How Much Does Basement Waterproofing Cost in Newmarket?

Quick answer: most Newmarket basement waterproofing projects fall between $400 and $25,000. The huge range comes down to which problem you actually have. The single most important thing is matching the fix to the actual issue - because the cheapest path that actually solves your basement problem is what you should pay, not whatever the salesperson quotes first.

Below are real prices for the work we and other reputable Newmarket basement waterproofing contractors charge in 2026. If a quote you've received is significantly outside these ranges, get a second opinion.

Foundation crack repair: $400 - $1,800

For a single non-structural crack in a poured concrete foundation, expect $400 - $900 for polyurethane injection. Adds about 1 hour of work. If your crack is structural and needs epoxy plus reinforcement (less common), $900 - $1,800.

Multiple cracks usually get bundled - $400 for the first, $250-$300 for each additional crack on the same visit. If you have 5+ cracks an interior weeping tile system often becomes more economical.

Window well repair or installation: $400 - $2,800

Drain repair on an existing well (the most common job): $400 - $900. New galvanized or polymer well install with proper drainage: $1,200 - $2,800 depending on size and depth. Add $150-$300 for a polycarbonate cover.

Sump pump installation: $600 - $4,500

Replacing the pump in an existing pit: $600 - $1,200 (cast iron primary). Adding a battery backup pump alongside: $700 - $1,200 (worth it). Wi-Fi water alarm: $200-$300. Installing a brand-new sump pit and pump where none existed: $2,500 - $4,500.

Brands matter. A Liberty, Zoeller, or Wayne cast-iron pump will outlast a $200 plastic pump from the box store by 5-10 years. Pay the extra $300 for the better pump.

Interior waterproofing system: $7,000 - $15,000

Full perimeter interior weeping tile + sump pit + primary pump for a typical Newmarket bungalow (140 linear feet): $9,000 - $11,000. Larger two-story (200 linear feet): $12,000 - $15,000. Add $1,000-$1,800 for battery backup.

Smaller jobs (single wall only) scale down: $4,500 - $7,000 for one wall. Some companies will only quote you a full-perimeter system - get a second quote if you've been told one wall isn't possible.

Exterior waterproofing: $15,000 - $30,000+

Full perimeter exterior membrane + new weeping tile + backfill on a typical Newmarket two-story: $20,000 - $28,000. Single-wall exterior (when only one side is the problem): $7,000 - $12,000. Heritage stone foundations needing parging plus membrane: 25-40% more than the same dimensions on poured concrete.

Excavation cost dominates this number. Tight access (close to a neighbour, deck or driveway in the way) increases price. Easy access (open backyard, no decks) decreases it.

Crawl space encapsulation: $4,000 - $9,000

For homes with crawl spaces rather than full basements. Plastic vapour barrier + sump + dehumidifier + sealing. Less common in Newmarket than in older parts of Toronto but still relevant for some pre-war homes.

What affects your quote up or down

• Foundation type (poured concrete easiest, block stair-step harder, stone hardest)
• Access (open yard easy, fenced yard with deck adds 10-20%)
• Excavation depth (basements 6-9 feet deep, deeper = more cost)
• Soil conditions (Newmarket's clay can require more careful trenching)
• Permit requirements (rare for interior, sometimes required for exterior)
• Battery backup, Wi-Fi alarms, premium pump brands (worth it)
• Time of year (winter excavation is harder, often quoted higher)
• Whether the basement is finished (drywall removal and replacement adds cost)

How to compare quotes fairly

1. Get at least 2 quotes for any job over $3,000
2. Make sure each quote specifies the exact scope (linear footage, materials, brands, warranty terms)
3. Compare warranty terms - lifetime workmanship is the standard, anything less is a red flag
4. Ask whether the company subcontracts or uses in-house crews
5. Confirm the discharge plan complies with Newmarket bylaws (no sanitary sewer discharge)
6. Don't pay more than 25% upfront. Final payment after the work passes inspection.

Free inspection, real numbers

We provide written quotes after a 30-45 minute on-site inspection. No pressure, no obligation. If we don't think you need work, we'll tell you that and you keep your money.