Window well drainage problems come down to one root cause — water pooling in the well because the perforated drain pipe at the base is missing, blocked, or not sloping toward a discharge point — and the fix is to excavate the well, install or clean the drainage line, backfill with clear stone, and cap the well with a cover.
If you see water sitting in your window well after a rainstorm, or you hear sloshing sound against the foundation wall, the drainage under the well has stopped working. Left alone, that water finds the gap between the window well and the concrete foundation, and it ends up on your basement floor. Here is how these problems actually happen in Toronto homes, and exactly what the repair involves.
What Causes Window Well Drainage Problems
Window wells in the GTA fail for four main reasons:
Missing or disconnected weeping tile. Many homes in Toronto built before the 1980s have no pipe at all under the window well — just gravel that dead-ends into clay soil. When the topsoil drains downward, the well fills up like a bathtub. On newer homes, the builder often runs the window well drain to daylight but never connects it to the footing tile, so the pipe stops 10 feet from the house and discharges into a buried pile of sand.
Clogged pipe. Leaves, bird debris, and black silt wash through the bottom of an uncovered well and pack the perforations solid. Once that happens, the stone around the pipe acts as a sponge instead of a drainage medium.
Broken or heaved pipe. Toronto's freeze-thaw cycle — mild daytime highs in January followed by overnight drops to −15°C — lifts the frost line deep enough to shift an unbedded pipe. Over a few winters, the pipe settles at a backward slope or cracks at a joint, and water simply stays in the gravel.
Failed window well seal. The vertical joint where the corrugated metal or polypropylene well meets the concrete foundation often isn't caulked at all. Water that fills the well pours straight down that joint and into the foundation crack below grade.
The Fix: What Proper Window Well Drainage Looks Like
The standard repair for a failing window well drain in Toronto homes is a straight-line re-excavation. Here is the process we use on 90% of the drainage jobs we do in the GTA:
1. Remove the window well and dig out the old backfill by hand. Most Toronto egress wells sit in a 4-foot-deep pit, and excavation takes about four hours for an average well.
2. Dig down to the footing drain and inspect the existing weeping tile or sump pit connection. On homes with a fully functional footing tile system, we tie the new line directly into it. On older Toronto homes with no footing tile, we run the new line to a buried sump pit with a small pump.
3. Install a new 4-inch perforated PVC pipe bedded in clear 3/4-inch stone. The pipe pitches at least 1/8 inch per foot toward the discharge point — zero slope means zero drainage.
4. Backfill with clear stone to 12 inches below grade, then cap with washed sand and clean topsoil. We do not put back the dense clay that came out of the hole; it does not drain and it caused the original problem.
5. Reinstall the window well, anchor it to the foundation wall, and seal the entire vertical joint with exterior-grade polyurethane caulk.
6. Test the line by filling the well with a hose and watching the pit or daylight outlet. If water does not move through within 30 seconds, we do not backfill — we find out why.
What's Included in a Professional Fix
When you hire us for a window well drainage repair in Toronto, the scope is:
- Full excavation of the window well pit
- Removal and disposal of old stone, soil, and broken pipe
- New 4-inch perforated drain pipe tied into the existing weeping tile or a dedicated sump pit
- Clear stone and sand backfill
- Reinstallation of the existing window well, re-anchored and sealed to the foundation
- Water-flow test before the job is closed up
- Optional window well cover install ($300–$900) at the same visit
We do not surface the outside of the well with decorative rocks, and we do not wrap the pipe in landscape fabric. Fabric clogs fast in Toronto clay, and it turns a drain pipe into a sealed tube within a year.
Pricing for Window Well Drainage in Toronto
Typical pricing on GTA residential window well drainage and waterproofing runs:
- Drain cleanout and flush, no excavation: $500–$900. We snake the line, camera it, and flush it with a jet nozzle. This works when the pipe is intact and simply blocked.
- Full re-excavation and new drain line: $1,800–$3,000. This covers the removal and replacement described above. The wide range comes from well depth, the distance to the sump pit, and whether the job needs a mini-excavator or hand digging due to backyard access.
- Drainage fix with new window well: add $800–$2,500 on top, depending on whether the old well can be reused or needs replacement with an OBC-compliant egress well.
- Full basement waterproofing alongside the well repair: from $1,200, covering crack injection and a clear moisture barrier on the interior side of the foundation wall.
We give you a fixed number on the free site evaluation, not an hourly estimate that grows with each frost heave.
Why Choose Egress Window Pros Toronto
We are a family-run basement contractor with 12 years of below-grade work and more than 400 egress windows and window wells installed across the GTA. Every window well we install or repair complies with Ontario Building Code 9.9.10.1 where egress is involved, and our drainage work meets the same standard: it handles water, moves it away from the foundation, and stays functional through a Toronto winter. We are licensed, insured, and WSIB covered, and all installs carry a 10-year workmanship warranty.
We also operate year-round. Freeze-thaw in Toronto does not stop excavation — it just means the drainage design has to account for frost heave. We bed our pipes deep, slope them properly, and test every line with water before we close the trench.
If water is sitting in your window well after the last rain, do not wait for it to find the gap between the well and your foundation. Call Egress Window Pros Toronto for a free site evaluation and quote within 48 hours at (416) 555-0199.