Seattle DADU Custom homes, apartments, backyard cottages & ADU/DADU units. Home » Completed Projects » 9449 B 5th Ave SW, Seattle, WA 98106 w Ask An Expert (206) 552-9791 9449 B 5th Ave Detached Additional Dwelling Unit (DADU) is a 1,000 square feet backyard cottage. CONSTRUCTION COST: $250,000 ADDRESS: 9449 5th Ave SW, Seattle, WA 98106 TYPE: Backyard Cottage COMPLETION DATE: September 2020
