Southborough ADU Bylaw Analysis
1 AG DISAPPROVALProvision-by-provision analysis of Southborough's ADU bylaw against Massachusetts Chapter 150 and 760 CMR 71.00. 1 inconsistent provision identified.
Southborough Bylaw Consistency
Southborough Zoning Bylaw, ADU provisions (AG Decision, February 17, 2026) · Last updated 2025 (AG partial disapproval February 2026)
Last reviewed: February 17, 2026
What This Means
Southborough tried to ban mobile homes from being used as ADUs, but the AG struck down the restriction because the town’s broad definition of “mobile home” included manufactured homes protected under state law. The travel trailer ban was upheld. The Planning Board is already working on revisions for April Town Meeting. This decision sets a precedent: towns cannot use overbroad definitions to exclude modular or manufactured ADUs. (My Southborough, February 2026)
Permit Activity
0 of 2 approved (0%)Share of 2025 applications approved in 2025
Data Provenance
Reviewed: February 17, 2026
AG action: February 17, 2026 source
Bylaw source: Zoning Bylaw · retrieved February 19, 2026
Version date not published; analysis based on publicly available text retrieved February 19, 2026
Building & Safety
Bottom Line
Southborough has 1 provision that appears inconsistent with G.L. c. 40A §3 and is subject to statutory override under Chapter 150. 1 has been formally disapproved by the Attorney General.
Methodology
This analysis compares each town's published ADU zoning bylaw or ordinance against Massachusetts Chapter 150 (2024), MGL c.40A §3, and 760 CMR 71.00. Per EOHLC guidance, towns are not “inconsistent” simply because their local zoning has not been updated — however, any local provisions inconsistent with the ADU statute are preempted by state law as of February 2, 2025. Local permitting decisions should not take into account zoning rules that conflict with state law. Attorney General disapproval data sourced from published AG Municipal Law Unit decisions. This is not legal advice — consult a zoning attorney for project-specific guidance.
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