Tiny Homes: Lexington vs Lowell
How do tiny homes rules compare between Lexington, MA and Lowell, MA?
Lexington and Lowell have similar restriction levels.
Lexington, MA
Middlesex County
Middlesex County has no tiny-home ordinance because the county government was abolished in 1997. Massachusetts adopted Appendix Q (tiny houses on permanent foundations, 400 sq ft or less) into 780 CMR effective January 1, 2020. Whether a tiny home is allowed in a specific Middlesex town depends entirely on that town's local zoning bylaw, which controls minimum dwelling size, lot area, and accessory-dwelling-unit standards.
View full Lexington rules →Lowell, MA
Middlesex County
Tiny homes on permanent foundations can qualify as ADUs in Lowell under the 2024 state ADU mandate up to 900 square feet. Tiny houses on wheels are generally not allowed as permanent dwellings because they are classified as RVs under state law.
View full Lowell rules →Key Facts Comparison
| Fact | Lexington | Lowell |
|---|---|---|
| County Government | Abolished 1997 | - |
| Appendix Q Effective | January 1, 2020 | - |
| Appendix Q Size Limit | 400 sq ft or less | - |
| On Wheels | Not covered by Appendix Q | - |
| ADU by Right | Up to 900 sq ft (Ch. 150/2024) | - |
| On foundation | - | Allowed as ADU |
| Size cap | - | 900 sq ft for ADU |
| Code | - | 780 CMR Appendix AQ |
| On wheels | - | Treated as RV not home |
| Permit | - | Inspectional Services |
Highlighted rows indicate differences between cities.
Lexington FAQ
Can I build a tiny house in Middlesex County, Massachusetts?
There is no county-level tiny home rule because Middlesex County government was abolished in 1997. Massachusetts adopted Appendix Q of the state building code (780 CMR) effective January 1, 2020, which covers permanent-foundation tiny houses 400 sq ft or less. Whether you can build one depends on the local zoning bylaw of your specific town (Cambridge, Lowell, Newton, etc.); check with that town's planning department.
Are tiny homes on wheels legal in Middlesex County towns?
Generally no. Massachusetts Appendix Q only covers tiny houses on permanent foundations. Tiny houses on wheels are treated as recreational vehicles, and most Middlesex County towns do not allow RVs as a primary dwelling under their zoning bylaws. The 2024 Affordable Homes Act allows ADUs up to 900 sq ft by right in single-family zones, which gives more flexibility for accessory tiny dwellings on a foundation.
Lowell FAQ
Can I live in a tiny home in Lowell?
Yes if it is on a permanent foundation and built to code, typically qualifying as an ADU up to 900 square feet.
Can I park my tiny house on wheels and live in it?
No. Massachusetts classifies tiny houses on wheels as RVs, which cannot be used as permanent residences in residential zones.
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