When Do You Need a Permit for Home Renovations in Ontario?

The General Rule: Structural = Permit, Cosmetic = No Permit

The Ontario Building Code requires a building permit for any construction, demolition, or change of use of a building. In practical terms for home renovations, this means: if your renovation involves changing the structure, layout, or systems of your home, you need a permit. If it's purely cosmetic — changing surfaces, finishes, or fixtures without modifying the underlying structure or systems — you generally don't.

However, the line between 'cosmetic' and 'structural' is not always obvious. Removing a wall that looks non-structural might actually be load-bearing. Replacing a bathtub might require moving plumbing. Adding pot lights might require modifying the electrical panel. When in doubt, call your local building department — they'll tell you whether a permit is required, and the call is free.

Renovations That DO Require a Building Permit

The following home renovation projects require a building permit in Ontario:

Renovations That Generally Do NOT Require a Permit

The following renovations typically do not require a building permit in Ontario, though you should always check with your municipality:

Painting interior or exterior walls. Replacing flooring (hardwood, tile, carpet, vinyl). Installing new kitchen cabinets (without moving plumbing or electrical). Replacing countertops. Replacing interior doors (same size opening). Replacing fixtures in the same location (toilet, faucet, light fixture). Installing backsplash or wall tile. Replacing drywall in the same location. Landscaping and gardening. Replacing a roof covering (shingles) without modifying the structure. Replacing windows with the same size windows (no structural modification).

Important caveat: even 'cosmetic' renovations must comply with the Ontario Fire Code. For example, you cannot block fire exits, remove smoke detectors, or use materials that don't meet fire-resistance requirements.

Kitchen and Bathroom Renovations: The Grey Area

Kitchen and bathroom renovations are the most common source of confusion about permits in Ontario. Here's a simple guide:

Kitchen renovation WITH a permit: moving the sink or dishwasher to a new location, adding a gas line for a new range, removing a wall between kitchen and dining room, adding new electrical circuits for appliances, moving the kitchen to a different room.

Kitchen renovation WITHOUT a permit: replacing cabinets in the same layout, new countertops, new backsplash, replacing appliances (same location, same connections), new flooring, painting.

Bathroom renovation WITH a permit: adding a new bathroom, moving the toilet or shower to a new location, adding a bathtub where there wasn't one, modifying the ventilation system.

Bathroom renovation WITHOUT a permit: replacing the toilet (same location), new vanity and sink (same location), new tile, new fixtures (faucets, showerhead), painting, replacing the exhaust fan (same location).

Consequences of Renovating Without a Permit

Renovating without a required permit in Ontario can have serious consequences. Fines range from $500 to $50,000 depending on the municipality and severity. The municipality can issue a stop-work order, halting all construction. You may be required to open up finished walls and ceilings for inspection, or even demolish completed work that doesn't meet code.

Perhaps most importantly, unpermitted work can cause problems when you sell your home. Home inspectors and buyers' lawyers routinely check permit records. Unpermitted work can reduce your home's value, delay or kill a sale, and create insurance and liability issues. The cost of getting a permit is always less than the cost of dealing with unpermitted work later.