Accessory Dwelling Units
LET LATITUDE ARCHITECTURE BE YOUR ADU DESIGNER IN MASSACHUSETTS
NEW LAW:
Have you heard about the new Massachusetts law that went into effect on February 2, 2025 regarding Accessory Dwelling Units, often referred to as “ADUs” or “in-law apartments". The new law permits ADUs by-right in single-family zoning districts statewide. This change stems from the Affordable Homes Act, signed into law by Governor Maura Healey on August 6, 2024.
KEY PROVISIONS OF THE ADU LAW:
-
By-Right Approval: Homeowners can now build an ADU without obtaining special permits or variances, simplifying the approval process.
-
Size Limitations: An ADU must be no larger than 900 square feet or half the gross floor area of the primary residence, whichever is smaller.
-
Separate Entrance: Each ADU must have its own entrance, either directly from the outside or through a shared entry hall, in compliance with state building codes.
-
Local Regulations: Municipalities may impose reasonable restrictions, such as site plan reviews, dimensional setbacks, and rules regarding short-term rentals. However, they cannot enforce owner-occupancy requirements or unreasonably restrict the creation or rental of ADUs.
COMMON REASON HOMEOWNERS CHOOSE ADUs:
-
Age in place.
-
Downsize from existing home.
-
Provide housing and/or space for family or friends to visit.
-
Young adult or recent college graduate.
-
Generate extra income with rental unit.
MORE INFORMATION VISIT
ADUs Classification:



INTERNAL
-
Unit that is inside the main building; small addition.
-
Entry is typically located off a shared entry hall.
SMALLER LOTS - NO DRIVEWAY
-
Split your unit.
-
Convert attic.
-
Convert basement.
-
Add new floor.
-
Addition towards rear yard.

ATTACHED
-
Building that is adjacent to main structure.
-
Typically with its own entrance.
MEDIUM LOTS -
-
Adapt your garage.
-
Addition towards rear yard.
-
Attach ADU on side.
-
Attached ADU on corner lot.

DETACHED
-
Building that is on its own.
-
Has its own entrance.
- Converted detached Garage.
LARGER LOTS
-
Attached ADU in front yard.
-
Build small addition in backyard.
-
Build large addition in backyard.

