Concord, MA

Concord, MA Accessory Dwelling Unit (ADU) Rules

City Acceptance Rating:
7/10

Type of permit:

Up to 750 sq. ft. ADU is by right. Anything between 750 - 1,000 (max) sq. ft. will require a special permit from the Zoning Board of Appeals.

ADU rules in Concord:

1. Only 1 accessory dwelling unit per lot

2. The additional dwelling unit can have up to 750 square feet of gross floor area of the single-family dwelling or detached accessory structure

3. Must meet minimum lot size for the applicable Zoning District

4. Either the additional dwelling unit or the single-family dwelling must be occupied by the owner of the property

5. Dimensioned floor plans of the additional dwelling unit must be filed with the building permit or special permit application

6. One parking space must be provided for the additional dwelling unit

7. The property must be served by Town sewer or, alternatively, the on-site subsurface disposal system must be adequate to accommodate any increased flows generated by the additional dwelling unit

8. The accessory dwelling unit cannot be legally separated or sold apart from the single-family dwelling

9. The accessory dwelling unit must meet the height restrictions for primary and accessory structures in the applicable Zoning District as required in Section 6.2.11

10. The total gross floor area of all buildings on the lot must conform to the maximum floor area ratio as required in Section 6.2.13, and;

11. The single-family dwelling or the additional dwelling may not be used for a bed and breakfast

See the full text here: Zoning Bylaws for Concord, MA

Proposed Changes Article 32 Accessory Dwelling Unit