What Requires a Licensed Plumber in Ontario?

In Ontario, all new plumbing work — including adding pipes, installing fixtures in new locations, and replacing water heaters — requires a permit under the Ontario Building Code and must be done by a licensed plumber. The only work homeowners can legally do themselves without a permit is like-for-like repairs: replacing a faucet in the same location, fixing a leaking trap, or swapping a toilet. Any work that involves opening walls or changing pipe routing requires a licensed plumber and permit.

How Much Does a Plumber Cost in Ontario (2026)?

Finishing a basement in Ontario often involves adding a bathroom or wet bar, which requires rough-in plumbing work. A plumber will cut the concrete floor to tie into existing drain lines, install floor drains and waste lines, then pour concrete to cover. This is called a "basement rough-in." Costs range from $2,000–$5,000 for a basic bathroom rough-in. All basement plumbing work requires an Ontario Building Code permit.

How Water Heater Installation Works

Finishing a basement in Ontario often involves adding a bathroom or wet bar, which requires rough-in plumbing work. A plumber will cut the concrete floor to tie into existing drain lines, install floor drains and waste lines, then pour concrete to cover. This is called a "basement rough-in." Costs range from $2,000–$5,000 for a basic bathroom rough-in. All basement plumbing work requires an Ontario Building Code permit.

How to Finish a Basement — Plumbing Considerations

Finishing a basement in Ontario often involves adding a bathroom or wet bar, which requires rough-in plumbing work. A plumber will cut the concrete floor to tie into existing drain lines, install floor drains and waste lines, then pour concrete to cover. This is called a "basement rough-in." Costs range from $2,000–$5,000 for a basic bathroom rough-in. All basement plumbing work requires an Ontario Building Code permit.

What Is Plumbing? What Does a Plumber Do Ontario

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