Development and Planning, Housing and Community Services

New Attached Accessory Dwelling Unit Law to Go Into Effect in April

Public Information Office

November 27, 2023
12:08 pm

Legislation allowing the conditional use of attached accessory units in the City of Rockville will go into effect Tuesday, April 9 following passage of a zoning text amendment by the Mayor and Council in October.

Attached accessory dwelling units, or attached ADUs, are secondary dwellings either inside or attached to single-family homes. Examples of these include an apartment over a garage or a smaller structure (on a foundation) in the backyard.

A property owner who wants to construct an attached ADU must meet requirements for owner-occupancy, square footage, parking and other conditions.

When the new regulations become law in April, those who wish to either build an attached ADU under the new zoning rules or bring an existing unpermitted attached ADU into compliance can begin the application process. Attached ADUs were previously only permitted as special exceptions.

For more information about accessory buildings and dwellings, visit www.rockvillemd.gov/2345/Accessory-Buildings-and-Dwellings.

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