Sewer line replacement in Calgary, how many days does it take?

Duration depends heavily on what method is used and what the pipe runs under, but most residential sewer line replacements in Calgary take somewhere between one and five days of active work on site.

What actually drives the timeline

A short spot repair, say a cracked section under the backyard, can be dug, fixed and backfilled in a single day if the crew hits no surprises. A full dig-and-replace from the foundation to the property line typically runs two to four days: one day to open the trench, one to pull the old pipe and lay the new one, and one to backfill and restore the surface. Add a day if the line runs under a driveway, a deck or mature landscaping that has to come up carefully.

Trenchless methods, pipe bursting or cured-in-place lining, often finish the underground work in one day because there is no open trench to manage. What takes longer is the setup, the camera inspection before the job, and the curing time for a liner. Budget two to three days total for a trenchless job, sometimes less.

Concrete cutting adds time. If the line runs under a basement slab, the crew has to cut, remove and later pour new concrete. That alone can add one to two days, plus a waiting period before the slab is strong enough to walk on.

The permit and inspection add calendar days, not necessarily work days. The City of Calgary requires a plumbing permit for sewer line replacement. The contractor pulls the permit before starting; starting without one doubles the permit fee. A rough-in inspection is required before the trench is backfilled or the slab is poured, so the crew has to pause and wait for a City inspector to sign off. If the inspection is booked same-day or next-day, this is a short wait. If the schedule is tight, it can stretch the job by a day. The final inspection happens after the work is complete.

The contractor must be a certified journeyperson plumber or a registered apprentice working under one. Ask to see the trade certificate before signing anything.

A realistic total timeline from quote to finished trench is often one to two weeks, once you account for the permit application, material lead times, and the inspection hold. Some contractors can move faster; others are booked out. Get a written schedule in the contract.

A fair quote for this job should include: the camera inspection report (insist on seeing the footage), the method and pipe material, the permit and inspection, excavation and backfill, concrete cutting and patching if needed, surface restoration, haul-away of the old pipe and spoil, and a warranty on both parts and labour. Compare quotes by scope, not just the total. Typical Calgary figures for 2025-2026 run from about $1,000 to $3,000 for a spot repair, $5,000 to $12,000 for trenchless work, and $4,500 to $15,000 or more for a full open-cut replacement depending on depth, length and what sits above the line.

Before paying any deposit, confirm the contractor holds an Alberta prepaid contracting licence (Service Alberta), ask for a WCB-Alberta clearance letter, and get everything in a signed written contract that includes start and completion dates.

After the job is done, keep the permit, the inspection sign-off, the camera footage from before and after, and the contractor's warranty in writing; those documents matter if you sell the house or a dispute comes up later.