Tiny home rules in Holbrook, MA — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
MA adopted IRC Appendix Q (tiny homes under 400 sq ft) into 780 CMR 9th Edition. Tiny homes on foundations must meet building code. Tiny Homes on Wheels (THOW) classified as RVs — mostly prohibited as permanent dwellings.
Massachusetts Building Code (780 CMR 9th Edition) incorporated IRC Appendix Q establishing standards for tiny houses under 400 sq ft (compact stair/ladder allowances, reduced loft headroom, etc.). Tiny homes on permanent foundations in Norfolk County are treated as single-family dwellings — full building permit, minimum square footage set by each town's zoning (Brookline §4.02 minimum varies by district, Quincy generally 650+ sq ft, Weymouth §120-8 varies). MA Affordable Homes Act (2024) mandates single-family homeowners may add one ADU by right — this is a major pathway for tiny-home-as-ADU in Norfolk County. THOWs are considered RVs/campers under 780 CMR, not permitted as permanent residences in residential zones of Quincy, Brookline, or Weymouth. Some rural Norfolk towns (Medfield, Dover, Sherborn) may allow limited camping use. Utility connections (water, sewer, electrical) require standard permits.
THOW used as permanent dwelling: zoning violation, $300/day under local bylaw. Unpermitted foundation tiny home: stop-work, CO withheld. MGL c. 40A §3 preempts local ADU bans — tiny-home ADUs now protected.
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