Does a Toronto home ductwork installation require an HVAC contractor with a G2 gas licence?

Not necessarily — it depends on whether the ductwork installation involves any gas connections or combustion equipment. If you're only installing or modifying ductwork without touching gas lines, furnaces, or other gas appliances, a G2 gas licence isn't required.

When G2 Gas Licence IS Required (TSSA Registration)

Any work involving gas connections absolutely requires a TSSA-registered contractor with proper gas licensing. This includes connecting a new furnace to existing ductwork, installing gas-fired make-up air units, relocating gas lines for ductwork routing, or any work on gas water heaters, fireplaces, or other combustion appliances. Even if you're just installing new ductwork but need to disconnect and reconnect the furnace gas line to access the plenum connections, that gas work must be done by a TSSA-registered contractor.

The Technical Standards and Safety Authority (TSSA) regulates all gas work in Ontario, and performing gas connections without proper registration is illegal and extremely dangerous. Improper gas connections can cause carbon monoxide leaks, gas leaks, or combustion problems that can be deadly. Always verify that any contractor doing gas work shows you their current TSSA registration card.

When G2 Gas Licence is NOT Required

Pure ductwork installation — installing new supply and return ducts, replacing existing ductwork, adding branch runs to existing systems, duct sealing, insulation, or installing exhaust systems — doesn't require gas licensing if no gas connections are involved. Sheet metal contractors, HVAC contractors, and general contractors can perform this work. However, if the project requires building permits (new duct systems, major modifications, make-up air systems), the work must still be done by qualified professionals and inspected.

Electrical Licensing Requirements

Remember that any electrical work associated with ductwork projects — wiring exhaust fans, thermostats, zone damper motors, ERV/HRV controls, or make-up air system controls — must be performed by an ESA-Licensed Electrical Contractor. This is separate from gas licensing but equally important for code compliance and safety.

Practical Advice for Toronto Homeowners

When hiring for ductwork projects, ask contractors upfront about their licensing. A full-service HVAC contractor with both TSSA gas registration and ESA electrical licensing can handle complete projects including any gas or electrical connections. Specialized sheet metal contractors may focus only on the ductwork installation and coordinate with separate gas and electrical trades. Both approaches work — just ensure all required licenses are in place before work begins.

For ductwork-only projects like adding returns to bedrooms, installing dryer vents, or sealing existing ducts, focus on finding contractors with strong sheet metal and ductwork experience rather than gas licensing. For complete system installations or furnace replacements with new ductwork, TSSA registration becomes essential.

Need help finding a ductwork contractor with the right licensing for your project? Toronto Ductwork can match you with qualified local professionals through the Toronto Construction Network.