ADUs and Backyard Cottages
Detached and attached ADUs for family, guests or rental income, from permit to move-in.
Typical range
$280,000 to $450,000+
Most clients spend
$320,000 to $380,000
Typical timeline
6 to 9 months after permit
From feasibility to move-in
Seattle allows backyard cottages on most single-family lots, but every lot has its own limits. We start with a feasibility check, then design, permit and build under one contract.
Utility connections are where ADU budgets usually move. We price them early, after looking at where your sewer and power actually run.
What’s included
A feasibility check for your lot
Design and the permit set
Sewer, water and power connections
Foundation to finishes
Kitchen and bath
Final inspection and certificate of occupancy
What moves the price
Distance to sewer and power
Size and number of bedrooms
Slope and access to the backyard
Finish level
Utility upgrades at the main house
Recent projects
