Register a second unit in Mississauga
How do I register a basement apartment or second unit in Mississauga?
Mississauga requires second units to meet building, fire and zoning requirements and be registered. Registration is separate from permission to build or renovate the unit.
Application steps
- Identify whether you are registering an existing second unit or proposing new residential units. New construction needs a building-permit application.
- For a new unit, check the property's zoning and work with a qualified designer on compliant plans before applying through ePlans.
- For registration, obtain the second-unit building permit with sign-off from all concerned City inspectors. Apply for a permit if none was obtained.
- Gather proof of ownership and complete the City's Second Unit Registration Form. Ask 311 for assistance if you lack your permit copy.
- Email the registration form, ownership evidence and signed-off permit to secondunits@mississauga.ca.
- Check the City's Second Units Registry List after registration; it is updated monthly.
Before you open the official service
- Ownership evidence
- Signed-off second-unit permit
- Registration form
Keep your actual documents and account details off this website. Use the official service’s current checklist before applying.
What to check for your situation
Registration itself has no fee, but permits, inspections, design and construction may cost money. A registration request does not establish code compliance.
Fees, processing times and document rules can change. This page helps you navigate; it does not confirm eligibility or replace the government’s instructions.
Official sources
mississauga.ca · Official websiteCity of Mississauga — Registering a second unitRegistration is submitted by email with ownership evidence, permit sign-off and a form. Registration and construction costs are distinct.Checked - mississauga.ca · Official websiteCity of Mississauga — Building more units on your propertyNew residential units require a building permit. The City directs applicants to property zoning, design preparation and ePlans.Checked
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