Arlington, MA

Arlington, MA Accessory Dwelling Unit (ADU) Rules

City Acceptance Rating: 8/10

Last updated: 6.2.2024

Image source: Visit Lexington

What You Need To Know

Arlington, to promote aging in place, creation of independent living spaces, grow property values, and promote housing for those of all income levels, has created rules to allow ADUs in any residential or business district.  ADUs can be built on single family, two family, or duplex dwellings..  

Type of ADU Permit Required

Through a building permit, ADUs are allowed in all residential and business districts.

ADU Rules in Arlington

  • ADUs cannot be greater than ½ in floor area than the floor area of the primary residence or 900 square feet, whichever is smaller.

  • ADUs must have a separate entrance that is either from directly outside or from a shared entry hall or corridor with the primary residence.

  • There is only one ADU allowed per principal residence.

  • ADUS can be located in a primary residence, attached to a primary residence, or as an accessory building.

  • ADUs cannot be used as short term rentals.

  • No off-street parking is required.

  • The ADU cannot be owned separately.

  • The addition of an ADU does not reclassify the zoning of the property.

  • Prior to a building permit being issued, the owner must notify the building inspector that the owner or a family member will reside in either the primary dwelling or the ADU.  

Resources:

https://www.arlingtonma.gov/home/showpublisheddocument/43413/638500759460700000 

Convert Existing Space, Attached ADU, Detached ADUChris LeeGreater Boston, Arlington, Massachusetts, Friendliness Score 8/10