Salem, MA

Salem, MA Accessory Dwelling Unit (ADU) Rules

City Acceptance Rating: 6/10 (10 is most accepting)

Last updated: 10.10.2024

Image source: Norwell Social

What You Need To Know

Salem, like all of Massachusetts since the passage of the 2024 Affordable Homes Act, allows ADUs by right. Each town has slightly different rules surrounding ADUs, but they all must adhere to the framework outlined by the state. In Salem, one ADU per single-family home is allowed. Separately, owners who choose to rent their ADUs at or below 70% of the Fair Market Rent limit in Salem are eligible for a property tax exemption on their ADU.

Type of ADU Permit Required

ADUs in Salem do not require special permits, and can be built using a traditional building permit. For lots with two-five units, owners may apply for a special permit to build up to one ADU per unit. ADUs are not permitted on lots with over five units in Salem. 

ADU Rules

An ADU can be maximum 900 square feet or half the Gross Floor Area of the main house; whichever is smaller. 

  • The ADU and the main house must be owned by the same person(s).

  • Short-term rentals are prohibited.

  • No additional parking is required for an ADU. 

  • ADUs may be attached or detached from the main house - if detached, they must be built at least 10 feet from the main house.

  • ADUs cannot be built in the front yard.

  • Detached ADUs can have a maximum height of 18 feet

  • Attached ADUs must maintain the architectural style of the main house to the extent possible. 

  • ADUs must have a separate entrance from the main house - attached ADUs can share an entry hall with the main house, but need a separate entry within the entry hall. 

  • Exterior stairways need to be built on the side or rear of the ADU or main home.

  • Detached ADUs that are not owner occupied must have utilities on a separate service.

Resources:

https://library.municode.com/ma/salem/codes/zoning_ordinance?nodeId=S3.0USRE_3.2ACUS (See section 3.2.8)

Convert Existing Space, Attached ADU, Detached ADUChris LeeMassachusetts, Friendliness Score: 6/10, Salem, Greater Boston