ADU & DADU guides.
Real numbers, permitting know-how and honest advice on building backyard homes across Seattle, King and Snohomish County — written by the crew that builds them.
Do You Need a Permit to Build a DADU in Seattle?
The permits you need to build a backyard DADU in Seattle, the zoning rules that decide whether you can build at all, and how long it really takes.
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ADU vs DADU: What’s the Difference?
An ADU is any second dwelling on your lot; a DADU is the detached, standalone version. Here’s how the two compare on cost, privacy, construction and permitting.
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How Much Does It Cost to Build a DADU in Seattle?
Real 2026 price ranges for a backyard DADU in the Greater Seattle area — and the three cost categories that decide your final number.
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Tell us about your lot and your goals. Eric follows up personally — the same person from the first call through final inspection. No pressure, no obligation.
- Owner-led — 35+ years, 100+ homes built
- Clear, line-item pricing · no hidden fees
- Serving Seattle, King & Snohomish County