Must moving plumbing be permitted in Toronto?

Yes — any work that moves, adds, or modifies plumbing in Toronto requires a building permit and a plumbing permit from the City of Toronto Building Division. This applies whether you're relocating a toilet, moving a drain, adding a new bathroom, or changing supply line locations.

The City of Toronto is explicit about this: plumbing permits are required for any new plumbing rough-in, new drain or water supply connections, and any modifications to existing drain/waste/vent (DWV) systems. The permit process exists to ensure a licensed plumber performs the work and that a City inspector signs off before walls are closed up. If something goes wrong — a drain slopes the wrong direction, a vent stack isn't properly connected, a supply line isn't properly secured — the inspection catches it before it becomes a hidden, expensive problem.

What triggers a plumbing permit in Toronto:

Moving a toilet even a few inches from its original drain location requires a permit. Relocating a vanity drain, adding a new shower drain, roughing in a basement bathroom, or tying into an existing stack all require permits. Even adding a new shut-off valve or extending supply lines to a new fixture location technically falls under the permit requirement if it involves modifying the existing system beyond simple fixture replacement.

What typically does NOT require a permit:

Replacing a toilet in the exact same location with a new wax ring and supply line — no permit required. Swapping a faucet, replacing a showerhead, or installing a new vanity faucet on existing supply lines — no permit required. A cosmetic bathroom refresh (new tile over existing substrate, new vanity in the same location, paint, hardware) generally doesn't trigger a permit requirement, provided no plumbing or electrical is being modified.

The GTA-specific reality worth understanding is that Toronto's older housing stock — particularly pre-war homes in the Annex, East York, Leslieville, and similar neighbourhoods — often has cast iron drain stacks and galvanized supply lines that are 70-100 years old. When a plumber opens a wall to move a drain in one of these homes, they frequently discover deteriorated pipe that needs to be addressed at the same time. Having a permit and inspector involved protects you — the inspector verifies the new work meets current Ontario Building Code standards and that any discovered issues are properly resolved.

For condo owners, the permit requirement is compounded by building management approval. Most condo corporations in Toronto require you to submit renovation plans, contractor insurance certificates, and WSIB clearance before any work begins — and the building's own rules about shared plumbing stacks may further restrict what can be moved at all. Budget 2-6 weeks for condo board approval before a plumber can even start.

The resale risk of skipping permits is real. Unpermitted plumbing work is one of the most common red flags flagged by home inspectors during real estate transactions in Toronto. If a buyer's inspector discovers that a bathroom was renovated without permits, the buyer can demand the work be opened up for inspection, require it be brought to code, or use it as leverage to renegotiate the sale price. The City of Toronto can also require you to expose the work for inspection at your own cost — even years after the renovation was completed.

Always hire a licensed plumber for any drain or supply work, and ensure they pull the required permits. A plumber who suggests skipping the permit to save money is not someone you want working in your walls. The permit fee itself is modest relative to the total cost of a bathroom renovation — typically a few hundred dollars — and the protection it provides is significant.

If you're planning a bathroom renovation that involves moving plumbing, Toronto Bath Remodeling can match you with licensed bathroom renovation contractors and plumbers in your area. Browse professionals through the Toronto Construction Network directory at torontoconstructionnetwork.com.