Garage conversion rules in Marysville, WA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Garage conversions to habitable space or ADUs require a building permit under WAC 51-50 and MMC. HB 1337 (2023) facilitates conversions to ADUs, allowing conversions even from existing structures that violate current setback or lot coverage rules. Contact the permit office for guidance.
Converting an attached or detached garage to living space in Marysville's city limits requires a building permit and must meet habitable room standards. Conversions must include proper egress windows, insulation to current energy code, minimum ceiling height (7 feet 6 inches), electrical upgrades, and HVAC. If the garage provided required off-street parking, the property owner may need to demonstrate alternative parking (driveway, carport) or obtain a parking variance. Garage conversions to ADUs have additional requirements including kitchen, bathroom, and separate entrance. The conversion must comply with the property's zoning district setback and lot coverage limits.
Unpermitted garage conversions face fines of $500–$2,000, mandatory permit acquisition (double fees), and may need to be restored to garage use if code requirements cannot be met.
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Side-by-side rule comparisons with other cities in Snohomish County.
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