Northborough, MA

Northborough, MA Accessory Dwelling Unit (ADU) Rules

City Acceptance Rating: 7/10 (10 is most accepting)

Last updated: 8.14.2024

What You Need To Know

Currently not in compliance with the Massachusetts Affordable Homes Act.

ADUs are allowed with, attached, or within an existing detached structure like a barn or garage.

Type of ADU Permit Required

ADUs are permitted by right in Northborough.

ADU Rules

  • The owner of the property must occupy either the ADU or the primary dwelling except for bona fide absence of not more than six months.  

  • There cannot be more than one ADU per lot.

  • The ADU cannot be greater than 800 square feet of gross floor area.

  • The appearance of a single family home must be maintained, and exterior staircases must be enclosed within the structure.

  • One off-street parking space must be provided in addition to parking for the existing dwelling. 


Resources:

https://ecode360.com/41981040#41981073




Convert Existing Space, Attached ADU, Detached ADUChris LeeMassachusetts, Northborough, Greater Boston, Friendliness Score 7/10