Registering a second unit

A second unit, also referred to as a basement apartment, in-law suite or accessory dwelling, is a self-contained living space with cooking, sleeping and sanitary facilities within a detached, semi-detached house or townhouse.

All second units must meet the Ontario Building Code, Ontario Fire Code and Zoning By-law requirements and must be registered with the City as stated in the Second Units Registration By-law.

Register an existing second unit

There is no fee to register a second unit. You may need to pay for a building permit, fire inspection fees or any professional design work and renovation costs your second unit may require.

To register a second unit, email the following documents to secondunits@mississauga.ca:

• Proof of ownership such as a tax bill, title of property or tax assessment notice
• A copy of the second unit building permit sign off by all concerned City inspectors. If a permit was not obtained, you will need to apply for a building permit. If you don’t have a copy of your permit, please call 311 (905-615-4311 outside City limits)
• Completed Second Unit Registration Form.