How to Tell a Good Concrete Contractor From a Bad One in Toronto

Unlike an electrician or a plumber, there is no provincial trade licence for concrete work in Ontario. Anyone can put a sign on a truck and call themselves a concrete contractor. That does not mean there is nothing to check, it means the checks that matter are different: a current WSIB clearance certificate, active liability insurance, and, for anything that needs one, a municipal building permit.

A WSIB clearance certificate proves the crew is covered if someone is hurt on your property. Liability insurance covers damage, such as a snapped water line or a slab poured wrong against a shared property line. Both are documents a legitimate contractor can produce in minutes, and both are worth asking for before any deposit changes hands.

Because there is no licence to check, review history does some of the work a licence would elsewhere. A contractor with a long, consistent run of reviews across years is a different bet than one with a handful of five-star reviews and no other public trace. ConcreteFinder ranks listed contractors with that in mind, weighting toward review depth rather than a perfect score on a handful of reviews. The full method is on our methodology page.

None of these on their own is automatically disqualifying, but more than one together is a reason to walk.

A serious quote reads like a scope of work, not a sales pitch. At minimum it should spell out: what gets removed and where the old material goes; how deep the excavation goes and what base material sits underneath; the concrete mix and slab thickness for your specific job; how it is reinforced, rebar, wire mesh or fibre, and where the control joints are cut; the finish, whether broom, exposed aggregate, stamped or polished; the payment schedule and deposit; and what the warranty covers for cracking and settlement, and for how long.

Mix and thickness matter more than most homeowners expect. For a driveway, the published GTA freeze-thaw spec is 32 MPa air-entrained concrete over a compacted granular base, with slab depth generally 5 to 6 inches depending on the installer (see our driveway cost guide for the sourced figures). A contractor who cannot name a mix or thickness for your job is either guessing or planning to cut corners somewhere you will not see until a winter freeze-thaw cycle finds the weak spot.

If two quotes for the same job are far apart, the gap is almost always scope, not one contractor being generous. A bid that skips a line item for excavation depth, base thickness or reinforcement is not necessarily cheaper, it is probably incomplete, and the missing scope tends to show up later as an extra charge or, worse, as a crack.

ConcreteFinder ranks listed GTA concrete businesses using a published, non-paid formula: a Bayesian-adjusted Google rating, weighted toward contractors with real review depth, plus small verification boosts for an active website, a listed phone number and real project photos. Nobody can buy a higher position. Full details are on our methodology page.

That said, our verification signals are not the same as a licence check or a legal guarantee, and Ontario does not license concrete contractors. The WSIB and insurance checks above are still yours to make directly with any contractor before you sign, listed on ConcreteFinder or not.