How much does a concrete garage floor cost per square foot in Ottawa?

The cost of a concrete garage floor in Ottawa depends on whether you are pouring a brand-new slab, replacing an existing deteriorated one, or resurfacing and coating what you already have. Each scenario has a different price range, and understanding the breakdown helps you make the right decision for your situation and budget.

For a new concrete slab poured on a prepared base, most Ottawa concrete contractors charge between $8 and $14 per square foot for a standard four-inch-thick floor with a broom or trowel finish. That puts a single-car garage floor of roughly 200 square feet at $1,600 to $2,800, and a double-car garage of about 400 square feet at $3,200 to $5,600. These prices include the gravel sub-base preparation, vapour barrier, wire mesh or rebar reinforcement, concrete supply and delivery, pouring, finishing, and control joint cutting.

If you are replacing an existing floor that has cracked, heaved, or deteriorated beyond repair, the cost is higher because you need to demolish and remove the old slab first. Demolition and removal adds $3 to $5 per square foot, bringing your total to $11 to $19 per square foot for a complete tear-out and replacement. For a double-car garage, that works out to roughly $4,400 to $7,600 all in.

Upgrading to a six-inch-thick slab, which is advisable if you plan to park heavier vehicles, install a car lift, or use the garage as a serious workshop, adds about $2 to $3 per square foot over the standard four-inch thickness. The extra concrete and reinforcement cost is modest relative to the significant improvement in load-bearing capacity and crack resistance.

Finishing Options and Their Costs

The base price gets you a functional but plain concrete surface. Many Ottawa homeowners choose to upgrade the finish for both aesthetics and durability, and the options range from very affordable to premium.

A sealed concrete finish, where a penetrating silane or siloxane sealer is applied to the cured slab, adds just $1.50 to $2.50 per square foot and provides excellent protection against road salt, moisture penetration, and staining. This is the minimum recommended treatment for any Ottawa garage floor given the amount of salt and calcium chloride our vehicles track in during winter months.

Epoxy floor coating is the most popular upgrade and runs $5 to $9 per square foot for a professional two-coat application with decorative colour flakes and a clear topcoat. For a double-car garage, that translates to $2,000 to $3,600 on top of the bare slab cost. Professional epoxy done properly lasts eight to fifteen years before needing a refresh and makes the floor dramatically easier to clean. DIY epoxy kits from hardware stores cost a fraction of this but have a well-deserved reputation for peeling within a year or two in Ottawa's freeze-thaw climate because the surface prep is rarely adequate.

Polyaspartic coatings are a newer alternative that costs $7 to $12 per square foot installed but cures in a single day versus the three to five days required for epoxy, and they handle temperature extremes and UV exposure better. For homeowners who cannot have their garage out of commission for multiple days, the faster turnaround justifies the premium.

Stamped or stained concrete, which creates a decorative coloured and textured surface, runs $10 to $16 per square foot and is more common in garages that double as entertainment or living space. Polished concrete, which involves mechanically grinding the surface to a glossy finish, costs $6 to $10 per square foot and creates a sleek, modern look that is extremely durable.

Ottawa's freeze-thaw cycles put more stress on garage floors than most Canadian cities because we see so many temperature swings across the zero-degree mark between November and April. Air-entrained concrete, proper sub-base drainage, and a quality sealer or coating are not optional luxuries here, they are essential for a floor that will last. If you want help figuring out the right floor system for your garage, Garage IQ can walk you through the options that make the most sense for Ottawa conditions.

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Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

• 613Bins
• RenoMotion Inc.
• JMY Renovations
• Leeds Property Maintenance
• Epoxy Academy