Sewer Line Replacement Cost: $60 to $250 per Foot Trenchless

National figures. Length, depth, what sits on top of the line, and your city's permit rules move the total.

Do this now: sewage backing up into the house

If sewage is coming up a drain, stop all water use first, then work down this list:

1. Stop using water. No flushing, showers, laundry or dishwasher anywhere in the house. Every gallon you run has to go through the same blocked line, and Angi lists water rising in a tub or shower when the toilet flushes as a main line sign.
2. Keep children and pets away. The Connecticut health department's sewage fact sheet says sewage contains bacteria, viruses and other germs that can cause disease. If you must step in it, the CDC says to wear rubber boots, rubber gloves and goggles.
3. Stay clear of wet outlets and cords. The Red Cross says not to touch electrical equipment if it is wet or if you are standing in water.
4. Strong rotten egg smell? The Virginia Department of Health says to go outside and call the fire department.
5. Photograph the damage, then call your insurer. Triple-I says to photograph it and save receipts. Do not sign your claim over to a contractor.
6. Call the plumber line. Ask for the service call fee and whether a camera inspection is included once the line is open.

Cleanup is a separate job from the pipe; see sewage cleanup.

Is it an emergency? When a sewer line cannot wait

A sewer line is an emergency when sewage is in the house, and Angi's 2026 emergency figures put an after-hours main sewer line clog at $1,325 to $5,000; HomeGuide lists emergency sewer backup repair at $500 to $3,800.

• Call now: sewage in a tub, shower or floor drain, or a toilet that bubbles when other fixtures run.
• Same day: several drains slow or gurgling at once, which Angi lists as a sign of a sewer line problem.
• Book it this week: a soggy, sunken or extra green strip of lawn over the line, or the same clog coming back. A replacement is planned work, so get the camera look and two prices before you agree to a method.
• After hours, see emergency plumber for what to do before anyone arrives.

Sewer line replacement cost: how much to replace a main sewer line

Replacing a main sewer line costs $3,320 on average in This Old House's March 2026 guide, with most jobs between $1,390 and $5,320. Angi's August 2026 data lands in the same place, a $3,319 average and $1,388 to $5,323 for professional replacement, with outliers from $225 to $10,000.

HomeGuide prices a full 40 foot line higher, at $2,000 to $10,000 with a $6,000 national average, and $50 to $250 per linear foot. The guides differ because a partial replacement of one bad section and a full run from the house to the street are different jobs. Angi lists partial replacement at about $50 per foot. Ask whether a quote covers the whole line or one section, and how many feet.

Trenchless vs dig: sewer line replacement cost per foot

Trenchless sewer replacement costs $60 to $250 per foot in This Old House's and Angi's guides, against $50 to $200 per foot to dig and replace, so trenchless often costs more per foot but less to put the yard back.

Per linear foot. HomeGuide's dig figure covers the trench only, not the pipe and plumbing work.

• Pipe bursting pulls a new line into place while it breaks apart the old one (HomeServe). HomeAdvisor says a pneumatic or hydraulic head does the breaking. It replaces the pipe, so it suits a line that is too far gone to line.
• Pipe lining (cured-in-place pipe, CIPP) sets a resin liner inside the old pipe; as it hardens it seals cracks and forms a watertight pipe (HomeServe). HomeAdvisor says it needs only one excavation point.
• Digging opens a trench to the pipe. HomeServe puts the dig itself at $5 to $12 per foot, then adds landscaping at $4 to $12 per square foot and driveway repair from $100 to $400 at the low end to $600 to $3,000 at the high end. It says the restoration can make a dig cost as much as trenchless, or more.

Trenchless is not always possible. HomeAdvisor says it works only if the pipe has not completely collapsed, and HomeServe says some repairs cannot be done trenchless. Every trenchless job starts with a camera look; see sewer camera inspection for what that costs and what it shows.

What drives the price: length, depth, driveways, trees and permits

Length sets the base price at $50 to $250 a foot (Angi; This Old House), and what sits on top of the line sets the rest. HomeGuide says a typical residential sewer line runs 50 to 150 feet.

This Old House (Mar 2026), Angi (Aug 2026), HomeGuide (Dec 2025), HomeAdvisor (Jun 2026).

