5 Things to Know about ADUs
MA just changed the rules. Here’s what that means for homeowners.
Accessory Dwelling Units (ADUs) just got the green light across Massachusetts — and the impact on local housing markets like Bedford, Lexington, Burlington, and Concord could be massive. Whether you’re a homeowner, investor, or real estate professional, here are five surprising facts you probably didn’t know about the new ADU laws and what they mean for your community.
1. You Can Build an ADU Without a Special Permit
As of February 2025, Massachusetts homeowners in single-family zones can build an ADU up to 900 square feet or half of the gross floor area of the primary dwelling by right — no special permit, no long zoning board process. So, for a 2,000 square foot house, that’s 900 extra feet of space; for a 1,200 square foot house - you could have a 600 square ft ADU.
Each town has its own bylaws, especially for properties that are non-confirming, but typically that means fewer hurdles and faster timelines for adding a rental unit, in-law suite, or flex space to your property.
🛠️ Think: basement conversion, detached backyard cottage, or even a garage loft.
2. You Don’t Even Need to Live There
One of the biggest changes? Owner-occupancy is no longer required. That’s right — you can rent out both the primary home and the ADU. This opens the door to more flexible ownership models, especially for investors or multi-generational families.
3. Lot Size No Longer Limits You
Towns can’t impose minimum lot size requirements for ADUs anymore. Previously, many local bylaws (like in Concord or Lexington) blocked homeowners with smaller lots from even applying. Now, the state law overrides that — leveling the playing field across neighborhoods.
4. Prime Rental Demand Near Hanscom AFB, Tech Corridors, and Rt. 128
With defense contractors, tech firms, and Hanscom Air Force Base nearby, ADUs offer a new way to tap into steady rental demand — perfect for traveling professionals, extended family, or long-term tenants.
5. ADUs Could Boost Your Home’s Value — But Also Shift the Neighborhood Vibe
ADUs can increase property value, generate rental income, and create space for aging parents or adult children. But they also raise concerns: parking, traffic, and potential changes to neighborhood character.
🤝 It’s a balancing act — and local planning boards are already working to get it right.
The Bottom Line
While there are many things to consider as we work to incorporate ADUs more thoughtfully into our towns. But, it's a necessary shift— and one that opens up creative housing solutions in some of the state’s most in-demand towns. For agents and homeowners around Bedford, it’s time to get smart about ADUs. The opportunity is real — and coming fast. To keep tabs on ADU opportunities, rules, and regulations, check with your local town or municipality.
