Permit Requirement Checker — Ontario
Select your renovation type to see if a permit is typically required in Ontario:
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Get KOHO Free — Code 45ET55JSYARenovation Permit Requirements in Ontario: The Complete Guide
In Ontario, building permits are issued by individual municipalities (City of Toronto, City of Ottawa, City of Hamilton, etc.) under authority of the Ontario Building Code (OBC). The OBC is a provincial standard, but permit applications and inspections are administered locally. This means permit costs, processing times, and exact requirements can vary significantly between municipalities.
When Do You Need a Building Permit in Ontario?
Under the Ontario Building Code, a permit is generally required for:
- Any structural renovation or addition to a building
- Creating new or moving existing plumbing (rough-in, drain relocation)
- Electrical panel upgrades, new circuits, or service changes (also requires ESA permit)
- Installation of new or replacement HVAC systems
- Basement underpinning or major structural changes to foundation
- Creating a secondary suite/apartment within a dwelling
- Building a new deck over 600mm (24 inches) above grade
- Any addition to a building, regardless of size
Generally NOT requiring a permit: interior cosmetic work (paint, flooring, kitchen cabinet replacement, countertop replacement — unless plumbing moves), same-size window/door replacement, minor drywall repairs, insulation added to existing spaces without structural change.
The Ontario Building Permit Process
1. Submit permit application to your local municipality's building department. Applications can often be submitted online through municipal portals. 2. Pay the application fee (calculated based on project type and valuation). 3. Building department reviews drawings and specifications (2 days to 20 business days for residential). 4. Permit issued — construction can begin. 5. Post permit placard visibly at job site. 6. Book inspections at key stages (framing, insulation, drywall, final). 7. Final inspection and occupancy approval.
Building Permit Costs by Municipality (Ontario)
| Municipality | Residential Permit Fee | Processing Time |
|---|---|---|
| City of Toronto | $24.12/m² (min $196) | 10–20 business days |
| City of Ottawa | $12–$20/m² of project area | 5–15 business days |
| Peel Region (Mississauga) | $18–$25/m² | 5–10 business days |
| City of Hamilton | $10–$18/m² | 5–10 business days |
| City of London | $8–$15/m² | 3–10 business days |
| Smaller municipalities | $5–$12/m² | 3–7 business days |
What Happens If You Don't Get a Required Permit?
Skipping permits creates serious risks for Ontario homeowners:
- Stop-work orders: Your municipality can halt construction and require work to be exposed for inspection (tearing out finished drywall to check hidden electrical work).
- Fines: Most Ontario municipalities charge double or triple permit fees for unpermitted work discovered during inspection, plus the original permit cost.
- Resale complications: Home buyers' lawyers request permit history. Unpermitted work can kill deals, require mandatory disclosure, or trigger price renegotiation.
- Insurance issues: Your home insurer may deny claims related to damage caused by unpermitted work.
- Mortgage complications: Lenders may refuse to approve financing on homes with unpermitted work identified in an appraisal or inspection.