Leaky Basement Repair Starts With Finding the Source
Basement leak repair is about one thing: finding exactly where water gets in and fixing that spot. A wet corner, a drip from a crack, water around a pipe or a puddle at the base of one wall usually has a single source — and often does not need a full waterproofing system.
We trace the water to its entry point, explain why it leaks and repair it with the right method: crack injection, sealing a tie-rod hole or pipe penetration, fixing a window well, or a short section of drainage. If the inspection shows the problem is bigger than one leak, we tell you honestly.
Need leaky basement repair in Toronto or a basement leak repair company near me? Our crew works across Toronto and the GTA from our office in Etobicoke.
The 7 Most Common Basement Leak Sources
Water can travel along a wall before it shows up, so the puddle is not always under the leak.
The Right Repair Depends on the Source
| Leak source | How it shows up | Typical repair | Typical price |
|---|---|---|---|
| Wall crack | Drip or wet line from a crack after rain | Polyurethane or epoxy injection from inside | $500 – $1,500 per crack |
| Tie-rod holes | Small round wet spots in a grid on poured walls | Sealing the holes from inside (outside if needed) | Part of a localized repair |
| Pipe / wire penetration | Water around a water line, gas or cable entry | Sealing the penetration inside and out | Part of a localized repair |
| Window well | Water under or around a basement window | Clean drain, seal, or replace the well | $1,000 – $5,000 per well |
| Floor–wall (cove) joint | Water spreading from the base of a wall | Interior drainage along that wall | $50 – $120 per linear foot |
| Floor drain backup | Water or sewage coming up through the drain | Drain camera check, backwater valve | $2,000 – $4,200 per valve |
| Floor crack | Water rising through a floor crack | Seal and relieve pressure under the slab | Part of a localized repair |
Localized leak repairs usually cost $600 – $2,500. Approximate 2026 Toronto prices; exact price after a free inspection.
How We Find Where Your Basement Is Leaking
Your history
When does it leak — heavy rain, snowmelt, laundry day? Which spot gets wet first?
Inside inspection
Cracks, tie-rod holes, penetrations, the cove joint, stains and efflorescence.
Moisture readings
A moisture meter shows where the wall is wettest — often not where the puddle is.
Outside check
Grading, downspouts, window wells and anything draining toward that wall.
Drains & plumbing
Floor drain, sump pit and plumbing lines, so we do not blame the foundation for a pipe.
Leak or condensation?
Condensation on cold walls in summer looks like a leak but needs a different fix.
Written repair plan
The source, the repair, the price and the warranty — in writing.
Repairing Basement Leaks From Inside vs Outside
| Repair from inside | Repair from outside | |
|---|---|---|
| Good for | Cracks, tie-rod holes, small penetrations, one leaking wall | Leaks you cannot reach inside, failing wall section, window wells |
| How | Injection, sealing, short interior drain | Spot excavation at the leak, membrane, drainage |
| Disruption | Inside work area only | Digging at one spot outside |
| Finished basement | Small opening in drywall at the leak | Finishes inside usually stay untouched |
| Typical price | From about $500 | Priced per linear foot dug ($100 – $250) |
A spot repair is usually enough when…
- The leak comes from one crack, hole or pipe
- The rest of the basement is dry
- It leaks only in heavy rain at one place
- The walls are otherwise in good shape
A full system is better when…
- Water appears along many walls
- The cove joint leaks around the basement
- The weeping tile has failed
- The basement keeps getting wet despite repairs
For widespread dampness see wet basement repair; for full systems see interior or exterior waterproofing.
Why Some Basement Leak Repairs Don’t Last
Paint and caulk
Waterproofing paint and caulk hide the leak but do not stop water under pressure.
Hydraulic cement patch
A rigid patch on a moving crack cracks again; injection fills the crack through the wall.
Wrong source
Fixing a crack when the water comes from a window well or a pipe moves nothing.
Dehumidifier only
It dries the air, not the wall. The leak keeps coming.
Ignoring the outside
Downspouts and grading that send water to the wall keep feeding the leak.
One leak of many
If the cove joint leaks everywhere, sealing one spot only moves the water.
