Top One Plumbing Inc.

Customer reviews

This business has 374 Google reviews. We show up to five of them below - read the full listing on Google before deciding.

Sara Zhang

Jan 27, 2026

I waited till a month after the job to make sure everything is okay before posting my review. Mark and his colleague did an amazing job. They took care of a complex issue another plumber could not fix. Thank you for taking care of the issue so professionally!

Chris

Jan 16, 2026

Great experience. After not hearing back from another plumber, Mark responded within 5 minutes of my enquiry. Despite being in the middle of a snowstorm, he showed up and did an excellent job keeping me informed through the entire process. Highly recommend.

Jennifer Munro Galloway

Jan 4, 2026

Professional, responsive, kind, not to mention very reasonable price wise. No one else we’d call to be honest. Been using him for several years now. Zero issues with his repairs to date. Always courteous. Always explains what the price is upfront. Shows up when he says he’s going to show up. We could not recommend Mark more and are quick to recommend him.

Patrick Juan

Oct 29, 2025

Great experience! Mark did a fantastic job fixing our shower and sink. He was on time, friendly, and really knew his stuff. Everything works perfectly now — highly recommend this plumbing company

Pablo Adjei-Kyeremeh

Oct 20, 2025

Mark has always been there for our company whenever we need a job done. His skills and professionalism have helped us modernise our place for the benefit of our clients. Highly recommend him for anyone who needs his services and experience.

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Before you hire a plumber in Ontario

Yes. Plumber (306A) is a compulsory trade in Ontario - working without certification is illegal, not just inadvisable.

Certificate of Qualification, 306A Plumber

The individual doing the work must hold this, or be a registered apprentice working under someone who does. Ask for the certificate number and the name it is issued to. It belongs to a person, not a company.

Verify with: Skilled Trades Ontario maintains the public register of certified tradespeople.

Check Top One Plumbing Inc. on the official register

General liability insurance

Two million dollars is the common floor for residential work. Water damage escalates fast, and a burst supply line during a renovation can exceed a small policy in an afternoon.

WSIB clearance

If a worker is injured on your property and the contractor has no coverage, you can be drawn into the claim. A clearance certificate is free for the contractor to pull and takes minutes.

Verify with: WSIB issues clearance certificates directly to the contractor on request.

Check Top One Plumbing Inc. on the official register

TSSA gas technician certificate (only if gas is involved)

G1, G2 or G3 depending on scope. Required for anything connecting to a natural gas or propane line.

Verify with: The Technical Standards and Safety Authority regulates fuel safety in Ontario.

Check Top One Plumbing Inc. on the official register

Questions worth asking

Is the person doing the work certified in 306A, or an apprentice being supervised? Both are fine. You just want to know.
Is this quote flat rate or time and materials? If hourly, what is the estimated range and what happens if it runs over?
Does the job touch a gas line, and if so who holds the TSSA certificate?
Does this need a municipal plumbing permit, and are you pulling it?
What is the warranty on labour, separately from the manufacturer warranty on parts?

Read the full plumbers hiring guide