DEPARTMENT OF HOUSING AND COMMUNITY AFFAIRS
Division of Finance and Administration
1401 Rockville Pike, 4th Floor • Rockville, Maryland 20852 • 240-777-0311 • 240-777-3699 FAX • www.montgomerycountymd.gov/dhca
Asse
Management Grants Administration Managemen
Services
Licensing and Registration
montgomerycountymd.gov/311 240-773-3556 TTY
Isiah Leggett
County Executive
Clarence J. Snuggs
Director
CLASS 3 ACCESSORY APARTMENT
FACT SHEET
Owners of Single Family detached homes in Montgomery County* may be permitted to create
and rent a Class 3 Accessory Apartment in their home if they follow a few basic procedures. A Class 3
Accessory Apartment is a second dwelling that is part of (but subordinate to or on the same lot as) an
existing one-family detached home and has its own provisions for cooking, eating, sanitation and
sleeping. A license is issued by the Department of Housing and Community Affairs for an accessory
apartment that does not require a special exception. Accessory Apartment units must be in compliance
with requirements of Montgomery County Code: Chapter 59-Zoning Ordinance, Chapter 26-Housing
Standards, Chapter 29-Landlord/Tenant Relations, and all applicable laws.
Accessory Apartment Requirements
Before offering an Accessory Apartment for rent, an owner must first obtain a rental license from
Montgomery County Department of Housing and Community Affairs. An owner, who operates a rental
facility without first obtaining a license, may be subject to a $500 civil citation. Properties with well
and/or septic must contact Department of Permitting Services (DPS) at 240-777-0311 to make sure it
meets required code for total individuals living at your accessory apartment dwelling unit property. A
photocopy of the document you receive from DPS must accompany your application.
The Existing Single-Family Dwelling Must:
Be a Single Family Detached Home – no townhouses, duplexes or mobile homes.
Be owner occupied.
Be at least 5 years old as of the date of the application.
Be [attached] located in the RE-2, RE-2C, RE-1, R-200, RC, RMH-200, and R-150
zones is located at least 500 feet from any other approved or pending accessory apartment,
measured in a line from side lot line to side lot line along the same block face.
Be [attached] located in the R-90
(including Plan Development zones), R-60, RNC, PD2,
PD3, and PD2-2 zones is located at least 300 feet from any other approved or pending accessory
apartment, measured in a line from side lot line to side lot line along the same block face.
Be [detached] located in the RE-2, RE-2C, and RE-1 zones is located a minimum distance of 500
feet from any other approved or pending accessory apartment, measured in a line from side lot
line to side lot line along the same block face.
Zone R-40 accessory apartment is not allowed for licensing nor conditional use.
Have on-site parking provided in addition to any required on-site parking for the principle
dwelling. See Class 3 Accessory Check List for specifics on required square footage of
driveway.
Complete separation of units is required (from main house to accessory apartment). Have
a separate entrance located so that the appearance of a one-family home is preserved.