- Installing a sump pump in an existing basement means cutting the slab, setting a sealed pit where water collects, tying in the weeping tile and running the discharge outside, well away from the foundation.
- A new pit and pump typically runs $1,500 to $3,500 in the Hamilton area. Replacing a pump in an existing pit is $500 to $1,400.
- In Burlington, Oakville and Milton, Halton covers 100% of disconnecting your weeping tile and installing a new sump pump, up to $6,500, but only reimburses labour when a contractor does the work.
- The Ontario Building Code sets a minimum pit size and requires a child-resistant, airtight cover, and foundation drains can't be connected to the sanitary sewer.
Do you actually need a sump pump?
Not every basement needs one. A sump pump earns its keep when groundwater collects around or under the floor and has nowhere better to go. It's also the standard fix when your weeping tile is connected to the sanitary sewer and needs to come off it, which is exactly what Halton Region pays homeowners to do.
- Water seeps in at the floor-wall joint after heavy rain or during the spring thaw.
- The weeping tile drains to the sanitary sewer, or has no working outlet at all.
- The floor stays damp or water comes up through the slab in wet seasons.
- You're finishing the basement and want protection before the drywall goes up.
- You're adding an interior drainage system, which needs a sump to empty into.
If water is coming through one leaking crack, or the ground outside slopes toward the house, a sump treats the symptom rather than the cause. Fix the cause first. Our guide to cracks in a basement wall covers the most common one.
How a sump pump is installed, step by step
Replacing a pump in an existing pit is a small job. Installing a sump pump where there's never been one is real construction. Here's what a proper install involves.
- 01
Pick the spot
The pit goes where water actually collects and where the weeping tile can be reached, with a practical route for the discharge to get outside. A pit in the wrong corner can sit dry while the other side of the basement takes on water.
- 02
Cut and dig
A section of the concrete floor is saw-cut and broken out, and the hole is dug below the slab deep enough for the basin.
- 03
Set the basin
A sealed sump basin goes in on a stable base with clean stone around it so water can reach it freely. The Building Code calls for a pit at least 750 mm deep and 0.25 m² in area.
- 04
Tie in the drainage
The weeping tile, or a new interior drain, is connected to the basin so groundwater flows to the pit instead of pushing up through the floor or into the sanitary sewer.
- 05
Install the pump and check valve
The pump sits in the basin with its float switch, and a check valve on the discharge stops water running back into the pit every time the pump shuts off.
- 06
Run the discharge
The discharge line goes through the wall and out to a spot where water drains away overland, well clear of the foundation, your walkways and your neighbours.
- 07
Power, cover and patch
The pump needs a reliable outlet, ideally on its own circuit. The pit gets a child-resistant, airtight cover, and the floor is patched around it.
What the Ontario Building Code says about sump pits
The 2024 Ontario Building Code includes specific rules for sump pits. Where a pit is provided, it has to be at least 750 mm deep and at least 0.25 m² in area, with a cover that resists removal by children and is airtight. Where foundation drainage can't drain by gravity, it has to go to an automatic sump pump that discharges to a sewer, a drainage ditch or a dry well. A dry well has to be at least 5 m from the foundation.
Local rules keep foundation drain water out of the sanitary sewer. In Hamilton, the City's Sewer Use By-law prohibits sending stormwater, land drainage or groundwater into the sanitary or combined sewer, except for properties connected to a combined sewer or holding a City discharge permit.
For a new pit, the Code calls for a child-resistant, airtight cover. An open pit or a loose lid is worth fixing either way.
Where the water goes
A sump only works if the water it pumps out doesn't come straight back. Halton's guidance is that a sump pump should discharge outside and overland, away from the foundation. The University of Waterloo's Intact Centre recommends extending sump discharge pipes at least 2 m from the foundation.
Downspouts follow the same logic. Halton suggests discharging them about 3 m from the house, and CMHC suggests downspouts discharge at least 1.8 m away. There's no point pumping water out of the pit if the roof is dumping it back beside the same wall.
- Discharge onto a permeable surface that slopes away, not against the foundation.
