Guide to Registering a Second Unit in Mississauga: Requirements and Process

Guide to Registering a Second Unit in Mississauga: Requirements and ProcessIn Mississauga, a second unit, often known as a basement apartment, in-law suite, or accessory dwelling, offers homeowners the opportunity to maximize space and enhance property value. However, before renting out or utilizing a second unit, it’s crucial to ensure compliance with municipal regulations. This guide will walk you through the process of registering a second unit in Mississauga, covering everything from building permits to documentation requirements.

Understanding Second Units: A second unit is a self-contained living space within a detached, semi-detached house, or townhouse, equipped with cooking, sleeping, and sanitary facilities. To maintain safety and compliance, all second units must adhere to the Ontario Building Code, Ontario Fire Code, and local Zoning By-law requirements.

Building Permit Requirements: If you’re planning to construct a new second unit or your existing unit was built after July 14, 1994, you will need to obtain a building permit. This permit ensures that the unit meets safety and structural standards outlined in the Ontario Building Code.

Registering an Existing Second Unit: Registering an existing second unit involves submitting necessary documentation to the City of Mississauga, as per the Second Units Registration By-law. There is no fee for registration, but you may incur costs associated with building permits, fire inspection fees, or renovation work.

Registration Process: The process for registering your second unit depends on its construction date:

  1. Second Units Built Before July 14, 1994:
    • Email the completed Second Unit Registration Form and a sealed affidavit signed by a lawyer to
    • Await inspection by Fire Prevention and Life Safety Staff, providing a current Electrical Safety Certificate if required.
    • Address any identified issues outlined in the ‘Fire Inspection Order’ and obtain a ‘clearance letter’ from the Fire Inspector.
    • Upon receiving the clearance letter, the City’s Building Division will register your second unit, issuing a registration certificate via email.
  2. Second Units Built After July 14, 1994:
    • Email proof of ownership, a copy of the second unit building permit, and the completed Second Unit Registration Form to
    • Ensure all concerned City inspectors have signed off on the building permit.
    • If a permit was not obtained, apply for a building permit or contact 311 for assistance.
    • After staff review, your second unit will be registered, and a registration certificate will be emailed to you.

Conclusion: Registering a second unit in Mississauga is a straightforward process but requires adherence to municipal regulations and documentation. We at IRVI Design always guide you to ensure that your application is complete, accurate, and in alignment with the applicable laws to facilitate a smooth processby following the steps outlined in this guide and ensuring compliance with building codes, you can enjoy the benefits of a registered second unit while maintaining safety and legality.