Seattle DADU Regulations Guide
Accessory dwelling unit regulations have gotten complicated with all the zoning changes, permit requirements, and design standards flying around. As someone who has navigated Seattle’s DADU rules extensively, I learned everything there is to know about building legal units. Today, I will share it all with you.
What DADUs Are
Probably should have led with this section, honestly—Detached Accessory Dwelling Units are separate living spaces on single-family lots.
Seattle Requirements
- Size limits based on lot size
- Height restrictions
- Setback requirements
- Owner occupancy rules (check current status)
Permit Process
- Pre-application meeting recommended
- Submit design for review
- Meet building code requirements
- Schedule inspections
Design Considerations
- Utility connections
- Parking requirements
- Privacy for neighbors
- Access and safety
