Mississauga basement permit: when you need one and what to submit
The short answer
Yes. Finishing a basement to create rooms or living space needs a building permit. City fee: $5.64 per m², minimum $244.
Last verified 2026-10-07 · City of Mississauga: When a building permit is required, City of Mississauga: 2026 classes of permits and fees (PDF), City of Mississauga: Registering a second unit- City fee
- $5.64 per m², minimum $244
- Where to apply
- City of Mississauga ePlans
- Review time
- Pre-screening takes 7 to 10 business days, then the first review of a complete house application takes 10.
You sign a letter confirming you aren't adding a second unit. A second unit needs its own permit and has to be registered with the City, which is free.
What an application usually includes
Mississauga’s checklist has the exact list; apply through City of Mississauga ePlans.
- Existing and proposed floor plans with room names and sizes
- Ceiling heights, beams and ducts
- Window details for bedroom escape
- Insulation and energy information, and heating and ventilation where they change
- The application form and the owner or designer declaration
Local quirks
- ePlans wants unlocked greyscale PDFs, one drawing per file, each named to match its title block.
- Resubmissions have no guaranteed review time, and each round can add two weeks or more.
Design your Mississauga basement to the Building Code.
The design, drawings and code checks work in Mississauga today. Mississauga’s own forms aren’t built in yet, so you’ll fill those in on the City’s portal.