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June 1, 2026
ADU Architect in Redmond, WA Design and Permits | Piper Cole Architects
Redmond, WA is one of the strongest markets for ADU development in the Seattle area — driven by tech-sector housing demand, large residential lots, and a permit process that is typically faster than Seattle. Piper Cole Architects has designed and permitted ADUs throughout Redmond.
ADU Types in Redmond
Detached ADU (DADU):
Freestanding backyard cottage — most common type for Redmond’s larger lots
Garage Conversion ADU:
Converting an existing detached garage — most cost-effective
Attached ADU:
Basement conversion or addition to primary home
Redmond ADU Permit Timeline
City of Redmond ADU permit review typically takes 4-8 weeks — significantly faster than Seattle’s 8-14 weeks. Redmond has implemented online permit submission which has further streamlined the process. Piper Cole Architects knows the Redmond Development Center staff and current code interpretations.
ADU Rental Market in Redmond (2026)
Redmond ADU rental rates benefit from proximity to Microsoft, Google, Meta, and other tech employers. 1-bedroom ADU rents: $1,900-$2,600/month. 2-bedroom ADU rents: $2,500-$3,400/month. Strong ROI fundamentals for ADU investment in Redmond.
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See our ADU service or contact us for a free feasibility consultation. Call 425-753-6452.
Authoritative sources
Regulatory requirements referenced in this guide are set by the official agencies below. Rules change — always confirm current requirements with the source:
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