Detailed Description of Work – Accessory Dwelling Unit Project Address: 5918 – 99th Place NE, Marysville, WA 98270 Project Type: New detached Accessory Dwelling Unit (ADU) construction Scope of Work: Construct a two-story wood-framed ADU totaling approximately 1,464 square feet (695 SF main floor + 769 SF upper floor). Layout includes living room, kitchen, bathroom, bedrooms, and storage areas per submitted plans. Foundation: reinforced concrete slab with continuous footings, vapor barrier, and perimeter drainage per structural notes. Framing: 2×6 exterior walls at 16" O.C., raised-heel roof trusses, engineered floor joists, and shear walls per schedule. Roof: metal roofing (owner’s selection) over sheathing, with gutters and downspouts tied to approved storm drainage. Exterior: board-and-batten siding, trim, and bolt-on metal railings per manufacturer specifications. Interior: insulation per 2021 WA Energy Code (R-60 roof, R-30 floor, R-20+5 walls), drywall, finishes, cabinetry, and fixtures. Mechan
Submitted Dec 18, 2025Issued Mar 30, 2026
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