New Second Units
Homeowners planning to construct a new second unit are required to complete the building permit process.
Please note that you must provide a digital copy of architectural and HVAC drawings that show the proposed second unit in compliance with the Ontario Building Code and Zoning By-law before proceeding to the next steps. We strongly recommend that you obtain the services of a design professional (architect, engineer, qualified designer) for these drawings.
1. Apply for a building permit: create an ePlans account at www.mississauga.ca/eplans and submit a Building Permit Application (BPA)request. (Average time to building permit issuance is 9 weeks)
Once a building permit has been issued and all necessary inspections have been completed, the second unit will be registered it will be added to the registry list. A copy of the second unit registration certificate will be mailed to the registration applicant.
Building Permit information/requirements are available at
For those that already have a complete building permit for a new second unit, please complete the registration application form and submit it at the Planning and Building Customer Services Centre on 3rd Floor, 300 City Centre Drive, Mississauga during regular business hours to be added to the Second Unit Registry.