Accessory Dwelling Units – Information
What is the law?
On August 6, 2024, Governor Healey signed the Affordable Homes Act into law (Chapter 150 of the Acts of 2024). Section 8 of the Affordable Homes Act amends the Zoning Act to allow ADUs up to 900 square feet to be built by right in single-family zoning districts. The historic legislation authorized $5.16 billion in spending over five years along with nearly 50 policy initiatives to counter rising housing costs. The new law on ADUs is an example of a small policy change that will make a big difference. Massachusetts is a leader in finding innovative solutions to our biggest challenges. Rising housing costs and homelessness are not unique challenges for our state, but we can lead the way in solving them.
An ADU must:
- Maintain a separate entrance, either directly from the outside or through an entry hall or corridor shared with the principal dwelling sufficient to meet the requirements of the state building code for safe egress,
- Be either no larger than half the gross floor area of the principal dwelling or 900 square feet, whichever is smaller,
- Meet municipal restrictions, including, but not limited to, additional size restrictions and restrictions or prohibitions on short-term rental.
Webinar: Accessory Dwelling Units⇒
