Basement waterproofing near you
Interior and exterior basement waterproofing, crack repair and drainage across the GTA. What actually causes a wet basement here.
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Kinds of waterproofing
The waterproofing jobs people book most. Open one to see what it covers and what it costs.
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One post, the whole situation handled
Several jobs bought as one outcome — one Tasker, one price to agree, no coordinating three trades yourself.
The cheap half, first
Eavestroughs cleared, downspouts extended well away from the wall, window wells drained and the grade checked — the outside causes ruled out before anyone prices excavation.
Post this taskBefore the basement is finished
Waterproofing and drainage completed and tested before framing goes in, so the finish is not built over a problem that is still there.
Post this taskAfter the water
The wet material removed and disposed of, the space dried properly, and the cause fixed — in that order, so the repair is not done around damp drywall.
Post this taskSump with a backup
A sump pump fitted or replaced with a battery backup, because the storms that flood a GTA basement are the same storms that take the hydro out.
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The wardrobe, the desk and the bed frame built and levelled, with the cardboard taken away.
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The list on the fridge
The shelf that never went up, the door that sticks, the light that flickers — one visit instead of three.
Post this taskWhat waterproofing actually costs here, and why
A wet basement in the GTA almost always has a cheap cause and an expensive one, and the order you investigate them in decides what you spend. The cheap causes are outside and above ground: blocked eavestroughs, a downspout discharging beside the wall, grade that falls toward the house rather than away, a window well with no drainage. The expensive causes are below ground: a cracked foundation wall, failed or absent exterior membrane, a blocked weeping tile. Anyone who quotes the expensive fix without ruling out the cheap ones has skipped the diagnosis.
Interior and exterior waterproofing solve different problems and are often presented as alternatives. An interior system — a drainage channel cut around the inside perimeter of the slab, feeding a sump — does not stop water entering the wall; it manages water that has already entered and gets it out before it reaches the floor. Exterior waterproofing excavates to the footing, cleans the wall, applies a membrane and usually replaces the weeping tile, which stops water reaching the wall in the first place. Exterior costs considerably more and disturbs the yard; interior is less invasive and does not dry the wall itself.
Toronto's housing stock explains a lot of what people find. A great deal of it predates modern foundation waterproofing entirely, and older poured or block walls in the east end, the Junction and the Beaches often have original weeping tile that is clay, collapsed, or long since silted up. Many houses also still have downspouts tied straight into the sewer, which the city has been pushing to disconnect — and a disconnected downspout that now discharges beside the wall has quietly converted a sewer problem into a foundation one.
Cracks are not all the same and the distinction matters. A hairline vertical crack in a poured wall is usually shrinkage and is injectable from inside with polyurethane or epoxy for relatively little. A horizontal crack, a stair-step crack in block, or one that is wider at one end is a structural signal and needs an engineer's opinion before anyone injects anything — sealing a moving crack simply moves the water to the next weakness. Photograph what you have and describe it accurately when you post; it changes who should be quoting.
Spring is when the GTA finds out. Frozen ground thaws, meltwater has nowhere to go, and the water table comes up — which is why the calls cluster in March and April and why the good crews are booked through them. If your basement took water this spring, the work is easier and cheaper to arrange in late summer or autumn when the ground is dry and the schedule is open, and it will be finished before the next thaw.
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Local knowledge
Priced for how the GTA actually lives
Four things that change a waterproofing quote here, and nowhere else.
Disconnected downspouts
The city fixed one problem and created another
Much of Toronto's older stock had downspouts plumbed into the sewer, and disconnection has been pushed for years. A downspout now discharging beside the wall has moved a sewer problem to the foundation.
Clay weeping tile
Older houses have drainage that has already failed
Original weeping tile in the pre-war neighbourhoods is frequently clay, collapsed or silted solid. Exterior work here is usually replacing drainage that stopped working decades ago, not adding something new.
March and April
The thaw is when the GTA finds out
Frozen ground, meltwater with nowhere to go and a rising water table put the calls into a six-week window every spring. Booking the work for late summer is cheaper, easier to schedule, and done before the next one.
Crack shape
Horizontal is a different conversation
A hairline vertical crack is usually shrinkage and injectable. A horizontal or stair-step crack is a structural signal, and sealing a moving crack only moves the water to the next weak point.
What an interior system usually covers
- Breaking out the slab around the inside perimeter
- Laying new drainage pipe in stone, falling to a sump
- A sump pit and pump discharging well away from the house
- A membrane up the wall to direct seepage into the channel
- The slab restored over the channel
Exterior work is a different job entirely — excavation, wall preparation, membrane and weeping tile replacement — and is priced per wall.
Try nowWhat moves the price
- Interior drainage versus exterior excavation and membrane
- Linear footage of wall being treated, not floor area
- Depth to the footing, and access for a machine to reach it
- What is against the wall outside — a deck, a driveway, mature planting
- Foundation type: poured concrete, block or rubble each behave differently
- Whether a sump and pump already exist and can be reused
- Whether an engineer's opinion is needed before anything is sealed
Worth asking before you agree
- Have the eavestroughs, downspouts, grade and window wells been ruled out?
- Does this stop water reaching the wall, or manage it once it is in?
- What is the warranty, what does it cover, and is it transferable?
- Is the discharge going far enough from the house to not come back?
- For a crack: is this shrinkage or structural, and how do you know?
- What is the plan if excavation exposes something unexpected?
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Questions
Frequently asked
GTA-specific answers to what people actually search for.
How much does basement waterproofing cost in Toronto?
We show no band here, deliberately. Our engine prices cleaning, moving, junk removal, lawn care, plumbing and electrical work, and waterproofing is not one of them — a typed range would be authoritative-looking and derived from nothing. Post the job and compare real fixed-price offers instead.
Interior or exterior — which one do I need?
They do different things. Exterior stops water reaching the wall: excavate to the footing, clean and membrane the wall, replace the weeping tile. Interior manages water that is already in the wall and drains it to a sump before it reaches the floor. Exterior costs more and disturbs the yard; interior is less invasive and leaves the wall wet.
My basement only leaks in spring — is that still a problem?
Usually yes, because the cause has not gone away, it is just not being tested. The thaw combines saturated ground with a rising water table, which is why the GTA gets a cluster of calls every March. Investigating in late summer with dry ground is easier, cheaper to schedule, and gets it fixed before the next one.
Should I try the cheap fixes first?
Yes, and it is what an honest contractor will suggest. Blocked eavestroughs, a downspout discharging beside the wall, ground sloping toward the house and a window well with no drainage cause a large share of wet basements in this city, and they cost a fraction of anything below grade. A quote for excavation that has not ruled them out has skipped the diagnosis.
Is a crack in my foundation serious?
It depends on its shape. A hairline vertical crack in a poured wall is usually shrinkage and can be injected from inside. A horizontal crack, a stair-step crack through block, or one noticeably wider at one end suggests movement and warrants an engineer before anything is sealed — injecting a moving crack just relocates the water.
Does a sump pump need a backup?
In the GTA it is worth it. The storms that overwhelm a basement are frequently the same storms that take the power out, and a sump with no pump is a hole that fills. A battery backup or a water-powered secondary is a small cost against the thing it exists to prevent.
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