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1. What is an ADU?

Accessory Dwelling Unit (ADU) is a residential unit that can be added within an existing single family home or as an addition to a single family home (attached), created by a garage conversion (attached or detached), or added as a new structure on your lot (detached). In all cases, ADUs are independent units that have their own kitchens, bathrooms, living areas and entrances. 

From City Code: “an accessory building, or portion of a building, designed or used exclusively for residential occupancy that is located in a single family dwelling or on the same lot and is subject to the use standards in Section 21.64.010 of the Annapolis City Zoning Code and the bulk regulations for buildings accessory to single family dwellings.” 

2. Why build an ADU?

ADUs can provide additional space for caregivers, grown children, elderly parents, or renters. Because ADUs can be rental units, they may produce additional income for the homeowner. “Empty-nesters” may be able to stay in their neighborhoods by moving into a smaller ADU and renting their larger existing home to pay the mortgage.

3. Are ADUs permitted in all neighborhoods?

ADUs are permitted in most residential zoning districts (R1A, R1B, R1, R2, R3, R3-R, R4, R4-R) and may be permitted with a special exception in other residential zoning districts (R2-NC,  R3-NC,   R3-NC2,  C1, C1A). Check your zoning on the City’s website

4. How many ADUs can I build on my lot?

A maximum of one accessory dwelling unit may be established on any one lot. The ADU must have its own separate entrance.

5. Does the owner need to live onsite?

Yes. In either the main dwelling or in the ADU.

6. How big can my ADU be?

The maximum size of any ADU is 850 square feet of livable space (unless it is in the footprint of an existing dwelling such as in the basement of an existing house).

7. If I rent my ADU, do I need a license?

Yes. A rental license and inspection by the City of Annapolis Department of Planning and Zoning is required for any rented ADU. Rentals may be short- or long-term.

8. Is additional parking required?

No.

9. Do I need to meet environmental standards?

If the addition of an ADU will create an additional impervious surface on the lot, treatment or management of stormwater will be calculated and a mitigation strategy must be implemented.  There may be other requirements depending on the limit of disturbance and if any trees or vegetation will be removed. Contact the Department of Planning and Zoning for more information.