Window Well Drainage & Waterproofing Toronto

In Toronto, window well drainage and waterproofing from Egress Window Pros Toronto costs $500–$3,000, and the final price depends on the size of the window well, how deep it sits below grade, the soil condition around your foundation, and whether we can tie the new drainage into your existing weeping tile or need to add a sump connection. A simple retrofit that clears a clogged well and installs a new gravel-and-pipe drainage bed runs on the low end; a full excavation with exterior wall waterproofing, drainage board, and regrading sits at the top of that range. Below is the breakdown we use when quoting these jobs across the GTA, so you know exactly what you're paying for.

What's Included in Window Well Drainage & Waterproofing

Window well drainage and waterproofing is not one single service. It's a package of corrections that solve one problem: water pooling in your window well and seeping through the basement window frame. When we quote a job, these are the components we price:

• Drainage bed: Removal of old gravel, mud, and debris, followed by a clean 4-inch layer of washed gravel at the base of the well.
• Drainage pipe: A perforated 4-inch PVC or corrugated pipe laid at the bottom of the well, pitched to carry water away from the foundation.
• Discharge connection: Tying the pipe into your existing foundation weeping tile, a nearby sump pit, or a positive gravity outlet. We never connect to the city sanitary sewer — that's against Toronto code.
• Waterproofing membrane: Applied to the exposed foundation wall inside the window well, usually a rubberized or self-adhering membrane that stops moisture from migrating through the concrete.
• Drainage board: A dimpled membrane that sits against the wall to direct water down to the drainage bed while protecting the waterproofing layer.
• Window sealing: Re-sealing the window frame, replacing deteriorated caulking, and adding weep holes so any water that does collect drains out instead of into the basement.
• Backfill and compaction: Clean gravel and soil placed in layers and compacted to prevent settling, with surface grade sloped away from the foundation.
• Freeze-thaw protection: Toronto winters cycle through freeze and thaw repeatedly. The drainage bed and pipe are sized and pitched to handle that, and we make sure no water can sit in the pipe and ice up.

If your window well is actively filling with water, or if you can see cracking or efflorescence on the foundation wall inside the well, the waterproofing layer is the part you don't want to skip. Skip it and the drainage pipe alone just moves the water down to the weeping tile — the wall stays wet.

Window Well Drainage & Waterproofing Pricing in Toronto

The $500–$3,000 range is honest, but only if you understand what moves you up or down the scale. Use this as a guide:

• $500–$1,200 — Basic drainage retrofit. Suitable for a standard 40″ to 48″ window well that's clogged with mud and debris. We excavate the well by hand, remove and replace the gravel, install a new drainage pipe, and reconnect it to your existing weeping tile. No waterproofing membrane. No changes to the window well itself.
• $1,200–$2,000 — Full drainage with waterproofing. For a window well where the foundation wall is wet, stained, or showing signs of water damage. Adds a rubberized waterproofing membrane to the exposed wall, drainage board, window resealing, and proper backfill and compaction. This is the most common scope for homes in Toronto with below-grade window wells.
• $2,000–$3,000 — Complex or combined work. This covers deeper window wells (more than 4 feet below grade), wells in heavy clay soil that doesn't drain naturally, or jobs where we need to extend the drainage line to reach a sump pit. It also covers jobs that combine drainage with window well replacement, rebuilding a collapsing well, or correcting major grading problems around the foundation.

The biggest cost driver in Toronto is soil. A lot of the city sits on dense clay. Clay drains slowly, and if the previous drainage line was crushed or pitched wrong, the water has nowhere to go. The second driver is access. If your window well is on a narrow side yard with no machine access, we dig by hand and that takes labour time. The third is depth. Deeper wells need more excavation, more pipe, and more backfill material, and they expose more foundation wall that needs waterproofing.

We give a free site evaluation and a fixed quote within 48 hours. We don't charge for the visit, and we don't inflate the quote because it's free. You'll know exactly which of the three tiers your job falls into before we start.

How the Process Works

Here's the step-by-step we follow on a typical window well drainage and waterproofing job:

1. Site evaluation (free). We inspect the window well, check the grade around your foundation, look at where your weeping tile ties in, and confirm whether your sump pump is active. You get a written quote within 48 hours.

2. Dig-out. We excavate the window well down to the footing level or below the window sill, whichever is deeper. For most residential wells, that means digging roughly 36–48 inches down. On clay soil, we expect it to be slow and we budget for it.

3. Drainage line install. We lay the perforated pipe with a consistent pitch of at least 1/8-inch per foot, wrap the connection to your weeping tile or sump with filter cloth to keep silt out, and test the line with water before backfilling.

4. Waterproofing. The exposed foundation wall is cleaned, any loose concrete is removed, and the membrane and drainage board go on. This is the layer that stops dampness and water migration.

5. Window seal and weep holes. We remove and re-caulk the window flange where it meets the concrete, and drill weep holes at the bottom of the window frame so condensation and any minor water entry drains to the gravel.

6. Backfill and test. We backfill in lifts, compact each layer, and finish with a surface grade that slopes away from the house at least 5% over the first 3 feet. Then we run the hose into the well for five minutes and watch the water disappear.

The whole job typically takes one to two days, depending on whether it's a two-foot dig or a four-foot hand excavation. We work year-round — freeze-thaw just tells us how deep to set the drainage bed.

Why Choose Egress Window Pros Toronto

We're a family-run Toronto basement contractor with 12 years of below-grade experience. We've installed more than 400 egress windows and window wells across the GTA, and the drainage and waterproofing side of the work has been part of every single one of them.

• Ontario Building Code compliant. Every egress window and window well we install meets OBC 9.9.10.1 exit requirements, and our drainage work is done to keep water out of the well so the egress stays functional in an emergency.
• 10-year workmanship warranty. If the drainage fails or the waterproofing lets water through within 10 years, we come back and fix it at no charge.
• Licensed, insured, and WSIB covered. You're not hiring an unmarked truck and a handshake. You're hiring a contractor with real coverage.
• Year-round availability. Toronto freeze-thaw cycles are exactly why proper drainage design matters. We design for them instead of fighting them.

We regularly work on homes in North York, Scarborough, Etobicoke, and the rest of the GTA — anywhere a window well sits below grade and collects water.

Get Your Free Site Evaluation

If your window well fills with water after every rain, or you've seen water stains around your basement window, don't wait for the next storm to decide. Call us for a free site evaluation and a fixed quote within 48 hours. You'll get a straight answer about what your window well actually needs and what it will cost. Reach Egress Window Pros Toronto at (416) 555-0199 — no call centre, no pressure, just a Toronto basement contractor who's done this 400-plus times.

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