- Keep it off walkways and driveways, where it can freeze into a sheet of ice.
- Don't aim it at a neighbour's property.
- Never tie it into the sanitary sewer.
- Protect the outside section of the line so it doesn't freeze shut in January.
Do you need a permit to install a sump pump?
It depends on where you live, and on whether you're claiming a subsidy. Here's how the rules look around Hamilton.
| Where you live | Permit needed? | Why |
|---|---|---|
| Burlington, Milton (Halton) | Yes, to claim the subsidy | Halton requires a local building permit and a passed final inspection on a new sump pump before it pays. |
| Oakville | Yes in the FDC area, and for the subsidy | The Town lists sump pump and weeping tile work as permit work on properties in its Foundation Drainage Collection system area. |
| Brantford | Yes, per the City's guide | The City's grant guide says a sump pump installation requires a building permit. |
| Hamilton, Ancaster, Dundas, Stoney Creek, Waterdown | Yes, for grant work | The Protective Plumbing Program pays only for permitted, inspected work. |
Rules checked against municipal sources in October 2026.
By contrast, Toronto and Mississauga don't require a permit just to install a sump pump, which shows how much the rules vary from one municipality to the next. We confirm the requirements for your address before we cut the floor, and pull the permit when one is needed.
What installing a sump pump costs
Here's what sump work typically costs in the Hamilton area. Your real number comes from a written quote after we've seen the basement.
| Job | Typical cost | What's included |
|---|---|---|
| New pit and pump in an existing basement | $1,500 to $3,500 | Slab cut, sealed basin, pump, check valve, discharge line and floor patch |
| Pump replacement in an existing pit | $500 to $1,400 | New pump, usually a new check valve, and testing |
| Battery backup added | $800 to $1,800 | Second pump, battery, charger and alarm |
| Full interior drainage with a sump, detached house | $10,000 to $20,000 | Perimeter drain, wall membrane, sump and discharge |
Typical Hamilton-area ranges before tax. A dedicated circuit, a long or awkward discharge run, or a deep pit add to the price.
Where you live can change what you actually pay. In Halton, disconnecting the weeping tile and installing a new sump pump is covered at 100% up to $6,500. Our guide to basement flooding subsidies has the details for every municipality we serve.
DIY or hire it out?
A handy homeowner can swap a pump in an existing pit. Cutting a new pit is a different job: you're breaking out concrete, digging below the slab, connecting to the weeping tile and running a line through the foundation wall. Put the pit in the wrong place or get the discharge wrong and you've spent the money without solving the problem.
Around Hamilton, the subsidy rules are the bigger reason to hire it out. Halton only reimburses labour when a contractor does the work, and it needs a permit and a passed final inspection. Hamilton's full $2,000 grant requires a City pre-qualified plumbing or drain contractor, so ask anyone quoting your job whether they're on the City's current list, and it only covers a new sump pump and pit when they're installed together with a backwater valve. A replacement pump isn't covered at all.
Backwater valves themselves need a plumbing permit and are normally installed by a licensed plumber. Basement Worx handles the sump, drainage and waterproofing side of the job.
Keeping a sump pump working
- Test it every spring: pour a bucket of water into the pit and make sure the pump starts, empties it and shuts off.
- Keep the pit clear of debris that can jam the float or clog the intake.
- Check the outside end of the discharge line after storms and in deep cold.
- Plan to replace the pump at around 7 to 10 years, before it fails rather than after.
- If you have a battery backup, test it too, and replace the battery every few years.
A backup pump is the best insurance against a storm outage. Read battery vs water-powered backups to compare the options.
Sump pump installation questions
How long does it take to install a sump pump?
Can a sump pump be connected to my existing weeping tile?
Does a sump pump stop sewer backups?
How long do sump pumps last?
Do I need a battery backup?
Sump and drainage work we do
Related guides
Basement Worx works across Hamilton, Burlington, Oakville, Milton, Ancaster, Dundas, Stoney Creek, Waterdown, Cambridge, Brantford, Caledonia and Grimsby.