Sewer line replacement: frequently asked questions

Renewing the pipe that carries sewage from a house to the municipal main or a septic tank along its whole length, by digging a trench and laying new pipe, by pipe bursting, or by relining the old pipe with a structural liner.

A repair fixes one location, by a small dig or a sectional liner, and leaves the rest of the old line in service. Replacement or full relining renews the whole line, so the old joints and weak spots are gone end to end.

A recorded camera inspection is the evidence. Collapse, deformed or fibre pipe, fractures or holes along much of the line, a belly holding water, or roots at most joints of an old clay line usually justify replacement or relining. See when to replace a sewer line.

When the footage shows widespread structural damage, when maintenance can no longer keep it flowing, or before building something expensive over a failing old line. Age alone is not enough, though lines of 70 years or more deserve a full-length option in every quote.

Open-cut excavation, full-length CIPP relining, pipe bursting, and, for single defects, excavated spot repairs or sectional liners. Guided boring along a new path is used occasionally. The defect, grade, depth and surface decide which fit.

Renewing a sewer from access points instead of a full trench: either curing a new liner inside the old pipe, or bursting the old pipe while pulling a new HDPE pipe into its place. See how trenchless sewer replacement works.

Yes, where the old pipe still holds its grade and the ground above it is expensive to disturb: a driveway, mature trees or finished landscaping. It is the wrong choice for a sag, and lining is wrong for a collapsed or deformed pipe.

No. A liner copies the dip and bursting follows the old path. The sagging section must be excavated, re-bedded and re-laid on grade. The rest of the line can often still be lined.

For an open-cut house lateral, gasketed PVC sewer pipe such as SDR 35 or SDR 28 on proper bedding is the usual choice. Fused HDPE is standard for bursting. ABS or PVC DWV suits the building drain under the slab.

Typically one to three days on site for open cut, about a day for lining, one to two days for bursting and about a day for a spot repair, once permits and locates are in place. Restoration can follow later, especially in winter.

Burst replacements are new HDPE pipe with a long design life. CIPP liners are commonly designed for around 50 years. Installation quality, preparation and end seals decide the real life.

Possibly on the private side, where your municipality issues homeowner permits. The municipal connection usually requires approved contractors, and trench safety, locates and inspection always apply. Many owners handle preparation and restoration instead.

Municipalities maintain the mains and, in many Canadian cities, the lateral from the property line to the main. The owner usually handles the private side. Rules differ between cities, so confirm with yours; in Calgary, call 311.

Usually not the pipe itself. Sewer backup endorsements typically cover damage inside the house. Some insurers offer separate service line coverage that can pay for repairing the pipe. Ask your broker what your policy says.

For your own home, generally not. For a rental property, the Canada Revenue Agency distinguishes current expenses from capital expenses, and a replacement can fall on either side depending on the facts. Get advice from an accountant.

It seldom adds value dollar for dollar, but it removes a risk buyers and their inspectors look for in older homes. A permit record, a finished-line video and a written warranty make the work visible to a buyer.

As 2026 planning ranges in CAD, open-cut replacement of a 15 to 25 m lateral typically quotes about $12,000 to $35,000 or more, relining about $9,000 to $28,000 and bursting about $10,000 to $30,000. See the cost page and SewerQuotes.com.

Because most of the cost is getting to the pipe and restoring the surface: deep excavation with trench protection, work around utilities, the municipal connection, permits, equipment and rebuilding lawns, driveways or landscaping. The pipe itself is a small share.

Many owners use contractor payment plans, lines of credit or home equity. Tie payments to milestones, keep the final payment until the finished-line video is delivered, and compare borrowing costs before signing.

Usually by saw-cutting a trench in the floor, replacing the drain with ABS or PVC on compacted bedding, testing and inspecting it, then re-pouring the concrete. A round pipe on grade can sometimes be lined instead.

Open cut removes it; lining leaves it as the host around the new liner; bursting leaves it in fragments in the soil. A line that is rerouted is abandoned: disconnected, capped at both ends and recorded.

In most Canadian municipalities, yes: a plumbing permit and an inspection before backfill, plus permission for any work on the boulevard or road. Your contractor usually applies. Confirm with your municipality.

Usually. The main disruption is drainage: you cannot use water that drains to the line while it is open, being lined or being burst. Ask for the no-use window in writing.

Plumbing contractors with excavation crews, drain companies that do replacement themselves or through partners, trenchless specialists and underground utility contractors. Ask who does each part and whose warranty covers it.

No. Sewer backup coverage pays for cleanup and damage inside the house after a backup. Repairing the buried lateral is covered only by a separate service line endorsement, and only if it was in place before the failure.

Often. Relining works from a cleanout when the pipe is round and on grade, and bursting needs only a pit at each end. A sag or collapse still needs excavation, usually a saw-cut strip rather than the whole driveway.

Replacement, by pipe bursting or open cut. Bituminous fibre pipe softens and deforms with age, and a liner would take on that deformed shape, so relining is generally not suitable once the pipe has gone oval.

Usually the condominium corporation, when the line is a common element under the declaration, as drains serving several units and the building sewer typically are. Unit owners should report problems in writing to the board or manager.

Yes, when the tank and disposal field are sound. Have the tank pumped and inspected first to confirm the pipe is the problem, protect the inlet baffle during the connection, and get the permit your local authority requires.

A written workmanship warranty from the contractor stating the metres covered, the years, exclusions and transferability, plus the manufacturer's material warranty for the pipe or liner. Tie it to the finished-line video.