How Much Does Basement Waterproofing Cost in Markham? (2026 Price Guide)

Pricing is one of the most confusing parts of basement waterproofing. Here's what jobs actually cost in Markham right now.

Foundation crack repair (polyurethane injection)

$400 – $900 per crack. Workmanship warranty.

Interior basement waterproofing (perimeter system)

$90 – $130 per linear foot. A typical 30-ft wall: $2,700 – $3,900. Add $1,200 – $2,000 for a new sump pit and pump.

Exterior basement waterproofing

$300 – $500 per linear foot depending on depth, access, and landscaping restoration. A typical single-wall job (25–35 ft): $9,000 – $17,000.

Sump pump installation

New primary pump: $700 – $1,400 installed. Battery backup: $1,400 – $2,200 installed.

Window well drainage repair

$500 – $1,200 per well.

Why prices vary

Excavation depth, access (front yard vs side yard), soil conditions, landscaping to restore, and existing damage all affect cost. We provide a free, written, fixed-price quote after on-site inspection — no per-hour billing surprises.

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Get a free inspection in Markham

If you've noticed dampness, cracks, or musty smells in your basement, don't wait. We offer free on-site inspections across Markham, Unionville, Cornell, Berczy Village, Cathedraltown, Markville and Thornhill — and our work is backed by a written workmanship warranty.