Guides
HB 1110 Middle Housing on Seattle’s Eastside: A Licensed Architect’s Guide
HB 1110 middle housing on the Seattle Eastside: what the new density law means for your lot, from a licensed architect. Piper Cole Architects.
David Meade · June 24, 2026
Mixed-Use Building Design in Seattle: Residential Over Retail
Mixed-use building design in Seattle: residential over retail, zoning, and code essentials for developers. Piper Cole Architects.
David Meade · June 22, 2026
Triplex & Fourplex Design in Seattle Under HB 1110 (2026)
Triplex and fourplex design in Seattle under HB 1110 (2026): what the density law allows and how to design for it. Piper Cole Architects.
David Meade · June 22, 2026Why Civic Architecture Needs a Different Process
Why civic architecture needs a different process: public projects, stakeholders, and codes explained by Piper Cole Architects.
David Meade · June 22, 2026Duplex Design in Seattle (2026): What the New Zoning Allows
Seattle now allows duplexes on most residential lots. A guide to duplex design, HB 1110 zoning, construction costs, and maximizing your lot in 2026.
David Meade · June 1, 2026Commercial Renovation Permits in Seattle: What Businesses Need to Know
Change of occupancy, ADA path of travel (budget 20% of the renovation on older buildings) and tenant improvement permits in Seattle. Call 425 753 6452.
David Meade · May 30, 2026Restaurant Architecture in Seattle: Design, Permits, and What to Budget
Designing a restaurant in Seattle: kitchen layout, fire suppression, ADA, health department review, and realistic build-out costs for 2026.
David Meade · May 30, 2026
Can You Build an ADU on a Multifamily Lot in Seattle? (2026)
ADU rules for duplex and multifamily lots in Seattle following HB 1110. What the Missing Middle Housing legislation means for ADU development in 2026.
David Meade · May 30, 2026Commercial Tenant Improvement Architect in Seattle, WA
Office, retail, medical and restaurant TI costs in Seattle for 2026, permit timelines of 3 to 6 months, and typical TI allowances. Call 425 753 6452.
David Meade · May 27, 2026Residential vs. Commercial Architecture: What’s the Difference?
What sets residential and commercial architecture apart? A clear guide for Seattle-area property owners, homeowners, and developers.
David Meade · May 20, 2026
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