Additional Residential Units (ARU)

An ARU is a self-contained dwelling unit located within the same building, or on the same lot, as an existing residential unit. Self-contained means that it has its own kitchen and washroom facilities and a separate entrance.

They can be located within the interior of the existing house (for example in the basement), in an existing garage, or by constructing a detached “tiny home” on the property or as an addition to a single detached, semi-detached, or townhouse dwelling.

Additional Residential Unit (ARU) Guideline

You can have up to 2 separate Additional Residential Units (ARUs) on a residential property where the zoning permits single detached dwellings, semi-detached dwellings, or street townhouse dwellings.

You can convert space in your existing home (including a basement, a 2nd floor, or an attached garage) to create a new ARU. You can also build an addition onto your existing home, or convert an existing detached garage, or build a new detached ARU on your property.

For examples on the different types of ARUs, click here.

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