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ADU rules for duplex, triplex, and multifamily lots in Seattle in 2026 following Washington State HB 1110 and the Missing Middle Housing legislation.

What is the difference between interior design and interior architecture? When Seattle homeowners need each, and when you need both. By Piper Cole Architects.

How the architectural process differs for new construction vs. renovation projects in Seattle. Scope, timeline, fees, and what each type of project requires.

Home office design ideas for Seattle homeowners in 2026. Additions, garage conversions, ADU studios, basement conversions, and what each option costs.

Comparing second story additions and ground floor additions for Seattle homeowners. Cost, disruption, zoning, and design considerations for each option.

Real rental income numbers for ADUs in Seattle, Kirkland, Bellevue, and the Eastside in 2026. ROI analysis and break-even timeline for backyard cottages and garage conversions.

Comparing Passive House and net zero energy standards for Seattle homeowners. Performance, cost, certification, and which approach makes most sense in the Pacific Northwest.

Complete guide to Seattle DADU (Detached Accessory Dwelling Unit) rules in 2026. Size limits, setbacks, height, owner occupancy, permits, and what has changed.

Realistic timeline for a home addition in Seattle from design through move-in. Design, permit, and construction phases with real 2026 numbers from Piper Cole Architects.

Comparing architect fee structures for Seattle-area projects. When percentage works, when fixed fee is better, and how to negotiate. By Piper Cole Architects.