Sewer Line Replacement Cost, Including Under a Slab

How much does sewer line replacement cost?

Sewer line replacement cost has no single local price, but Fixr's national estimate, updated January 31, 2025, runs from $1,000 to $20,000. That is a range drawn from contractor pricing across the country, so a bid in New Orleans or Jefferson Parish can land anywhere inside it, or outside it. The low end fits a short repair of one broken section under open lawn. The high end fits a long or deep run, a line under the house, or a job with a driveway or sidewalk to rebuild.

Treat any figure quoted before a camera inspection as a guess. A licensed plumber who has run a camera through the line (the sewer camera inspection guide explains what the video shows) can say how many feet are bad, how deep the pipe sits and which method fits. Ask for at least two written bids that state the length replaced, the method, the new pipe material and who pulls the permit.

What drives the cost of a sewer line?

Six things move a sewer bid most: length, depth, access, method, the permit and what has to be put back afterward. Length and depth set how much digging or lining the job needs. Access covers whether the pipe runs under open lawn, a driveway, a patio, a big tree or the house itself. Restoration is the line item owners forget: sod, concrete, flooring and cabinets that come out must go back in.

The pipe's own condition matters too. EPA's guide for evaluating sewer systems says the choice of rehabilitation method depends on pipe size, type, location, sewer flow, surface conditions and other physical factors. A line with roots at a few joints is a different job from one that is flattening along its length, as Orangeburg pipe does, or one with a low spot that holds water (a sewer line belly).

How much does it cost to replace a sewer line under a slab?

No verified figure exists for replacing a sewer line under a concrete slab, so this guide gives none; the price turns on how the crew reaches the pipe. In a slab house the building drain runs through the soil under the floor before it leaves the house, so a break there means cutting the slab from inside or tunneling to it from outside. Cutting the floor adds concrete, flooring and sometimes cabinet work. Tunneling keeps the floor intact but means digging and later backfilling a tunnel; the tunneling under a slab guide covers how that works.

For scale, Fixr (May 2025) prices a whole tunneling job nationally at $900 to $2,000. That covers getting to the pipe, not the new pipe itself. Ask each contractor to split the bid into access, pipe work and restoration, so bids can be compared line by line instead of as one lump sum.

Trenchless or open trench: which costs less?

Neither method is always cheaper; it depends on what sits above the pipe and what shape the pipe is in. EPA's guide describes two routes for structural repair: dig up and replace or line one or two segments (point repairs), or use trenchless methods that work through existing access points or a few small pits. Open trench means digging along the whole run. It is often simplest under open lawn, and the City of Ann Arbor calls trenching the standard way to replace Orangeburg pipe.

Trenchless options include cured-in-place lining and pipe bursting. In a lining job a resin-filled liner is pulled through the old pipe and cured into a new pipe inside it; the City of Columbus describes filling the liner with hot water so it hardens, and asks residents to stop using water for about four hours. Pipe bursting pulls a new pipe through while breaking the old one outward, and Ann Arbor lists it as an emerging alternative. Columbus also notes that a lateral too damaged for the liner to be pushed through has to be dug up and replaced. Trenchless work tends to save the most where digging would destroy a driveway, a mature tree or a finished floor.

Who pays for the line to the city main?

In New Orleans the owner pays for everything from the property line to the house, and the stretch from the main to the property line depends on the lot. R.S. 33:4090, as amended by Act 227 of 2020 and linked from the Sewerage and Water Board's connection page, says the owner bears all costs for initial connections from the main to the property line. The exception is a lot of record that existed before 1954: the board installs one sewer connection and one water connection to the property line at its own expense. The law also says the board pays to repair a main-to-property-line connection that its own work disrupts.

The statute speaks of initial connections, so for a repair to an existing line between the property line and the main, ask the board's House Connections department before work begins. Its connection page says work on public property needs a contractor licensed in Louisiana as a Municipal and Public Works contractor, and the board inspects work on both sides of the property line. The board's customer FAQ adds that homeowners are responsible for maintaining their sewer cleanouts. Other places draw the line differently: Los Angeles County Public Works makes owners responsible for the entire length of the lateral. Jefferson Parish's rules were not checked for this guide, so ask the parish before work starts.

When is a repair enough instead of replacement?

A spot repair is often enough when the camera shows one bad section in otherwise sound pipe. EPA's guide notes that excavated repairs are usually limited to one or two pipe segments, and that non-structural repairs seal leaking joints in pipe that is otherwise sound. Roots at a joint or two, one cracked hub or a single offset joint can fit that pattern.

Replacement makes more sense when damage repeats along the run: pipe that is flattening, many root-filled joints, long sags, or a material known to fail, such as Orangeburg. Cast iron that is scaling or cracking in several places is another case; the cast iron drain pipe guide covers its warning signs. Ask the plumber to mark each defect by its footage on the video, so a second contractor can check the repair-or-replace call.

Does homeowners insurance help pay for a new sewer line?

Usually not for a line that has simply worn out, though policy wording decides. Louisiana's insurance department, in its homeowners insurance consumer guide, says most policies exclude water that backs up through sewers or drains and earth movement, and that extra coverage can sometimes be bought for excluded items. The NAIC's consumer guide says a homeowners policy "isn't a maintenance contract" and lists sewer and drain backup as an endorsement. Ask the insurer in writing before work starts; the sewer backup guide covers backup endorsements and backwater valves.

Common questions

Related guides

• Sewer & drainsSewer camera inspection
• Sewer & drainsOrangeburg pipe
• Slab leaksTunneling under a slab
• All guides