We use cookies to keep you signed in and to see what's working and what breaks. No advertising cookies, nothing sold. Details in our Cookie Policy.
Straight answers
The questions people ask most about getting certified and starting and running a steamfitting business in Ontario. Answered straight, with links to the official sources.
For the money, many say yes — but go in clear-eyed. Construction and especially shutdown/turnaround work can mean travelling to plants, living in camps or hotels, and 60–84 hour weeks during a turnaround. The cheques are large (overtime plus per-diem), then there's downtime. It rewards people who want to earn hard and don't mind the travel; it wears on people who want to be home every night.
The welding side is the top of the trade. A journeyperson steamfitter earns a strong union wage and pension; add pressure-welding tickets (ASME/CWB) and the ability to pass an X-ray weld test, and welder-fitters become some of the best-paid hands in construction — in steady demand, with big overtime on shutdowns. Getting your welding qualified and keeping them current is the single best pay move in the trade.
Plumbers (306A) handle potable water, drainage, and venting in buildings. Steamfitters/pipefitters (307A) install high-pressure and process piping — steam, hydronics, compressed gases, and industrial process lines — in plants and large commercial/institutional settings. They're separate compulsory trades, and steamfitting leans industrial, technical, and higher-paid.
Practically, yes for the industrial mechanical world — the UA union route is how most steamfitters apprentice, get the best wages and pension, and get dispatched to plant and shutdown work. There's non-union mechanical work, but the high-paid industrial and shutdown side is overwhelmingly union territory.
A turnaround is a planned plant shutdown where a huge amount of maintenance happens in a compressed window — so it's a burst of intense, well-paid work: long shifts, seven-day weeks, per-diem and travel, for a few weeks to a couple of months, then it ends. Tradespeople chase turnarounds for the money; the rhythm is feast-and-famine, which is why some prefer steadier construction or local maintenance.
Apply through a UA local's apprenticeship or a college steamfitter program tied to the trade — it's a compulsory trade (307A), so you register your apprenticeship with Skilled Trades Ontario. Mechanical aptitude and a willingness to learn welding go a long way; the welding tickets you build along the way are what set up the high-earning career.
Yes. Steamfitter/Pipefitter (307A) is a compulsory trade, so you need the Certificate of Qualification or registered apprentice status to do the work. Pressure piping is additionally regulated by TSSA.
Plumbers (306A) handle potable water, drainage, and venting in buildings. Steamfitters (307A) install high-pressure and process piping — steam, hydronic heating, compressed gases, and industrial process lines — in commercial and industrial settings. They are separate compulsory trades.
Hold or employ 307A steamfitters, incorporate, register for WSIB and CRA, carry high-limit liability insurance, and qualify welding procedures with CWB/ASME if you do pressure work. Most industrial mechanical contractors also register in owner safety-qualification systems like ISNetworld.
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.