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Realistic home addition costs in Kirkland, WA for 2026. Second stories, primary suites, kitchen additions, and ADUs — cost ranges and what drives them.

Architecture services on Mercer Island, WA. Luxury waterfront homes, estate renovation, ADUs, and custom residential design. 25+ years Seattle experience. Free consultation.

Architecture services in Medina, WA. Luxury lakefront homes, estate renovation, and new construction in one of the Pacific Northwest’s most prestigious communities. Free consultation.

Custom home architect in Bellevue, WA. Luxury residential design across Bellevue’s neighborhoods — Somerset, West Bellevue, Bridle Trails, Enatai, and Medina. Free consultation.

ADU design and permits in Redmond, WA. Backyard cottages, garage conversions, and attached ADUs under City of Redmond codes. Free consultation. Call 425-753-6452.

Architecture services in Issaquah, WA. Home additions, ADU design, and custom homes in Issaquah Highlands and surrounding neighborhoods. Free consultation.

Architecture services in Sammamish, WA. Custom homes, second story additions, ADUs, and renovation on the Sammamish Plateau. Free consultation. Call 425-753-6452.

Architecture services in Woodinville, WA. Estate homes, rural residential, winery buildings, and home additions in the Woodinville wine country. Free consultation.

Estimate the cost of your home addition in Seattle for 2026. Cost per square foot by addition type, neighborhood premium factors, and what drives prices up or down.

ROI analysis of home improvements in Seattle for 2026. ADUs, kitchen remodels, bathroom additions, second stories — which add the most value at sale.