Now covered in more depth
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 5 to 8 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.
Planning a project?
Wondering what an ADU on your lot would cost?
Send David the address and a few lines about what you want. The first feasibility check is free and usually takes about a day: what the site and the code are likely to allow, and what to check first.
Architect since 1996, member of the AIA and NCARB. Three Masonry Excellence Awards for commercial projects; the Carr residence was featured in Above The Lake and Lux magazines.
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.
Free ADU Consultation
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:
