Tiny Homes in Lowell, Massachusetts

Lowell fully implements the statewide Affordable Homes Act (Chapter 150, Acts of 2024). ADUs up to 900 sq ft are allowed by-right in every zoning district that permits single-family homes — internal conversions, attached additions, and detached structures (including converted garages and carriage houses) all qualify. The size cap is 900 sq ft or 50% of the primary dwelling, whichever is less, with a 350 sq ft minimum per state health code. Lowell does not layer owner-occupancy requirements, excessive parking mandates, or special-permit triggers on top of the state rule, making it one of the more straightforward MA cities for ADU approval. A building permit, plumbing permit, electrical permit, and Certificate of Occupancy are required from the Lowell Division of Development Services. Tiny homes of 400 sq ft or less on permanent foundations can use the Appendix AQ pathway from the 10th Edition of 780 CMR. THOWs are classified as recreational vehicles and cannot serve as primary residences on standard residential lots. Verify current requirements with your local planning department before purchasing land or beginning construction.