• Depth. HomeAdvisor says sewer lines are buried 18 inches to 8 feet deep, most often 18 to 30 inches, and deeper below the frost line in colder regions. This Old House says deeper pipes need more time and specialized equipment.
• Driveway, patio or foundation over the line. This Old House says these add labor and restoration, which is where trenchless saves the most.
• Trees. Triple-I says small roots seeking moisture work into cracks and later cause blockages or major damage.
• Permit and city tap. Most replacements need a permit. A tap or hookup fee applies to a new connection to the city sewer; ask your city whether reusing the old connection avoids it.

When replacement beats repair: pipe age and material

Replacement usually beats repair once the line is near the end of its life, and HomeGuide puts Orangeburg and clay sewer pipe at 30 to 60 years against 50 to 100 years for PVC, cast iron and copper.

HomeGuide (Dec 2025) and This Old House (Mar 2026). Soil, roots and use shorten or stretch these.

• Repair fits small, local damage: minor cracks, minor root growth, a single blockage or a separated joint in otherwise good pipe (This Old House). Angi puts a spot repair of a cracked section at $600 to $1,050.
• Replace when problems are widespread, keep coming back or come from aging material, because repeated repairs add up (This Old House).
• Orangeburg is the case for replacing early. This Old House says it deteriorated over time and PVC has largely replaced it, and Angi says it carries a high risk of collapse.
• Clay and older cast iron are where roots get in: HomeGuide's camera guide says roots are common in older cast iron and clay and less common in PVC. HomeAdvisor says older homes may still have Orangeburg, clay, cast iron or even lead pipe.

Repairs are covered on sewer line repair, including bellies and roots.

How long does a new sewer line last?

A new PVC sewer line lasts 100 or more years in This Old House's 2026 guide, and cast iron 75 to 100 years with proper care; it puts sewer pipe in general at 50 to 100 years depending on material, soil, roots and use. None of the guides we checked gives a lifespan for a cured-in-place liner, so ask the company what its liner is rated for and what the warranty covers, in writing.

Who pays for sewer line replacement: you or the city?

The homeowner usually pays for the private sewer line and the city for the public main, in HomeGuide's words, and Triple-I says the lateral is owned and maintained by the property owner. Where your part ends, at the property line or at the main under the street, depends on your city, and an HOA may cover the line in some condos and townhomes (HomeGuide).

Call your sewer utility before you pay for street work. Our city pages list the local rule and the number to call: sewer line repair in Houston, Los Angeles, San Diego and Denver.

Does homeowners insurance cover sewer line replacement?

A standard homeowners policy usually does not pay to replace a worn sewer line, but service line coverage can: the Texas Office of Public Insurance Counsel gives $10,000 or $25,000 of coverage with a $500 deductible as a typical example, and says it is not usually in the base policy.

• What it pays for. Texas OPIC says service line coverage pays to repair or replace the line, plus excavation and landscape restoration, and typically covers wear and tear, corrosion, tree roots and collapse. It typically excludes septic systems and pipes under the house.
• Limits by age. The Maryland Insurance Administration describes limits of $10,000 for a line under 50 years old and $2,500 for one 50 or older, with the policy deductible applying. It says the coverage usually does not pay for a blockage with no physical damage.
• Not the same as a warranty. Maryland says service line warranties sold by non-insurers may protect differently, and This Old House says basic home warranties rarely cover sewer repairs.
• Sewage damage inside is separate. Florida's Department of Financial Services says homeowners policies do not typically cover water backup; a water backup endorsement covers water that backs up from a sewer, sump or drain.
• Buy it before trouble. Angi says some insurers offer endorsements and to read the fine print. Call your insurer to ask what your policy covers.

Questions to ask before you sign a sewer replacement quote

• Can I see the camera video? Ask where the damage is, in feet from the cleanout, and for a copy.
• Bursting, lining or digging, and why? And whether the pipe is sound enough to line.
• How many feet, at what price per foot? The whole line or one section?
• Who pulls the permit, and is any city tap fee in the price?
• Is restoration included? Lawn, driveway, sidewalk and landscaping.
• What is the warranty on the pipe or liner and the labor? In writing.
• License number and proof of insurance. Ask for the plumber's license number and proof of insurance yourself; the plumbing license table shows who licenses plumbers in six states.

Clogs that keep coming back may need hydro jetting rather than a new line; ask the plumber which the camera points to. More plumbing prices: how much a plumber costs, drain cleaning and home repair costs. Calls go to an independent company that serves your area and takes this kind of job; hours vary. How calls work.