Trenchless sewer line replacement cost (2026):
pipe lining vs. pipe bursting
HOW MUCH DOES TRENCHLESS SEWER LINE REPLACEMENT COST?
Trenchless sewer line replacement typically costs $1,900 to $6,000, with an average of about $2,900 (Angi). In Seattle, Angi puts the average at $3,222. Priced per foot, This Old House and HomeGuide list about $60 to $250, and the length of your line changes the total the most.
Two ways to replace a sewer line without a trench
"Trenchless" usually means one of two methods. Both need only small access points instead of a trench along the whole pipe. Angi notes there may still be minor digging at the street and where the line enters the home.
| Pipe lining (CIPP) | Pipe bursting | |
|---|---|---|
| How it works | A resin-coated liner is pulled through the old pipe and hardens into a new pipe inside it | The old pipe is broken into small pieces while a new pipe is pulled in behind |
| When it fits | The old pipe is "not severely damaged" (Angi) | The line is too damaged to line (Angi Seattle) |
| Cost per foot (Angi) | $135–$150 | $150–$190 |
| Cost per foot (HomeGuide) | $90–$250 | $60–$200 |
| Lifespan | Liners are "rated to last up to 50 years" (Angi) | Depends on the new pipe. This Old House says modern sewer lines last 50–100 years by material. |
Cost per foot: what each guide says
| Source | Area | Trenchless, per linear foot | Average project |
|---|---|---|---|
| Angi | U.S. | $135–$190 | $2,900 ($1,900–$6,000) |
| Angi | Seattle | $87–$360 | $3,222 ($2,111–$6,666) |
| This Old House | U.S. | $60–$250 | — |
| HomeGuide | U.S. | $60–$250 | — |
A note on the averages: multiplying the per-foot rates by a typical length gives totals well above Angi's project averages. The guides don't explain the gap. When you compare quotes, compare both the price per foot and the total for the same length.
Trenchless cost by length
| Length of line | U.S. (Angi) | Seattle (Angi) |
|---|---|---|
| 25–35 ft | $1,500–$8,750 | $2,200–$12,700 |
| 35–45 ft | $2,100–$11,250 | $3,000–$16,300 |
| 45–55 ft | $2,700–$13,750 | $3,900–$19,900 |
| 55–75 ft | $3,300–$18,750 | $4,800–$27,200 |
| 75–100 ft | $4,500–$25,000 | $6,500–$36,300 |
The same 40-foot line, three ways
Angi uses about 40 feet as the average side sewer length in Seattle. Here is what that length costs at each method's published per-foot rate.
| Method | Rate per foot | 40 ft | Not included |
|---|---|---|---|
| Pipe lining | $135–$150 (Angi, U.S.) | $5,400–$6,000 | Camera, permit, tax |
| Pipe bursting | $150–$190 (Angi, U.S.) | $6,000–$7,600 | Camera, permit, tax |
| Dig and replace | $70–$250 (Angi, Seattle) | $2,800–$10,000 | Camera, permit, tax, plus restoring the lawn, driveway or sidewalk |
Trenchless isn't always cheaper on the invoice. Angi says "trenchless systems tend to cost more" than traditional methods. Any savings tend to come from what doesn't need rebuilding afterwards. HomeGuide lists landscaping restoration at $4–$12 per sq ft and major driveway repair at $600–$3,000.
Which method might fit your pipe?
A camera inspection is the way to find out. Questions worth asking about the video:
- How damaged is the pipe? Angi says lining needs a pipe that is "not severely damaged." A line too damaged for lining needs bursting instead.
- Are there roots or collapsed sections? Angi notes these may need extra repairs or extra digging. Angi Seattle lists extra labor for minor digging or root removal at $90–$360 per hour.
- Does the pipe sag? Angi says clay soil in Seattle can cause sagging pipes. Ask how the method you're quoted handles a sag on your video.
- What is the pipe made of? Angi says older Seattle homes often have Orangeburg pipe, which may need replacement.
- Is the line shared? In Seattle, neighbors share responsibility from the point where their side sewers join (Seattle Public Utilities).
This Old House: trenchless methods "aren't suitable for every situation." A plumber can recommend a method based on the pipe's condition, the property and local code.
Extra costs to ask about
| Item | Cost | Source |
|---|---|---|
| Camera inspection | $175–$350 | Angi (HomeGuide: $125–$500) |
| Seattle side sewer permit, sanitary repair | $280, includes 1–2 inspections | Seattle Public Utilities |
| Extra digging or root removal (Seattle) | $90–$360 per hour | Angi Seattle |
| Sales tax (Seattle) | 10.55% of the contract | WA Department of Revenue |
- Look the contractor up on L&I's Verify a Contractor tool: active license, bond, insurance and past violations.
- For jobs of $1,000 or more on a home, the contractor must give you a written disclosure statement before work starts (RCW 18.27.114).
- Get the method, the length, the pipe or liner material and the warranty in writing, and ask for the camera video before and after.
Frequently asked questions
How much does trenchless sewer line replacement cost?
Angi puts the typical cost at $1,900 to $6,000, with an average of about $2,900. In Seattle, Angi lists an average of $3,222 and a typical range of $2,111 to $6,666. Per-foot rates run from about $60 to $250 (This Old House, HomeGuide).
Is pipe lining cheaper than pipe bursting?
The guides disagree. Angi lists pipe lining at $135–$150 per linear foot and pipe bursting at $150–$190. HomeGuide lists lining at $90–$250 and bursting at $60–$200. Lining only works if the old pipe is not severely damaged (Angi).
Is trenchless cheaper than digging?
Not always. Angi says trenchless systems tend to cost more than traditional methods. Any savings usually come from less lawn, driveway or sidewalk to restore afterwards.
How long does a pipe liner last?
Angi says liners are rated to last up to 50 years, with tree roots as the main threat.
Do I need a permit for trenchless sewer work in Seattle?
Yes. Seattle Public Utilities requires a side sewer permit for repairs and alterations. A sanitary repair permit on private property generally costs $280, including one to two inspections.
Sources
- Angi — How Much Does Trenchless Sewer Line Piping Cost? (updated Jul 10, 2026)
- Angi — How Much Does Trenchless Sewer Line Replacement Cost in Seattle, WA? (updated Apr 8, 2026)
- Angi — How Much Does Sewer Line Replacement Cost in Seattle, WA? (updated Mar 6, 2026)
- This Old House — How Much Does a Sewer Line Replacement Cost? (updated Mar 30, 2026)
- HomeGuide — How Much Does Sewer Line Replacement Cost? (edited Dec 22, 2025)
- Seattle Public Utilities — Your Side Sewer
- Seattle Public Utilities — Side Sewer Permits
- Washington Department of Revenue — Custom construction and Seattle rate change, January 1, 2026
- Washington State Legislature — RCW 18.27.114 and L&I — Hiring a contractor
All sources accessed October 8, 2026.
These figures are estimates compiled from the published sources above. They are not quotes and can't account for your pipe, your property or your contractor. Permit and tax rules can change, so confirm them with your contractor and your sewer utility. Get written estimates from licensed, bonded and insured contractors before deciding. See our disclosure and disclaimer.