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H 4707

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

194th Legislature (2025-2026) Introduced by Shirley Arriaga and 11 co-sponsors

Massachusetts bill legalizes movable tiny houses as permanent residences and accessory units to expand affordable housing supply and address the state's severe housing shortage.

Bill reported favorably by committee and referred to the committee on House Ways and Means
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Bill Summary · H 4707

Legislative bill overview

H 4707 permits movable tiny houses to be used as permanent residential dwellings and accessory dwelling units (ADUs) in Massachusetts, removing restrictions that previously classified them as temporary or mobile structures. The bill modifies zoning and building code definitions to treat qualifying tiny houses as permanent housing options comparable to traditional fixed structures.

Why is this important

Massachusetts faces a significant housing affordability and supply crisis, with median home prices far exceeding state income levels. Legalizing movable tiny houses as permanent dwellings could increase housing supply, reduce construction costs, and provide more affordable ownership options while helping communities address workforce housing shortages without extensive land development.

Potential points of contention

  • Property tax and valuation concerns: Local assessors may struggle with valuation methodology for movable structures, potentially creating inequities or tax revenue unpredictability for municipalities
  • Neighborhood character and zoning impacts: Homeowners in established neighborhoods may resist tiny house development as ADUs, fearing impacts on property values and community aesthetic despite density benefits
  • Infrastructure and utility standards: Questions remain about water, sewer, electrical, and waste management standards for movable units, especially in older communities with aging infrastructure
  • Permanent vs. movable classification: Defining what makes a tiny house "movable" versus permanent could create loopholes or inconsistent enforcement across different jurisdictions

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

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