Additional Dwelling Units (ADU's)

---

TO CALCULATE AN ACCESSORY DWELLING UNIT'S (ADU) AREA, MEASURE THE TOTAL INTERNAL SQUARE FOOTAGE OF THE LIVING SPACE, FROM THE INSIDE OF THE EXTERIOR WALLS, ENSURING IT COMPLIES WITH YOUR LOCAL ZONING LAWS AND THE MASSACHUSETTS LIMIT OF 900 SQUARE FEET OR 50% OF THE PRIMARY DWELLING, WHICHEVER IS SMALLER. EXCLUDE NON-LIVABLE AREAS LIKE STAIRWELLS, GARAGES, AND SPACES WITH LESS THAN 7 FEET OF CEILING HEIGHT. 

STEPS TO CALCULATE YOUR ADU AREA

• DETERMINE THE GROSS FLOOR AREA: 
• ADJUST FOR CEILING      HEIGHT: 
• EXCLUDE NON-LIVABLE      SPACES: 
• COMPARE TO LOCAL & STATE REGULATIONS: 
• MAXIMUM SIZE: 
• OWNER OCCUPANCY: 
• ZONING: 
• LOCAL BYLAWS: 
• PROFESSIONAL GUIDANCE: 

Coming Soon - Construction in 2026

Proposed one bedroom free standing ADU to be located behind the existing dwelling with 822 SF which is less than the existing structure which is 1,782 SF.