Sewer Line Replacement Cost in Ontario (2026): Camera First, Open Cut vs Pipe Bursting vs Lining by the Foot, the Driveway, the Tree and the Line to a Septic Tank

The numbers

October 2026, before HST. If the trouble is the pipe inside the house, the old cast iron under the floor or the water pipes, see the old pipe replacement page.

Camera First, Shovel Second

A slow drain is a symptom, not a diagnosis. It might be roots in one joint, a sag where the soil settled, a crushed section, or a lump of something a previous owner flushed in 1987. A plumber who quotes a full replacement without putting a camera down the line is guessing with your money.

A camera inspection is $150 to $500, usually from a cleanout or a pulled toilet. Ask for the video and a locate, so you know where the problem sits and how deep. The footage tells you whether this is a $3,500 spot repair or a $20,000 lateral, and it is the one document every other quote should be priced from.

Buying an older house? A pre-purchase camera with the footage is $280 to $500. On a street of 1950s houses with big maples on the boulevard, that is the best $400 in the deal.

What the camera usually finds in older Ontario neighbourhoods: clay tile with roots growing in at the joints, Orangeburg (a tar-paper pipe that goes oval with age), cast iron that has scaled and cracked, or a newer plastic pipe that is fine apart from one belly. The fix depends on which.

Three Ways to Fix It

Open cut. Dig a trench, take out the old pipe, lay new, inspect, backfill, patch the surface. It is the most expensive by the foot and the only option when the pipe has collapsed or sags badly. The bonus is that you see everything.

Pipe bursting. Dig a pit at each end and pull a bursting head through the old pipe, dragging a new plastic pipe in behind it. The old one is cracked outward into the soil. It needs a continuous path and does not like a line with a lot of bends.

Lining. A resin-soaked liner is pushed into the old pipe and cured in place, making a pipe inside a pipe. It works when the old line still holds its shape. It does not fix a sag; the liner just follows the dip.

Here is one 40 ft lateral, 20 ft of it under an asphalt driveway, priced three ways. The patch assumes a trench about 4 ft wide through the drive, 80 sq ft; that width is our assumption.

Before HST. Interlock or concrete instead of asphalt, at $20 to $45 a sq ft, makes the open-cut patch $1,600 to $3,600. The trenchless jobs still dig access pits; ask whether they are in the price.

Who Owns Which Part, and the Permit

The lateral usually crosses two owners: your lot, and the road allowance between your property line and the main. Where your part ends, and who pays when roots from a city tree are the cause, varies by municipality. Call the city’s sewer or works department before you sign anything; some will check their side, and sometimes the problem turns out to be theirs.

Replacing a building sewer needs a plumbing permit, and the building sewer is inspected before backfill. Nothing gets covered before inspection. Halton Region will pay 50 percent of lateral lining up to $4,000 if you qualify, so a $4,800 lining invoice would get $2,400 back. Check before you book; the details are on the sump and backwater valve page with the other flood programs, and the permit rules are on the plumbing permit page.

1. Put in a cleanout while the trench is open. From about $650 installed, and the next camera or snake goes in from outside instead of through your toilet.
2. Ask about the tree before the machine shows up. Roots found the old line for a reason, and cutting a big one can kill the tree. That is a separate conversation with the city or an arborist.
3. Get the depth in writing. A lateral at 8 ft costs more to dig than one at 4 ft, and it is the number most often missing from a quote.
4. Add a backwater valve if you are digging anyway. The line is open, the plumber is there, and the permit is already being pulled.

In the Country: The Line to the Septic Tank

Most rural houses in Simcoe County and Georgian Bay have no lateral to a street. They have a building sewer that runs from the house to the septic tank, usually a short run, and the same problems apply: roots, settling, a crushed section under a driveway that a cement truck crossed once. The camera works just as well, and the fix is usually a dig, because the run is short and there is rarely pavement on it.

Before anyone digs near the tank or the bed, know where everything is. Under the Building Code clearances the tank has to be at least 15 m from a well, and the bed 15 m or 30 m depending on the well’s casing. The septic systems guide covers the system, and SepticReplacement.ca covers replacing one. On a Georgian Bay lot, the trench is the same kind of work GeorgianBaySiteworks.ca does. A rural building sewer repair is quoted per job: length, depth, rock and whether the tank is part of the problem drive the price.

Questions people ask

Sources and further reading

• A municipal guide to plumbing permits (Thunder Bay): what needs a plumbing permit and the inspection stages, from underground to final.
• Halton Region basement flooding subsidy: the sump pump, weeping tile disconnection and backwater valve amounts.
• SepticReplacement.ca: septic system replacement in Ontario: tanks, beds, clearances and permits.