This bill amends Chapter 40A of the General Laws to allow movable tiny houses to be used as permanent residential dwellings and accessory dwelling units. It introduces a definition for "movable tiny house," describing it as a transportable dwelling unit not exceeding 400 square feet, intended for residential use on individual house lots or as accessory units. The bill also mandates the Massachusetts Department of Transportation and the registry of motor vehicles to create a new category for movable tiny houses, allowing cities and towns to opt-in to issue and manage certificates of title for these structures, with a registration fee set at $100.

Additionally, the bill outlines specific requirements for movable tiny houses, including the need to be permanently affixed to an approved chassis and built in compliance with state building codes, while allowing for certain insulation standards. It stipulates that a movable tiny house can be occupied for up to 180 days before requiring an established address and inspection, after which a certificate of occupancy must be obtained if it meets inspection standards. The bill also permits cities and towns to adopt less restrictive regulations and incentivize hosted parking for movable tiny houses through tax abatements or other incentives.