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
t
Management Grants Administration Managemen
t
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.
The Accessory Apartment Must:
Be less than 50 percent of the total net gross floor area in the principal dwelling; or 1200 square
feet, whichever is less. The maximum net gross floor area for an addition is 800 square feet.
Be internal to the existing home (unless the lot is larger than 1 acre and is in the required zone).
Have the same address as the main house.
Be the only additional living unit or residential use on a lot or parcel. No other tenants or
registered living unit permitted.
Be in compliance with all applicable laws.
LICENSING PROCESS FOR CREATING A CLASS 3 ACCESSORY APARTMENT
To create a Class 3 Accessory Apartment to be offered for rent, an owner-occupant must:
1. Apply for the license through Montgomery County Department of Housing and Community
Affairs, Licensing and Registration Unit, 1401 Rockville Pike, 4
th
Floor, Rockville,
Maryland 20852, 240-777-0311.
2. Once the Licensing Office has received your application, Licensing will review for
completeness within 5 days of receipt.
3. Department will send written notification of the application acceptance or will return the
application and all fees with a written explanation regarding missing documents.
4. OZAH Hearing Examiner will receive a copy of the application with documents of
acceptance of the application.
5. Department will post the information on the website and map of accessory apartment.
6. Owner must post the public notice sign on yard within 5 days of acceptance of the
application by the Department and remain posted for 30 days after the issuance of the
Director’s findings.
7. Licensing will review the application for compliance with zoning ordinances and the
Housing Code Enforcement will inspect for compliance with housing code and zoning
standards.
8. The Director will issue a report on the findings of the Licensing review and Housing Code
inspection.
9. A license will be issued or denied 30 days after the issuance of the Directors report.
10. Sign must be returned within 15 days after the end of the posting period.
11. Contact your homeowners’ association or see your association’s covenants for their rules
and regulations regarding an accessory apartment.
12. Changes in information provided on the original Accessory Apartment application must be
reported to the Department of Housing and Community Affairs, Licensing/Registration
Unit immediately.
13. If your property denied after the inspection for a Class 3 Accessory Apartment, you can
object with The Office of Zoning and Administrative Hearings by calling 240-777-6660 or
100 Maryland Avenue, Room 200, Rockville, MD 20850. If you know before applying for
the Class 3 Accessory Apartment that your parking and/or zone requirements would not
pass, you may request a referral from the Licensing and Registration Unit to The Office of
Zoning and Administrative Hearings for a conditional use. Call the Licensing and
Registration Unit for more information or to obtain a referral at 240-777-0311.
*Note: Requirements as outlined in Zoning Ordinance Section 59-G-2.00 do not apply to properties within the incorporated Municipalities of
Barnesville, Gaithersburg, Laytonsville, and Rockville. For further information, contact your local municipality.
Fact_Sheet.pdf (09/26/2016)