Key takeaways
- Toronto’s Basement Flooding Protection Subsidy now pays up to $6,650 per property for work done on or after November 12, 2025.
- It covers 80% of a backwater valve up to $1,600 per valve (two maximum), up to $2,250 for a sump pump, $300 for a battery backup, $500 for an assessment and $400 for weeping tile severance.
- A backwater valve needs a building permit, $38.67 per valve in 2026, and must be inspected before it is covered.
- The contractor must hold a valid City of Toronto business licence, or the City will deny the funding.
- Apply within two years of installation, and add flood protection during a basement renovation when the floor is already open.
Short answer: Toronto’s Basement Flooding Protection Subsidy now pays up to $6,650 per property, almost double the old maximum. It covers 80% of the cost of a backwater valve up to $1,600 per valve (two valves maximum), up to $2,250 for a sump pump plus $300 for a battery backup, up to $500 for a plumbing assessment, and $400 for severing your weeping tiles from the sewer. It applies to work done on or after November 12, 2025, and you have two years from installation to apply. The catch: you need a building permit for the valve, an inspection before it is covered up, and a contractor with a valid City of Toronto business licence.
If you are finishing or renovating a basement in Toronto, this is the best time to add flood protection, because the floor and walls are already open. This guide explains what the subsidy covers, the rules that decide whether you get paid, and how to fit the work into a basement renovation. Everything comes from the City of Toronto’s program and permit pages, checked in November 2026.
What the subsidy pays
| Measure | Maximum subsidy |
|---|---|
| Backwater valve | 80% of the invoiced cost, up to $1,600 per valve, maximum two valves |
| Sump pump | Up to $2,250 |
| Sump pump battery backup | Up to $300 |
| Plumbing assessment | Up to $500 |
| Severing the foundation drain (weeping tile) connection | $400 |
| Total per property | Up to $6,650 |
The program covers work completed on or after November 12, 2025, and applications must be made within two years of installation. Funding is first-come, first-served, so apply promptly once the work is done.
What each measure does
- Backwater valve. Installed on the main sewer line in the basement, it closes when the municipal sewer backs up, so sewage cannot flow back into your basement through floor drains, toilets and showers. This is the measure that prevents the worst kind of basement flood.
- Sump pump. Collects groundwater from around the foundation in a pit and pumps it out to the surface, away from the house. A battery backup keeps it running in a power cut, which is often exactly when storms hit.
- Weeping tile severance. Many older Toronto houses have foundation drains connected straight to the sanitary sewer. Disconnecting them, and redirecting the water to a sump pump, keeps storm water out of the sewer and reduces the chance of backup.
- Plumbing assessment. A licensed plumber inspects how your home is connected to the sewer and recommends which measures you need. It is a sensible first step on an older house.
The rules that decide whether you get paid
Most denied claims come down to process, not the work itself. The City’s requirements include:
- A building permit for the backwater valve. The City requires a permit to install a backwater valve, and the permit fee is $38.67 per valve in 2026.
- An inspection before it is covered. The valve has to be inspected before the floor is closed up. Covering it before inspection can cost you both the permit and the subsidy.
- A licensed contractor. The contractor must hold a valid City of Toronto business licence, or the City will deny the funding.
- Invoices and paperwork. Keep the detailed invoice, permit and inspection records, because the subsidy for a backwater valve is a percentage of the invoiced cost.
- Apply within two years of installation.
A sump pump does not need a building permit in Toronto, but it still has to meet the program’s requirements to qualify for the subsidy.
Why to do it during a basement renovation
Installing a backwater valve or a sump pit means cutting the basement floor. In a finished basement, that means removing flooring and patching afterwards. During a renovation, the slab is often already being opened for new drains, a bathroom or underpinning, so the extra cost of flood protection is lower and the work is invisible once the floor goes down.
Flood protection also protects the investment. A finished basement or a legal basement apartment can represent tens of thousands of dollars in drywall, flooring, cabinets and fixtures, all of which a single sewer backup can ruin. Some insurers also ask about backwater valves and sump pumps, so tell your insurer once the work is done.
Our basement renovation cost guide shows how flood protection fits into a full basement budget, and our guide to renovation permits in the GTA explains the permit and inspection process.
What it could look like for a typical older house
Consider an older Toronto house with foundation drains connected to the sanitary sewer and no backwater valve, being renovated for a basement suite. The flood-protection work could include a plumbing assessment, one backwater valve, a sump pump with battery backup and severing the weeping tile connection. Under the program, that combination is eligible for up to $500 + $1,600 + $2,250 + $300 + $400, or up to $5,050, depending on the invoiced cost of each item. Add a second valve where the plumbing needs one, and the total reaches the $6,650 maximum.
Outside Toronto?
Other GTA municipalities run their own flood-protection programs, with different amounts and rules. Check your city’s website before you start, and keep the same habits: get the permit, get the inspection, use a licensed contractor and keep every invoice.
Add flood protection to your basement project
We build basements across Toronto and the GTA, and we include flood protection in the plan from the start, with the permit, inspection and paperwork handled so you can claim the subsidy. Book a free assessment, or see our basement renovation services.
Toronto basement flooding subsidy FAQs
How much is Toronto’s basement flooding subsidy?
Up to $6,650 per property, covering backwater valves (80% up to $1,600 each, maximum two), a sump pump (up to $2,250), a battery backup ($300), a plumbing assessment ($500) and weeping tile severance ($400).
Does the subsidy cover work I already did?
It covers work completed on or after November 12, 2025, as long as you apply within two years of installation and meet the program’s requirements.
Do I need a permit for a backwater valve in Toronto?
Yes. A building permit is required, the 2026 fee is $38.67 per valve, and the valve must be inspected before it is covered.
Can any plumber install it?
The contractor must hold a valid City of Toronto business licence, or the City will deny the subsidy.
Do I need a permit for a sump pump?
No building permit is needed for a sump pump in Toronto, but it must still meet the program’s requirements to qualify for the subsidy.