A DADU in Seattle is a Detached Accessory Dwelling Unit. You may have seen more of these pop up since they were approved in 2019. You will generally find them off of alleys or behind the main house. Here is the general criteria to build a DADU in Seattle:
Minimum lot size of 3200 SF
Minimum lot width of 25’ and 70’ lot depth
Up to 18’ heigh plus roof pitch
Up to 1000 SF of living space
Owners can rent them and even sell them separately if the lot is converted to a condominium.
See if your lot qualifies with this interactive tool at https://aduniverse-seattlecitygis.hub.arcgis.com/pages/feasibility
What does a DADU look like? Here are some of the recent listings in Ballard & Green Lake:
Sales in 2022 of DADU homes in the Green Lake & Ballard area average $760,000 for a 1036 square feet! Here is a list of the sales:
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