Massachusetts Homeowners Can Now Add ADUs in 2025

If you’re a homeowner in Massachusetts, this could be the most critical housing update you hear all year. A major state law passed last August just made it significantly easier to expand or update your property. Whether you’re thinking about adding space for a family member or looking for ways to bring in extra income, this law opens up new options that didn’t exist before.

What is the Affordable Homes Act? The Affordable Homes Act is a $5 billion law passed by the Healey administration to address the housing shortage in Massachusetts. One of the biggest shifts it brings is around ADUs—also known as accessory dwelling units. These are secondary housing units on a single-family lot, and under the new law, they’re now allowed by right in many areas.

You can now add an Accessory Dwelling Unit (ADU) without special approval. If you live in a single-family zone, you can now build an ADU up to 900 square feet on your property without needing a special permit. This could be a small apartment over the garage, a finished space in the basement, or a detached unit in your backyard. As long as it meets basic state-building requirements, you have the green light to move forward. This gives you the flexibility to support your family, create rental income, or simply use your space more efficiently.

Homebuyers may soon get inspection rights by default. Another part of the law still in progress could guarantee home inspections as a right for buyers. That means you wouldn’t have to give up an inspection just to compete in a bidding war. Final details are expected by June 15, but early indications suggest buyers will gain more protection and peace of mind when purchasing a home.

Get guidance on what this means for you. Understanding how these new rules apply to your situation can feel overwhelming, but you don’t have to figure it out on your own. If you’re thinking about building an ADU, selling your home, or buying in this changing market, I’m here to help you make smart, informed decisions. Let’s talk through what these changes mean for you and how to move forward with confidence. You can reach me at (857) 210-9925 or email Lou@c21revolution.com to schedule a consultation.