Drain Cleaning Licence Ontario: What Contractors Must Know Before Bidding

What to take away

Who has jurisdiction in Ontario

Drain cleaning sits under three layers of control in Ontario: provincial certification, municipal permits and private property rules. Provincial certification is enforced under the Ontario Trades Qualification and Apprenticeship Act, and municipal permit powers come from the Ontario Building Code Act.

Provincial certification is the first test. Municipal approval does not prove that the worker holds a Certificate of Qualification. A condo board approval does not replace either one.

Ontario's certificate of qualification

Skilled Trades Ontario issues Certificates of Qualification for the compulsory trade of plumber under the Act. The Ontario College of Trades previously handled this work, but Skilled Trades Ontario now administers the certificate and exam process.

Skilled Trades Ontario charges a fee for the certificate exam and a second fee to issue the certificate. The two together are typically in the low hundreds of dollars. Skilled Trades Ontario publishes the current amounts, so confirm them before you price a bid.

In practice, a contractor bidding drain cleaning that reaches a building drain, building sewer or branch line should hold or employ someone who holds the plumber certificate. Simple clearing of a p-trap under a sink needs no building permit, but it still needs the plumber certificate, because the work sits in a compulsory trade.

Some municipalities also license sewer installers separately for private drain connections. A provincial plumber certificate does not automatically grant that local sewer installer licence.

For the wider code framework behind drainage decisions, see National Plumbing Code shapes drain work.

What triggers a municipal permit

A building permit is generally required when a contractor installs, extends, alters, or repairs a building drain or building sewer. A backwater valve installation usually needs a permit because it changes the drainage system.

Simple snaking or hydro jetting that clears an existing blockage needs no building permit. It still needs the plumber Certificate of Qualification, because the work is on a plumbing system in a compulsory trade. A municipal sewer access permit may be needed if the crew opens a public cleanout or manhole.

In Toronto, a building drain or building sewer repair needs a building permit from Toronto Building, and opening a city cleanout or manhole needs separate municipal approval. Ottawa runs the same work through its own building permit process.

Permit fees vary by city and by the value of the work. Residential drain permits typically run from about $150 to $600, and right-of-way or sewer connection permits cost more because engineering review applies. Check the published fee schedule for the city before you bid.

For how city by-laws differ on backwater valves, see Backwater valve rules.

What to submit before bidding

A compliant bid file should travel with the quote. Use this checklist before you submit.

How long approval takes

Provincial certificate confirmation can take several weeks for an out-of-province plumber applying through the Red Seal route. Simple municipal drain repair permits often take five to ten business days after submission.

A sewer cut in a city right-of-way can take three to six weeks because engineering and traffic control drawings may be reviewed. The property owner's condominium or property manager may add two to five business days for access approval.

Contractors should confirm these timelines in writing before promising a start date.

Out-of-province plumbers can review Red Seal certification works to understand how their home certificate transfers into Ontario.

What happens if you skip it

Uncertified plumbing work in Ontario is not a technicality because the ministry enforcing the Trades Qualification and Apprenticeship Act can issue a stop-work order, and a provincial offense charge can follow.

A property owner may refuse payment because the contractor could not lawfully perform the work. An insurer can deny a claim that arises from unlicensed work.

This is the concrete risk: a stop-work order on a drain line can leave an excavated trench open until the work is corrected.

For how a backup claim can unfold after the fact, read sewer backup claim.

In many municipalities, a stop-work order also directs the contractor to expose completed drainage work for inspection before any cover is restored.

Example: A two-unit house drain replacement bid

An Ontario plumbing contractor quotes a collapsed building drain replacement for a semi-detached home. The bid file holds four items: the plumber certificate, insurance certificate naming the homeowner, WSIB clearance certificate, and a copy of the municipal sewer repair permit application.

The contractor confirms with the city that the work is a building drain repair, not a public sewer connection. The contractor records the permit number before starting. The municipal permit fee for work of this size typically runs a few hundred dollars, and the bid should list it as a separate line.

Common questions