Go Far®ADU & DADU builder · Bellevue
ADU & DADU builder for Bellevue.
On the Eastside, the land under a house is often worth more than the house — and an accessory dwelling unit is how Bellevue homeowners put that land to work. Go Far Construction builds permitted, finished second units across Bellevue: ground-up backyard cottages, basement apartments, garage conversions, and attached ADUs, from a family-owned, licensed Washington general contractor.
Washington’s ADU law — HB 1337 — requires cities inside urban growth areas to allow two accessory dwelling units per residential lot, and Bellevue permits both attached ADUs and detached ADUs (DADUs). Exact size, height, and siting numbers are zone-specific, so we confirm your lot’s numbers with City of Bellevue Development Services 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. With Bellevue rents among the strongest in the state, the rental math here is some of the best we see; ADU financing options covers how owners fund the build.
We build every route to a second unit: basement ADU conversions, garage conversions, attached mother-in-law suites, and ground-up DADUs. Permits run through City of Bellevue Development Services; we prepare the application, carry fees in an itemized written price, and meet every inspector on site, as on all our Bellevue projects.
What we build in Bellevue
Bellevue ADU questions
How much does it cost to build an ADU in Bellevue?
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. Every project gets an itemized written estimate before design is finalized.
How many ADUs does Bellevue allow on a lot?
Under Washington’s HB 1337, cities inside urban growth areas must allow two accessory dwelling units per residential lot, and Bellevue permits both attached and detached units. Size, height, and siting limits are zone-specific, so we confirm your lot’s exact numbers with City of Bellevue Development Services before design begins.
Does an ADU pencil as a rental in Bellevue?
Bellevue rents are among the strongest in Washington, which is why Eastside ADUs have some of the best rental math we see — a backyard cottage or basement apartment can carry a meaningful share of its financing cost. It’s also the most popular way to house family nearby: parents, returning graduates, or a long-term guest suite.
How long does an ADU project take in Bellevue?
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. Design and permitting add time ahead of construction — our ADU timeline guide breaks the full sequence down stage by stage.
Plan your project
Costs, rules, and timelines for Eastside ADU projects: ADU costs · DADU costs · ADU timelines · ADU vs. DADU · ADU financing · HB 1337 explained · Seattle ADUs · Lynnwood ADUs · Kirkland ADUs · Everett ADUs · our Bellevue page