Garage conversion rules in Weymouth, MA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Garage conversions to ADUs in Weymouth are permitted under the 2025 ADU ordinance (Article 29). Conversions require a building permit, Site Plan Approval, and design review. The converted ADU must comply with the 750–900 sq ft size limit and setback requirements.
Under Weymouth's ADU ordinance (Chapter 120, Article 29), converting a garage into an ADU is permitted by right. The converted unit must comply with ADU size limits (750 sq ft for lots under 25,000 sq ft; 900 sq ft for larger lots), setback requirements, height limits (not exceeding the principal structure), and must be in line with or behind the primary structure. A building permit, design review, and Site Plan Approval are required. The unit must match the style and design of the primary structure.
Unpermitted conversions subject to stop-work orders and zoning enforcement.
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