Waterproof Your Basement Before Finishing It — Here's Why

Every month, we get at least one heartbreaking call from a homeowner whose brand-new finished basement just flooded. Drywall, hardwood, custom built-ins — destroyed. Insurance often doesn't cover it.

The right order

1. Identify any existing or potential water entry points. 2. Waterproof properly (interior, exterior, or both). 3. THEN finish the basement.

Why this matters in Markham (and Mississauga, and across the GTA)

Older neighbourhoods have aging foundations. Newer subdivisions have settling that creates fresh cracks 5–10 years in. Either way, finishing without waterproofing is gambling with $30,000+ of work.

What "waterproofing first" looks like

Free inspection. Address any visible cracks. If history of dampness, install interior or exterior system as appropriate. Add or upgrade sump pump and backup. Then let your finisher take over.

Cost-of-doing-nothing math

Average finished basement value destroyed by a single major leak: $25,000–$60,000. Average waterproofing job before finishing: $3,000–$12,000. The math is obvious.

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.