What is the price to install a plywood subfloor over concrete in a Calgary basement?

Installing a plywood subfloor over concrete in a Calgary basement typically costs $5 to $9 per square foot fully installed, which works out to $3,000 to $7,200 for a typical 600 to 800 square foot basement. This includes pressure-treated sleepers, vapour barrier, insulation (optional but recommended), 3/4-inch plywood sheathing, and professional labour.

Here is how the costs break down. Pressure-treated 2x4 sleepers laid flat on the slab run about $0.50 to $1.00 per square foot in material. A 6-mil polyethylene vapour barrier between the slab and the sleeper assembly costs $0.10 to $0.20 per square foot. Rigid foam insulation between the sleepers (1.5-inch XPS or EPS) adds $1.00 to $2.00 per square foot and is highly recommended in Calgary — without it, the basement floor will be noticeably cold from October through April despite the plywood layer. The 3/4-inch tongue-and-groove plywood sheathing runs $1.50 to $2.50 per square foot. Fasteners, adhesive, shims, and miscellaneous materials add another $0.30 to $0.50 per square foot. So total material cost is roughly $3.50 to $6.00 per square foot.

Professional labour for a plywood-over-concrete subfloor installation in Calgary runs about $2.00 to $4.00 per square foot, depending on the basement complexity (obstructions, posts, irregular shapes, plumbing penetrations). The work includes levelling the sleepers with shims to create a flat surface, cutting and fitting the plywood with proper expansion gaps, and securing everything. A professional crew can typically complete a 600 to 800 square foot basement in one to two days.

Additional costs that often apply: If the concrete slab has significant cracks or unevenness, it may need patching or grinding before the sleepers go down ($1 to $3 per square foot for affected areas). If the slab has elevated moisture levels — test first with a calcium chloride kit or RH probe — you may need a more robust moisture mitigation system than basic poly sheeting. Disposal of any existing basement flooring that needs to be removed first adds $1 to $3 per square foot for tearout and a bin rental ($300 to $600 in Calgary).

Compare this to Dricore panels at roughly $4.50 to $7.00 per square foot installed. Dricore is faster to install, provides a built-in moisture management air gap, and is sufficient for floating floors like LVP, laminate, and floating engineered hardwood. The traditional plywood-over-sleeper approach makes more sense if you want the option of nail-down engineered hardwood, if you want to add insulation between sleepers for maximum warmth, or if the slab is severely uneven and the sleeper system allows you to level the new subfloor while compensating for the slab's irregularities.

One important note: a plywood subfloor over concrete raises the floor height by approximately 1.5 to 2 inches (sleepers plus plywood), plus the thickness of your finished flooring on top. In Calgary basements with standard 7-foot ceilings, this height loss can feel significant. Verify your basement ceiling height before committing to this approach — the Alberta Building Code requires a minimum clear ceiling height for habitable rooms, and losing 2 inches plus flooring thickness could be a factor. Get matched with a flooring professional through Calgary Floor Installers who can assess your basement and recommend the most cost-effective subfloor approach for your situation.

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

• One OAK Flooring
• Royland Stucco
• The Original Workshop
• WestAim Construction Ltd.
• True North Overhead Doors