Every Ontario contractor knows the two documents a GC demands: WSIB clearance and a certificate of insurance. Plenty of contractors, especially early on, quietly believe the first one is the insurance. It isn't. WSIB is workplace-injury coverage for workers — a crucial, mandatory system that does exactly nothing when your apprentice floods a client's kitchen, your saw walks off a site, or a deck you built two summers ago lets go.
The contractor's real coverage stack sits beside WSIB, not inside it. Here's the whole thing, layer by layer, with the traps marked.
What WSIB does — and precisely where it stops
WSIB compensates covered workers injured on the job and, in exchange, generally bars them from suing their employer. That's the system working as designed. What it never touches: injuries to third parties (the homeowner, the passer-by, another trade's worker suing you as a non-employer), damage to anyone's property, your own tools and equipment, your vehicles, or the quality and consequences of your work.
Note also who can fall outside WSIB's bar — independent operators, some volunteers and family arrangements — which is why employers' liability coverage exists as the backstop for injury claims WSIB doesn't absorb. Declare your real workforce mix and the gap closes cheaply.
CGL: the certificate everyone's actually asking about
Commercial general liability is the policy behind the site-access certificate: third-party injury and property damage arising from your operations. Residential work commonly runs at $2 million; municipal, institutional, and larger commercial contracts demand $5 million — check before bidding, not after winning.
Two wording details earn their space here. Completed operations: the coverage that follows your work after you've left — the plumbing connection that fails in month eight, the railing that gives in year two. Trades live and die on this tail; confirm it's there and matched to your CGL limit. And declared operations: policies cover the trades you told the insurer about. Adding demo, roofing, or snow work mid-year without declaring it is the classic contractor coverage gap.
Tools, equipment, and the truck
Tool theft is the trade's chronic loss — trailers emptied overnight, sites picked clean on weekends. A tools and equipment floater follows your gear on site, in transit, and in storage, with the wording detail that decides real claims: theft-from-vehicle conditions. Some policies require locked, out-of-sight storage; some exclude overnight vehicle theft entirely. Match the wording to how you actually work, schedule the big-ticket items, and blanket the small stuff.
Commercial auto covers the trucks doing business duty — personal auto policies can deny business-use claims — and if employees ever run site errands in their own vehicles, non-owned auto liability is the two-line endorsement that keeps their fender-bender from becoming your uncovered claim.
The project layer: builder's risk and bonds
Your CGL protects things around your work; it largely excludes the work itself. On projects of any size, builder's risk insures the structure and materials during construction — the contract says who buys it, and 'we each assumed the other did' is a conversation to never have. As you graduate to public and larger private work, surety bonds — bid, performance, labour and material — become the ticket to tender. Bonding is underwritten on your financials, so the time to build capacity is before the tender that needs it.
What the stack costs: honest ranges by trade
Premium reality for Ontario trades, in ranges wide enough to be honest: a solo finishing carpenter might assemble CGL plus tools for $2,000–$3,500 a year. A three-person plumbing or electrical outfit commonly lands $4,000–$8,000 across CGL, tools, and commercial auto, with completed-operations exposure priced into the liability. Higher-hazard trades — roofing, demolition, structural work — occupy their own tier, where $10,000+ programs are normal and market access matters as much as price, because fewer insurers write the class at all.
The rating drivers you control: declared operations accuracy (the premium difference between 'renovations' and 'renovations including structural and roofing' is real, and so is the claim-denial risk of fudging it), revenue honesty, subcontractor usage — insurers rate heavy sub usage differently, and your sub-certificate discipline directly affects it — and claims history, the compounding asset. Safety credentials help at the margins: WSIB clearance obviously, but also documented fall-protection training and COR-adjacent programs for larger operations.
Structure the buying around your contract reality: if your GCs demand $5 million, price the umbrella at bind time rather than mid-season; if your work is 70% one trade and 30% another, say so — blended classifications usually beat worst-case-trade pricing. And expect the market to reward tenure: trades that stay claims-free with one insurer for three years have earned negotiating capital worth using at renewal.
