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HD 3066

An Act allowing movable tiny houses as permanent residential dwellings and accessory dwelling units

194th Legislature (2025-2026) Introduced by Mike Brady and 5 co-sponsors

Massachusetts bill permits movable tiny houses as permanent homes and ADUs to expand affordable housing supply and address shortage through lower-cost construction option.

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Bill Summary · HD 3066

Legislative bill overview

HD 3066 would amend Massachusetts zoning and building codes to permit movable tiny houses (houses built on chassis with axles) to be used as permanent residential dwellings and accessory dwelling units (ADUs). Currently, Massachusetts building codes treat such structures as recreational vehicles, not permanent housing, effectively prohibiting their residential use despite their structural capacity.

Why is this important

This addresses Massachusetts' severe housing shortage and affordability crisis by enabling a lower-cost housing option that could be deployed relatively quickly. Tiny houses on wheels typically cost 30-50% less than traditional construction, potentially increasing housing supply in communities with restrictive zoning while reducing reliance on resource-intensive conventional development.

Potential points of contention

  • Tax base and municipal revenue concerns: Property tax valuation of movable homes may be ambiguous, and communities could lose projected tax revenue if tiny houses generate lower assessments than traditional single-family homes
  • Infrastructure and servicing standards: Questions about permanent utility connections (water, sewer, electrical), foundation requirements, and whether movable housing adequately integrates with municipal services and planning
  • Precedent and equity: Risk that permitting movable housing in some areas while maintaining restrictions elsewhere could create two-tier housing markets; concerns about whether this becomes a workaround for affordable housing rather than genuine affordable housing policy
  • Resale value and consumer protection: Long-term property value stability, financing accessibility, and whether residents could refinance or resell movable homes comparable to traditional housing

Compiled from official sources — confirm details with the bill’s official record.

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