An Act relative to accessory dwelling units on smaller lots

This bill restricts accessory dwelling units (ADUs, or secondary homes) in single-family zoning districts with lots 10,000 square feet or smaller. It requires ADUs to be owner-occupied and limited to extended family members living there. Municipalities can override these rules by voting locally to waive the owner-occupancy and family requirements. The law directly affects homeowners in qualifying single-family neighborhoods seeking to add ADUs on smaller properties.