A claim walkthrough: the deck, two summers later
The completed-operations scenario, composited: a carpenter builds a deck in June 2023, invoices, moves on. August 2025, a guardrail post fails during a family barbecue; a guest falls, breaking an ankle badly enough for surgery. The homeowner's insurer pays the injury-adjacent costs, subrogates, and the carpenter — two years and forty projects later — receives a claim alleging negligent construction. The governing policy is the one in force now, responding through its completed-operations coverage to work performed then.
The defence file assembles from whatever survived: the contract and drawings, material receipts showing the hardware spec, photos taken at completion, and — decisive in this composite — a text thread in which the homeowner declined the upgraded post-anchoring option the carpenter recommended. Expert review splits causation between an installation detail and post-purchase modifications the homeowner made; the claim resolves within limits at a fraction of the demand, defence costs carried by the policy throughout.
The morals are unglamorous and total: completed-operations coverage is the trade's long-tail lifeline — confirm it exists and matches your CGL limit; project documentation is claim currency years after margins are spent — keep contracts, photos, and change records like tax files; and written recommendations the client declined are the strongest sentence a trade's file can contain. Build all three habits now, because 2027's claim about 2025's work is already scheduled somewhere.
Subcontractors: the certificate discipline that protects your rating
The moment you sub work out, your insurance file grows a dependency: your subs' coverage. Uninsured subs are a double exposure — their incidents climb to you as the GC of record, and insurers rate contractors partly on sub-certificate discipline, sometimes charging premium on uninsured subcontractor payments at audit. The professional baseline: every sub provides a certificate showing CGL at limits matching yours and WSIB clearance before first day on site, filed and diarized for expiry.
Make it contractual, not conversational: a one-page subcontract that flows down your insurance requirements, confirms independent-contractor status, and includes indemnity language — your lawyer drafts it once, it serves for years. For recurring subs, collect renewal certificates annually like clockwork; for one-off specialists, no certificate, no site access, no exceptions, because the exception is always the claim.
This discipline pays three ways: claims route to the right policy instead of defaulting to yours, your premium audit goes smoothly (documented insured subs price better than mystery labour), and GCs above you — who run the same system — recognize a subcontractor who understands the game. In a referral trade, that recognition is quietly worth more than the paperwork costs.
Growing the operation: from truck to fleet to bids
The stack scales at recognizable thresholds. Second and third vehicles: consolidate toward fleet structure around five units, and put non-owned auto in place the first time an employee runs for materials in their own car. First employees beyond family: employers' liability questions sharpen, and the sub-versus-employee classification you use has WSIB, CRA, and insurance consequences worth aligning deliberately. First $2M+ contract: umbrella limits, richer certificate requirements, and sometimes project-specific insurance named in the contract documents.
First public tender: the bonding conversation — bid, performance, labour-and-material — which runs on financial statements and takes a year of preparation to do well. First out-of-province job: licensing and insurance territory questions per province, plus travel exposures for crew and tools. Each threshold is predictable, which means each is schedulable: flag the growth plan to your broker annually and the insurance arrives before the milestone instead of chasing it.
The through-line for a growing contractor: your insurance file is infrastructure, like the trailer and the yard. Maintained on schedule it compounds quietly in your favour — market access, pricing, claim outcomes, GC relationships. Neglected, it surfaces at exactly the moments (the big bid, the bad claim, the audit) when repair is most expensive. Build it with us properly once, then maintain it with two emails a year.
The bottom line
WSIB plus a real stack: CGL with completed operations at contract-driven limits, tools coverage worded for your truck, commercial auto, employers' liability for the workforce edges, builder's risk per project, bonding as you grow. That's the full kit — and assembled together it usually costs less than the sum of its pieces bought in panic.
Send us your trade mix and a typical contract's insurance clause, and we'll build it properly — start here. Certificates same-day once you're bound, because we know exactly what the GC's portal is going to ask for.