Project template
Your preparation checklist
Use it as a working list. The final submission still needs to match your actual scope and the City’s current requirements.
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What to do next
- Confirm the property and unit configuration
- Prepare conversion drawings
- Apply for the building permit
- Complete inspections and registration requirements
Official sources behind this page
PermitBuilding permit route applies
Mississauga lists basement apartments among permit-required projects and publishes an ARU conversion submission checklist.
City of MississaugaWhen a building permit is required · Permit-required and permit-exempt project examples
2026-10-01Open proof
Conversion documentsDedicated checklist
The City requires project-specific forms and drawings when converting existing space into a second, third or fourth unit.
City of MississaugaAdditional residential unit conversions · Second, third and fourth unit conversion documents
2026-10-01Open proof
RegistrationRequired for second units
Mississauga states that second units must meet code and zoning requirements and be registered with the City.
City of MississaugaRegistering a second unit · Registration, permit and inspection requirements
2026-10-01Open proof
Need the full project answer?
The main guide keeps the permit trigger, zoning questions, documents, fees, timing and next steps together.
Open the additional residential unit / second unit guide