How much more does it cost to install flooring on a concrete slab versus a plywood subfloor in Vancouver?

Installing flooring over a concrete slab in Metro Vancouver typically costs $1.50 to $4.00 more per square foot compared to a plywood subfloor, driven by moisture mitigation, levelling requirements, and the additional prep work that concrete demands in our marine climate. On a 500 square foot project, that translates to $750 to $2,000 in extra costs.

The biggest cost difference comes from moisture management. Vancouver receives over 1,200 mm of annual rainfall, and concrete slabs — especially in condos, ground-level suites, and basements — can transmit significant moisture vapour even when they appear dry on the surface. Before any wood, laminate, or engineered hardwood goes down on concrete, a professional installer must perform moisture testing using either a calcium chloride test (results must be below 3 lbs per 1,000 sq ft) or a relative humidity probe test (below 75% RH). Testing itself costs $150 to $400 depending on how many test sites are needed. If moisture levels are too high, a moisture-mitigating epoxy primer ($1.50-$3.00 per square foot) must be applied before installation can proceed. On plywood subfloors, a standard 6-mil polyethylene vapour barrier at $0.15-$0.30 per square foot is usually sufficient.

Subfloor levelling is another area where concrete drives up costs. Plywood subfloors in wood-frame homes are generally close to flat and can be corrected with simple spot-sanding or patching. Concrete slabs, particularly in older Vancouver buildings from the 1960s-1980s, often have dips, ridges, and rough patches that require self-levelling compound at $2.00 to $5.00 per square foot to correct. Flooring manufacturers require subfloors to be flat within 3/16 inch over 10 feet — many concrete slabs fail this standard without preparation.

Installation method restrictions also affect cost on concrete. Solid hardwood cannot be nailed directly into concrete — it requires either a plywood sleeper system ($3.00-$5.00 per square foot to install) or must be replaced with engineered hardwood that can be glued down or floated. Glue-down installation over concrete uses full-spread adhesive ($1.00-$2.00 per square foot for adhesive alone) and requires more labour time than a simple click-lock floating installation over plywood. Floating installations work well on both surfaces, but on concrete you need a quality underlayment with an integrated vapour barrier rather than basic foam.

Here is a practical cost comparison for a 500 sq ft engineered hardwood installation in Metro Vancouver. Over plywood, expect roughly $3,500 to $7,000 total. Over concrete, the same project runs $4,500 to $9,000 once you factor in moisture testing, vapour mitigation, levelling compound, and potentially different adhesive or underlay requirements. The gap narrows with waterproof products like SPC vinyl plank, where concrete prep is simpler — but levelling and moisture barriers still add $500 to $1,500 to the project.

The key takeaway is that concrete subfloor preparation is not optional in Metro Vancouver's wet climate — cutting corners on moisture testing or levelling over concrete is the fastest path to buckled, cupped, or failed flooring. If you are planning a flooring project over concrete, Vancouver Floor Installers can connect you with contractors who specialize in concrete slab preparation for a free estimate.

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