How much do contractors charge for main sewer line replacement in New Brunswick?

Main sewer line replacement in New Brunswick typically runs $5,000–$20,000+, depending on the method used, the length of the line, and site conditions. That's a wide range, so let me break down what actually drives the cost.

The biggest cost variable is whether you're going traditional open-cut excavation or trenchless replacement. Open-cut excavation — digging a trench from your foundation to the municipal connection — is the most common method in NB and generally runs $5,000–$12,000 for a typical residential line (15–30 metres). That price includes excavation, new PVC pipe (4" or 6" diameter), backfill, and basic surface restoration. If you have a concrete driveway, mature landscaping, or a deep line (which is common in NB given our 4-foot frost depth requirement — lines are buried well below that), costs climb quickly.

Trenchless methods (pipe bursting or pipe lining/CIPP) cost more upfront — typically $8,000–$20,000 — but save on restoration costs since you're not digging up your yard or driveway. Not every contractor in NB offers trenchless, and not every pipe condition is suitable for it. A camera inspection first (usually $300–$600) will tell you what you're dealing with.

A few NB-specific factors that affect your number significantly:

Clay soils and high water tables are common across much of New Brunswick — particularly in the Moncton area, Fredericton's river valley, and coastal communities. Wet, unstable soil means more shoring, slower digging, and sometimes dewatering equipment. Expect costs toward the higher end if your contractor mentions groundwater during the assessment.

Older homes in Saint John, Fredericton, and Moncton may still have original clay tile or Orangeburg pipe (a compressed tar-paper pipe common in homes built before 1970). These require full replacement rather than lining, and root intrusion from mature trees often complicates the dig.

Municipal connection fees are separate from the contractor's price. Reconnecting to the municipal sewer main requires coordination with your city or town public works department — some municipalities charge a reconnection fee, and you'll need the street opened if the connection is under pavement. Budget an additional $1,000–$3,000 for this depending on your municipality.

On the permit side, all sewer work in New Brunswick requires a plumbing permit through NB Dept. of Justice and Public Safety — Technical Inspection Services (TIS), reachable at 1-888-659-3222. The work must be done by a licensed plumber. This isn't optional — unpermitted sewer work can create serious liability issues when you sell the home, and your homeowner's insurance may not cover a future sewage backup if the work wasn't inspected.

If you're on a private septic system rather than municipal sewer, the regulatory path is different — that falls under NB Reg 2009-137, and TIS handles septic permits through a separate line: 1-844-249-6533.

Get at least three quotes, and ask each contractor specifically whether their price includes permit fees, surface restoration, and the municipal connection. Those exclusions are where estimates balloon. A reputable contractor will pull the permit themselves — if someone offers to skip the permit to save money, walk away.

Browse licensed plumbing contractors in our directory at the New Brunswick Construction Network to find professionals serving your area of the province.