Wet Basement Repair Cost in BC

Average cost

Wet basement repair in the Lower Mainland ranges widely: $500–$3,000 for grading, downspout or crack fixes, $5,000–$15,000 for interior drainage and sump systems, and $15,000–$40,000 where exterior drain tile and waterproofing are needed.

Cost per linear foot

Interior drainage systems generally run $60–$120 per linear foot; exterior waterproofing with new drain tile $120–$250 per linear foot.

Excavation costs

Interior fixes avoid outside digging but require cutting the slab along the wall. Exterior fixes need excavation to footing depth, which is the biggest cost driver.

Landscaping restoration

Exterior repairs can add $2,000–$10,000 in restoration; interior repairs need flooring and drywall restoration instead.

Accessibility

Finished basements add demolition and rebuild costs inside. Tight lot lines add cost outside.

Depth

Deeper full-height basements cost more to waterproof from outside than partial basements or crawl spaces.

Permits

Most Lower Mainland municipalities (Vancouver, Burnaby, Surrey, Richmond and others) require a plumbing permit for perimeter drain replacement and any new storm connection. Permit and inspection fees typically add a few hundred dollars. Your contractor should pull the permit and hand you the final inspection sign-off.

Repair approach

Surface fixes (grading, downspouts), crack injection, interior perimeter drain with sump, or exterior membrane with new drain tile. The right approach depends on where water is getting in.

Targeted fix vs full system

Start with the cheapest likely cause — downspouts and grading. If water persists, a camera inspection of the drain tile tells you whether a full system is justified.

Vancouver vs Fraser Valley considerations

Vancouver, Burnaby and New Westminster jobs tend to cost more: tight lot lines, shared side yards, mature trees, hand digging and higher disposal and parking costs. Fraser Valley jobs (Langley, Abbotsford, Chilliwack, Maple Ridge) usually have better machine access and lower disposal costs, but larger homes, longer runs and heavier clay can offset the savings. Low-lying Richmond and Delta often add dewatering and sump work.

Questions to ask contractors

1. Where exactly do you believe the water is coming in?
2. Have you ruled out grading and downspout problems?
3. Is this an interior or exterior solution, and why?
4. What does the price include for restoring finishes?
5. What warranty covers future leaks?

When wet basement repair is actually necessary

A full system is justified when water enters along multiple walls, persists after surface fixes, or a camera confirms failed drain tile.

Learn more about wet basement repair in the Lower Mainland.