How much does a concrete slab or garage pad cost?

There's no flat per-foot number that holds, because the slab is the cheap part and the job around it is the cost. A small shed pad on flat, well-drained ground is the affordable end. A garage floor that has to carry a vehicle, sit level, and not heave through a Southern Ontario winter is a different job with a deeper base and more reinforcement. The finish, the base, the steel, and the access all move the price. A free site visit and a written quote is the honest way to get a real number.

Can I pour a concrete slab myself?

A small shed or step pad on good, flat ground is doable for a confident DIYer: dig out, compact a granular base, set forms, pour, screed, and finish. The trouble is that the base prep and the finishing are the parts that decide whether it lasts, and both are easy to get wrong. A garage floor, anything carrying a vehicle, anything structural, or a large pour where the concrete sets before you can finish it is work to hire out. The concrete you save on is the cheap part. The mistakes are not.

Do I need rebar or wire mesh in a concrete slab?

It depends on the load. Wire mesh helps hold a light-duty slab together and keeps cracks tight, and it's common for shed pads and patios. Rebar is the heavier reinforcement, laid in a grid for slabs that carry real weight like a garage floor, a driveway apron, or anything a vehicle parks on. The right answer is set by what the slab has to carry, not by a rule of thumb. Under-reinforcing a load-bearing slab is one of the most expensive corners to cut, because the fix is a new slab.

Do I need a permit for a garage pad in Ontario?

It varies by municipality and by what the slab is for. A standalone slab at grade may not need a permit, but the moment it's the floor of a garage or any structure, you're usually into building-permit territory with setbacks and inspections. The rules differ from one town to the next across Southern Ontario, so we check the local requirements before we pour and your municipal building department is the place to confirm. Don't carry an assumption from one municipality to another.

How thick should a garage pad be?

A garage floor that carries a passenger vehicle is commonly poured at a 4 inch slab over a compacted granular base, with reinforcement sized to the load. Something carrying heavier equipment goes thicker. Thickness is only half the story though, because a thick slab on a poorly compacted base still cracks and settles. The base under it and the steel in it matter as much as the inches. That's a judgment made at the site, which is why a written quote beats a number off a web page.

Concrete Slab and Garage Pad Cost in Ontario

A garage pad is one of the most price-checked pours there is, so the web is full of confident per-foot numbers. Here’s the thing those numbers hide: the concrete itself is the cheap part of the job. What you’re really paying for is the base under the slab, the steel in it, the crew that gets it level, and someone standing behind it if it ever moves. Understand where that money goes and you can read a quote properly instead of chasing the lowest number into a cracked floor.

The concrete is the cheap part

Order a few cubic metres of concrete and the material cost is modest. That’s why a flat per-foot rate is so tempting and so misleading: it quietly assumes the expensive work around the pour is the same on every job, and it never is. The mix gets poured into whatever you’ve prepared for it. A bad base or a thin layer of steel doesn’t show up the day the truck leaves. It shows up two winters later as a crack you can put a coin into. So when one quote is well under the others, the gap almost always comes out of the parts you can’t see: the base and the reinforcement.

Where the money actually goes

Four things carry the real cost of a slab, and none of them is the concrete:

The base. Excavating to stable ground and compacting a proper granular base in lifts is the foundation the whole slab depends on. Rush it and the slab settles and cracks no matter how good the concrete was. This is real labour and real material, done before a drop of concrete arrives.
The reinforcement. Wire mesh for light-duty slabs, rebar in a grid for anything that carries weight. The steel is what holds the slab together when the ground moves underneath it, and Southern Ontario ground moves every freeze-thaw.
The crew and the finish. Concrete sets on its own clock. A slab has to be poured, screeded level, and finished before it goes off, which is why a large pour is a crew job, not a one-person one. A floor that drains right and sits flat is finishing work, not luck.
The accountability. A written quote that itemizes the job, and a crew that stands behind it, is part of what you’re paying for. The cheapest cash number with nothing on paper is cheap because that part is missing.

The honest DIY-versus-pro read

Not every slab needs a crew, and we’ll say so plainly.

A small shed pad or a step landing on flat, well-drained ground is a reasonable DIY job if you’re handy. Dig it out, compact a granular base, set your forms, and pour something small enough that you can screed and finish it before it sets. People do this well every summer.

Where DIY turns expensive is the load-bearing and the large pours. A garage floor that carries a vehicle, anything structural, anything tied to a building, or a slab big enough that the concrete starts setting before you can finish it: that’s work to hire out. The two parts most likely to go wrong for a first-timer are the base prep and the finishing, and those are exactly the two parts that decide whether the slab lasts. You don’t save money doing the cheap part yourself if the result is a slab you have to tear out and repour. When in doubt, the bigger and the more weight it carries, the more it belongs with a crew.

Mesh or rebar, set by the load

The reinforcement question is really a load question. Wire mesh helps a light-duty slab hold together and keeps shrinkage cracks tight: it suits shed pads, walkways, and patios. Rebar is the heavier answer, laid in a grid for slabs that carry real weight, a garage floor a vehicle parks on, a thickened edge, a driveway apron. Putting mesh where the load called for rebar is one of the most expensive corners anyone cuts, because there’s no patch for it. The slab cracks under the weight and the fix is a new slab. The right call comes from what the pad has to carry, which is a judgment made at the site.

The permit reality

Whether a slab needs a permit depends on your municipality and on what the slab is for. A standalone pad at grade often doesn’t, while the floor of a garage or any structure usually does, with setbacks and inspections attached. Those rules are not uniform across Southern Ontario, so the only safe move is to check the local requirements before pouring rather than assume the rule from the next town over. We confirm it as part of the job, and your municipal building department is the authority.

How to read a slab quote so the cheap one doesn’t cost you more

A fair quote is itemized. It names the base depth and compaction, the reinforcement and why that steel suits the load, the slab thickness, the mix (look for 32 MPa air-entrained concrete, the standard for Ontario’s freeze-thaw and road salt), the control joints, and the tear-out if an old slab has to come out first. A quote that’s just one low number, or that leaves the base and the steel vague, is the expensive option in disguise. The savings come out of the parts that keep the slab flat and whole, and you pay the difference back in cracking and settling.

The honest way to get a real number for your slab or garage pad is a free site visit and a written quote that holds. That’s how we do it, and it means you’re comparing the whole job, base and steel and finish, instead of guessing against a rate that was only ever about the cheap part.