What types of bathroom work require a permit versus what can be done without one in Ontario?

The dividing line is straightforward: cosmetic work that does not touch plumbing, electrical, or structure is permit-free, while anything that modifies these systems requires permits under the Ontario Building Code. Understanding this distinction helps you plan your GTA bathroom renovation timeline and budget accurately.

Work That Does NOT Require a Permit

You can freely replace your bathroom vanity, toilet, and faucets in the same locations without a permit, provided you are not modifying the plumbing connections — just disconnecting and reconnecting at the same rough-in points. Other permit-free work includes replacing tile on floors and walls (as long as you are not modifying the waterproof membrane system or subfloor structure), painting with mould-resistant bathroom paint, installing new mirrors or medicine cabinets, replacing bathroom hardware like towel bars and toilet paper holders, re-caulking around tubs and showers, and replacing a showerhead or hand shower on the existing arm.

Swapping a vanity faucet, replacing a toilet with one that matches the same rough-in measurement (typically 12 inches in most Toronto homes), or installing a new vanity cabinet with the sink drain in the same position — all of these are straightforward replacements that do not trigger permit requirements.

Work That DOES Require a Permit

Plumbing permits are required for: adding a new bathroom (including basement bathroom rough-ins), relocating a toilet, sink, or shower drain, modifying the drain/waste/vent system, adding new water supply connections, and installing a new backwater valve. In Toronto, plumbing permits are obtained through the City of Toronto Building Division, and the work must be performed by or under the supervision of a licensed plumber.

Electrical permits are required for: adding new GFCI outlets, installing heated floor circuits, wiring a new exhaust fan, adding or relocating vanity lighting circuits, and any modifications to existing bathroom wiring. All electrical permits in Ontario require an ESA (Electrical Safety Authority) inspection before the work is concealed.

Building permits are required for: removing or modifying walls (especially load-bearing walls), enlarging a bathroom by taking space from an adjacent room, adding a new window or enlarging an existing one, and modifying floor structure to accommodate a curbless shower or new drain location.

The Grey Areas

Some projects fall into a grey area that homeowners find confusing. Replacing a tub with a custom tiled shower, for example, involves waterproofing modifications and potentially a new drain configuration — this typically requires a plumbing permit even though the fixture location has not changed significantly. Installing a bidet seat that requires a new electrical outlet needs an electrical permit for the new circuit. Converting a bathtub alcove to a walk-in shower with a linear drain involves modifying the drain location and subfloor — permit required.

When in doubt, call the City of Toronto Building Division at 416-397-5330 or visit their website. A five-minute call can confirm whether your specific project needs permits. Budget $150–$500 for permit fees depending on scope, and allow 2–4 weeks for approval on standard residential bathroom projects in the GTA.