Accessory Dwelling Units
This information outlines the requirements for building a new Accessory Dwelling Unit (ADU). Before you begin to design or construct an ADU review the following.
Accessory dwelling units (ADUs) are permitted throughout Ontario on single-detached, semi-detached and street townhouse lots. A maximum of three (3) dwelling units are permitted on a serviced lot. The unit(s) can be located within, or as an addition to an existing dwelling, or in a detached (accessory) structure. Each dwelling unit requires one parking space. For example, where there are 3 units, 3 parking spaces are required.
Three dwelling units are permitted on a serviced lot based on the following configuration(s):
- Three (3) residential units in a detached house, semi-detached house or townhouse if there are no residential units in an accessory structure;
- Two (2) residential units in a detached house, semi-detached house or townhouse if there is no more than one (1) residential unit in an accessory structure;
- One (1) residential unit in an accessory structure if the detached house, semi-detached house or townhouse contains no more than two (2) residential units and no other accessory structures contain any residential units.
Zoning requirements for ADUs include:
- Units located at or above grade are a maximum of 50% of the gross floor area of the principal dwelling or 110 m², whichever is lesser;
- Basement units may occupy the entire basement area, however, *ADU’s are not permitted in the basement of dwellings that are located in the floodplain;
- Parking spaces can be provided in a tandem arrangement; and
- Minimum of 50% of the front yard shall be maintained as landscaped open space.
| Single-Detached Accessory Dwelling Unit |
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Where space allows and parking can be accommodated, single-detached dwellings have the ability to accommodate up to 3 units. The ADU’s can be on the ground floor, second floor, basement*, an addition or in a detached (accessory) structure. Each must be a self-contained unit that has:
Photo Gallery: ADU-SingleDetached will appear here on the public site.
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| Semi-Detached Accessory Dwelling Unit |
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Where space allows and parking can be accommodated, semi-detached dwellings have the ability to accommodate up to 3 units. The ADU’s can be on the ground floor, second floor, basement*, an addition or in a detached (accessory) structure. Each must be a self-contained unit that has:
Photo Gallery: AUD-SemiDetached will appear here on the public site.
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| Townhouse Accessory Dwelling Unit |
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Where space allows and parking can be accommodated, townhouse dwellings have the ability to accommodate up to 3 units. The ADU’s can be on the ground floor, second floor, basement*, an addition or in a detached (accessory) structure. Each must be a self-contained unit that has:
Photo Gallery: ADU-Touwnhouse will appear here on the public site.
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Note: This information is current as of May 2023 and is subject to change as applicable legislation and regulations are amended by the Province of Ontario and/or City of Brantford.
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