Real Leaquida job siteWhat to Document Before the Inspection
- Photos of the wet area while it is leaking
- Where it got wet first — not just where the water ended up
- Dates: rain, snowmelt, laundry or a long shower
- Any earlier repairs and what was done
- Whether the water was clean or smelled like sewage
If water is rising quickly, smells of sewage, or is near outlets or the electrical panel, keep out of it and see emergency waterproofing.
When a Leak Is Part of a Bigger Problem
Targeted Leak Repair vs Full Waterproofing
| Situation | Targeted repair | Full waterproofing |
|---|---|---|
| One crack leaks | Yes — injection | Not needed |
| Leaks at a pipe or wire entry | Yes — seal the penetration | Not needed |
| Several leaks along one wall | Sometimes | Often better value |
| Water along the floor-wall joint all around | No | Interior drainage system |
| Walls soaked through, old block or stone | No | Exterior or interior system |
| Water through floor drains | No — backwater valve | Not the right fix |
Why Basement Leak Repairs Fail
Wrong source
Sealing a crack does nothing if water is coming in at the joint below it.
Surface patches
Hydraulic cement and caulk on the inside crack again as the wall moves.
Water pressure ignored
Without drainage, water keeps pushing and finds the next weak spot.
Outside causes left alone
Downspouts and grading that send water to the wall keep loading it.
What to Note Before Your Leak Assessment
A few details help us find a leak faster.
When it leaks
After rain, after snowmelt, or all the time?
Where water appears
Photos of the spot when it is wet are very helpful.
What is outside
Downspouts, gardens, walkways or a neighbour’s driveway near that wall.
History
Past repairs, flooding or work done on the house.
Basement Leak Repair Questions
How much does basement leak repair cost?
Most localized basement leak repairs cost $600–$2,500. A single crack injection is $500–$1,500. If the leak is part of a wider drainage problem, interior drainage is $50–$120 per linear foot. The inspection and written quote are free.
Can one leak be fixed without waterproofing the whole basement?
Yes, when the water comes from one crack, hole, pipe or window well and the rest of the basement is dry. We repair only that spot.
How do you find where a basement leak is coming from?
We look for the first wet spot, take moisture readings, check cracks, tie-rod holes, penetrations, the cove joint, drains and plumbing, and check the outside grading and window wells.
Why does my basement only leak after heavy rain?
Rain saturates the soil and raises water pressure against the wall, pushing water through the weakest point — a crack, hole or joint. Downspouts emptying next to the wall make it worse.
Can you repair basement leaks from inside?
Most cracks, tie-rod holes and penetrations can be repaired from inside by injection and sealing. Some leaks need a small excavation outside at that spot.
When do you repair a basement wall leak from outside?
When the leak cannot be reached inside, the wall section is deteriorated, or a window well or penetration needs work outside. We dig only at the leak.
Is water at the base of the wall always a crack?
No. It is often the floor–wall joint, a window well above, a pipe penetration, or water running down the wall from higher up.
Will a sump pump stop my leak?
A sump pump removes water that reaches it; it does not seal a crack or a hole. It helps when the problem is groundwater under the floor.
Do you offer emergency basement leak repair?
We prioritize active leaks during business hours (Mon–Fri 7 AM – 4 PM). See our emergency waterproofing page for what to do right away.
Is the repair guaranteed?
Yes. Every leak repair comes with a written warranty on materials and workmanship.
How long does basement leak repair take?
Many targeted repairs, such as crack injection or sealing a pipe entry, are done in a day. Larger repairs take two to five days.
Can I fix a leaking basement myself?
You can extend downspouts and fix grading. Sealing cracks from inside with patches rarely lasts, because the wall keeps moving and water keeps pushing.
Can a leaking basement damage the foundation?
Over time, yes. Water washes out soil, freezes in cracks and corrodes reinforcing steel. Fixing the leak early protects the structure.
Get Your Basement Leak Fixed
Tell us where the water shows up. We will find the source, explain the repair and give you a written price — no pressure, no obligation.
Call now — Mon–Fri 7 AM – 4 PM(416) 992-5858Office: 58 Six Point Rd, Etobicoke, ON M8Z 2X2
Email: info@leaquida.ca
Licence No.: P94 4418977 (licensed contractor)