Gas fitting covers the installation, repair, and inspection of gas lines and gas-burning appliances: furnaces, water heaters, stoves, BBQ hookups, fireplaces, and outdoor patio heaters. It's one corner of plumbing where you can't shop on price alone. In Ontario, gas work has to be done by someone holding a valid TSSA (Technical Standards and Safety Authority) certification, and the job usually needs a permit and inspection before it's signed off. We've listed 11 gas fitting businesses serving Toronto to help you compare who's actually set up to do this work properly.
What to look for in a gas fitter
Ask to see the technician's TSSA card before work starts, not after. Confirm they'll pull the permit themselves rather than asking you to skip it, since unpermitted gas work can void your home insurance. Get a written quote that separates labour, materials, and permit fees, and ask how they handle a failed inspection. A fitter who explains what they're doing and why, rather than just handing you a bill, is usually the safer bet.
How we score these businesses
Our ranking weighs licensing and credentials, response times, review patterns over time (not just star averages), and how consistently a company follows through on quotes and permits. For the full rundown, see our methodology page, and for the ranked list of top plumbers across all specialties in the city, check out the best plumbers in Toronto guide.