Seattle ADU Builder Construction of a ADU unit in Seattle, WA. Home 9 New Construction 9 ADU 9 4430 47th Ave SW, Seattle, WA 98116 w Ask An Expert (206) 552-9791 4430B 47th Ave Custom design and construction of an Accessory Dwelling Unit (ADU) in Seattle, WA. SALE PRICE: TBD ADDRESS: 4430 B 47th Ave SW, Seattle, WA 98116 TYPE: ADU COMPLETION DATE: May, 2023 PHOTOS: Exterior Interior Aerial Exterior Photos Interior Photos Aerial Photos