/ guides from the job site
what it really costs, and what the city really allows
Typical Seattle ranges, our own finished projects with real numbers, rules from the current city code. No fluff, just the questions homeowners ask us before they call.
ADU & DADU8 min
ADU or DADU? How to Choose on a Seattle Lot
Attached unit or backyard cottage: the difference under Seattle's 2026 rules, what each costs and rents for, how long each takes, and the four questions that settle it for most lots.
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Permits & Costs9 min
What an ADU Costs in Seattle in 2026
Seattle ADU prices explained by a local contractor: basement and garage conversions, attached units and backyard cottages, what the per-square-foot rate covers, and seven finished projects with the real numbers.
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