Canadian · Skilled Trades
TSSA fuels contractor lookup.
In Ontario, businesses doing fuels work (natural gas, propane, oil, chimney liners) must be registered with TSSA. TSSA publishes a searchable registry of Registered Fuels Contractors. Check a registration number's pattern here, then search the registry.
Important, up front: TSSA says Registered Fuels Contractors are the only businesses legally authorized to do fuels-related work in Ontario. The registry lists companies, not individual gas technicians: TSSA's pages describe no public lookup for individual G1/G2/G3 certificates.
Check a registration number
Result
Enter a registration number and press Check.
What the registry shows
Each listing shows the company name, an authorization number and an address. You can search by company name or authorization number, by city or postal code, and by fuel type (fuel oil, natural gas, liquid propane, chimney liner). TSSA says the city or postal code refers only to the contractor's main office, that the tool is updated at the beginning of each month, and that listing is not an endorsement or referral.
G1, G2 and G3
TSSA lists Gas Technician 1 (G.1), Gas Technician 2 (G.2) and Gas Technician 3 (G.3) among its Fuels Safety certifications. Its page does not define their scope here; its requirements show the levels differ, for example a G1 challenge application requires proof of 3,500 hours at the G2 level and 500 hours of supervised work on equipment exceeding 400,000 BTUH. For questions about a technician's certificate, use the contact details on TSSA's fuels certification page.
Related checks
The technician's trade credential, where one applies, is a different record; see the Skilled Trades Ontario register guide.
Sources
- TSSA: Find a Registered Fuels Contractor (retrieved October 2026)
- TSSA: Fuels industry professional certifications (retrieved October 2026)
Frequently asked questions
How do I check a gas contractor in Ontario?
Search TSSA's Registered Fuels Contractor registry by company name or authorization number. Only companies with a valid TSSA registration are listed.
What does an FS-R number look like?
Listings in TSSA's registry show FS-R- followed by five digits, for example FS-R-53842. That pattern is read from the examples, not from a published rule.
Can I look up an individual gas fitter?
TSSA's registry and certification pages do not describe a public lookup for individual technicians. Ask to see the certificate and contact TSSA if you need confirmation.
How current is the registry?
TSSA says it is updated at the beginning of each month.
Guide and shape check only — not a verification
This page does not query, copy or proxy any register and cannot confirm anyone's licence, certificate or registration. Anything you type stays in your browser. Only the official register linked above can confirm current status, and rules can change, so check the source before you rely on this page.