An Act relative to accessory dwelling units

This bill amends Massachusetts zoning laws to allow accessory dwelling units, also known as in-law suites, in single-family residential areas on lots of at least 5,000 square feet. The legislation defines these units as self-contained living spaces with separate entrances that cannot be sold separately from the main home and must be at least 450 square feet but no larger than half the size of the primary dwelling or 900 square feet. A key provision requires that at least one person in either the main house or the new unit must be elderly or have a disability, while still permitting municipalities to limit the total number of such units to a minimum of 5 percent of existing housing. Additionally, the bill sets specific rules for parking, requiring no more than one additional space, and allows local governments to regulate setbacks and building height.