In Washington State, an architect is legally required for structural modifications, additions over certain thresholds, and commercial projects. Guide by David Meade AIA NCARB, Piper Cole Architects.

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ADU costs on the Seattle Eastside in 2026 range from $80K for a garage conversion to $650K+ for a premium DADU. Permit fees, ROI analysis, and city-by-city cost comparison by David Meade AIA NCARB.

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