Massachusetts has recently enacted legislation that simplifies the process for homeowners to add Accessory Dwelling Units (ADUs) to their properties. This development opens up new opportunities for creating additional living spaces, whether for family members, rental income, or personal use.
Overview of the Massachusetts ADU Law
In August 2024, Governor Maura Healey signed the Affordable Homes Act into law, permitting the construction of ADUs by right in single-family zoning districts across the state. This means that homeowners can now build ADUs without the need for special permits, provided they adhere to specific guidelines:The Arc of Massachusetts+3AARP States+3Mass.gov+3
- Size Restrictions: ADUs must be no larger than 900 square feet or half the size of the principal dwelling, whichever is smaller.
- Entrance Requirements: ADUs must have a separate entrance, either directly from the outside or through a shared entry hall.
- Parking Regulations: Municipalities cannot require more than one parking space for an ADU located outside 0.5 miles from a commuter rail station, subway station, ferry terminal, or bus station.
For a comprehensive overview of the law, visit the Massachusetts Government’s ADU Information Page.
What This Means for Homeowners
The new law streamlines the process of adding an ADU to your property, offering several benefits:
- Simplified Permitting: Building an ADU is now more straightforward, reducing bureaucratic hurdles.
- Increased Property Value: An ADU can enhance your property’s value and provide potential rental income.
- Flexible Living Arrangements: ADUs offer versatile solutions for housing family members or tenants.
City-by-City ADU Regulations in Massachusetts
Want to know what’s allowed in your town or city? Use our interactive database to check local zoning, permitting requirements, and ADU restrictions across Massachusetts.