If your basement has ever flooded with sewage after a big storm, a backwater valve is the fix. It is a one-way gate on your main sewer line: waste flows out as normal, and the valve slams shut if the city sewer overloads and tries to push water back into your home.
The two questions we get most: what does it cost, and is there a rebate? Here is a straight answer for Durham Region homeowners.
What a backwater valve costs to install
A backwater valve install is real work. The valve sits on your main sewer line under the basement floor, so we cut into the concrete to reach it, set the valve to code, and patch the floor back with an access cover for future maintenance.
Because of that, most installs in Durham Region run roughly $2,500 to $4,500, depending on:
- How deep the sewer line sits and how easy it is to reach
- Whether the floor is finished (tile or hardwood over the concrete adds work)
- The access and layout of your basement
- Permit requirements
Every home is different, so we quote the full job flat before any cutting starts. No surprises once we open the floor.
Why the price varies so much
Two houses on the same street can get different quotes. A valve going into an open, unfinished basement with easy access to the main line is a straightforward day of work. A valve under a finished basement floor, with tile or laminate to cut through and restore, takes longer and costs more. The depth of your sewer connection matters too. We look at all of it before we give you a number.
The rebate: check your municipality
Here is the part that can offset a big chunk of the cost. Several Durham Region municipalities and the Region itself have offered basement flooding or backwater valve subsidy programs to help homeowners protect against sewer backups.
Two important notes:
- Programs change and vary by town. Ajax, Whitby, Oshawa, Pickering, Clarington, and the Region of Durham have each run their own versions at different times, with different amounts and rules.
- Confirm the current program before you book. Check with your municipality (or the Region of Durham) for what is available right now, how much it covers, and what paperwork they need. Many require the work to be permitted and done by a licensed plumber, which we handle.
We do not quote the rebate amount here because it shifts, but it is worth a five-minute call to your town before you schedule the work. It can meaningfully lower your out-of-pocket cost.
Is a backwater valve worth it?
If you are in a flood-prone area or have had a sewer backup before, yes. A sewage backup cleanup runs into the thousands and is miserable to deal with. The valve is a one-time install that protects your basement every storm after. Older neighbourhoods on aging sewer connections and low-lying homes near the lake benefit most. We break down who needs one in do you need a backwater valve.
Get a flat quote
We install backwater valves across Durham Region, handle the permit, and set everything to code with a proper access cover. You get the full price flat before we touch the floor.
Call us at (647) 560-2817 or request a free estimate. Learn more on our backwater valve installation page, and if a backup is happening right now, our 24/7 emergency plumbers can help.
Frequently Asked Questions
How much does a backwater valve cost in Durham Region?
Most installs run roughly $2,500 to $4,500, depending on how deep the sewer line sits, whether the basement floor is finished, and access. The valve goes under the concrete floor, so the work includes cutting and patching. We quote the full job flat before any cutting starts.
Is there a rebate for a backwater valve in Durham?
Often, yes. Several Durham municipalities and the Region of Durham have offered basement flooding or backwater valve subsidies. Programs change and vary by town, so confirm the current one with your municipality before you book. Most require a permit and a licensed plumber, which we provide.
Do you have to break the basement floor to install one?
Yes. The valve installs on the main sewer line beneath the floor, so we cut the concrete, set the valve to code, and patch it back with an access cover so it can be checked and cleared later. Most installs take part of a day.
How do I know if I need a backwater valve?
If your basement has flooded with sewage after heavy rain, or you live in a low-lying or older neighbourhood on an aging sewer line, you are a strong candidate. A backwater valve stops the city sewer from pushing waste back into your home during a storm overload.