 square feet depending on the zone. In summer 2026 the city went a step further and launched a pre-approved DADU design catalog — plans that have already cleared city review, priced at no more than $1,000, that shave review time off a permit. 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. Edmonds’ sloped and view lots take extra siting care, and that’s exactly the work we price up front; ADU financing options covers how owners fund the build.
We build every route to a second unit: basement conversions under Bowl cottages and hillside homes in Seaview, Westgate, and Firdale, garage conversions, attached mother-in-law suites, and ground-up DADUs — from a catalog plan or a custom design shaped to the slope and the view. Permits run through the City of Edmonds; we prepare the application, carry fees in an itemized written price, and meet every inspector on site, as on all our Edmonds projects.
What we build in Edmonds
Edmonds ADU questions
How much does it cost to build an ADU in Edmonds?
Basement ADU conversions and garage 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 — Edmonds’ sloped and view lots can add site-work cost, which is exactly what we price before design is finalized. Every project gets an itemized written estimate.
What are the ADU rules in Edmonds?
Edmonds updated its code in 2024 to match Washington’s statewide ADU law — HB 1337: two accessory dwelling units are allowed on a single lot, and detached ADUs can be up to 1,000 or 1,200 square feet depending on the zone. What fits on your specific parcel still depends on lot coverage, setbacks, and any critical areas — common on Edmonds’ slopes — so we confirm your lot’s numbers with the city before design begins.
Does Edmonds have pre-approved ADU plans?
Yes — Edmonds launched a pre-approved DADU design program in summer 2026. Designs accepted into the catalog have already been through city plan review, plan prices are capped at $1,000, and using one trims review time off the permit. The catalog is still growing, so we’ll check what’s available for your lot — and a custom design remains the right answer for many view and sloped properties.
How long does an ADU project take in Edmonds?
Conversions of existing space typically run two to four months of construction after permits; ground-up DADUs run six to ten months including site work. Edmonds reviewed about 40 ADU applications in 2025, and the new pre-approved plan program is designed to shorten review further. We prepare and track the application either way.
Plan your project
Costs, rules, and timelines for Edmonds ADU projects: ADU costs · DADU costs · Washington’s ADU law · ADU timelines · ADU financing · Lynnwood ADUs · Everett ADUs · Kirkland ADUs · Shoreline ADUs · our Edmonds page