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Straight answers
The questions people ask most about getting certified and starting and running a sheet metal business in Ontario. Answered straight, with links to the official sources.
Shop fabrication is indoor, precision work — CNC, brakes, layout — and tends to suit people who like the craft and the cleaner environment. Field install is physical and varied, out on site hanging duct and setting rooftop units. Many do both over a career; pay is comparable, and the choice is mostly about whether you'd rather be in a shop or on a site.
308A is the full Sheet Metal Worker trade — commercial ductwork, architectural metal, and fabrication. 308R is the shorter residential low-rise stream focused on home HVAC ducting. 308R gets you working faster but narrower; 308A keeps the commercial and architectural doors open and is the better bet if you want options.
They overlap but aren't identical. Ductwork is sheet metal, so sheet metal workers do a lot of HVAC install — but full HVAC service also needs the refrigeration (313A) and gas (TSSA) tickets to touch equipment and refrigerant. Sheet metal is the fabrication-and-ducting trade; full HVAC layers gas and refrigeration on top.
The SMART (Sheet Metal Workers') union route generally pays more with a pension and structured progression, strong on commercial and ICI work. Non-union is more flexible and common on residential and smaller jobs. Same trade-off as most trades: union for total compensation, non-union for flexibility and the easier base to start your own shop.
Yes — and it's one of the better off-tools moves in any trade. Sheet metal detailers model ductwork and coordinate it (increasingly in BIM) for shops and contractors. It pays well, gets you out of the weather and off the rooftops, and builds directly on the layout and fabrication knowledge you already have.
No licence beyond the trade — a business licence, WSIB, and insurance, plus shop space if you fabricate. Many start as field install subs to HVAC contractors, then add fabrication capacity. The work flows from HVAC contractors, GCs, and architects (for the architectural side), so relationships drive it.
Yes — Sheet Metal Worker (308A) is a compulsory trade. The residential low-rise installer stream (308R) is the residential HVAC ducting trade. You need the certificate or apprentice status to do the work.
308A is the full sheet metal trade — commercial/industrial ductwork, architectural sheet metal, and fabrication. 308R is the residential low-rise sheet metal installer focused on home HVAC ducting. 308R is narrower and can be upgraded toward 308A.
Hold or employ a certified sheet metal worker, incorporate, register WSIB and CRA, and carry liability insurance. If you also connect gas appliances or handle refrigerant you add TSSA gas and ODP requirements — which is why many sheet metal shops operate as full HVAC contractors.
A sole proprietorship is cheaper and simpler to start, but you are personally liable for the business's debts and claims. Incorporating creates a separate legal entity that limits personal liability, can reduce tax once you are profitable, and reads as more credible to larger clients. Most contractors incorporate once they have employees, real revenue, or work on others' property.
Yes — construction is a mandatory WSIB sector in Ontario. Even independent operators and partners with no employees generally must register, and clients and general contractors will require a valid WSIB clearance certificate before you can work on their site.
You must register for and charge HST once your revenue exceeds $30,000 over four consecutive quarters. Many contractors register before that threshold so they can claim input tax credits on tools, materials, and vehicles from day one.
Ontario's Construction Act sets the rules: a 10% holdback on most contracts, prompt-payment timelines (you must be paid within set periods after a proper invoice), and an adjudication process for disputes. Understanding holdback, lien rights, and prompt payment is essential to protecting your cash flow.