Bursting vs. lining at a glance
| # | Pipe bursting | Pipe lining (CIPP) | |
|---|---|---|---|
| T-01 | How it works | A bursting head fractures the old pipe outward while pulling a new pipe in behind it | A resin-soaked liner is inserted and cured in place, forming a pipe inside the pipe |
| T-02 | Digging | Usually an entry and an exit pit | Often through a cleanout; sometimes a small pit |
| T-03 | Old pipe condition | Can be cracked or broken, but must be passable | Must still hold its shape; cleaned of roots first |
| T-04 | Diameter | Same size or larger | Slightly smaller inside |
| T-05 | Fixes a belly or bad slope? | No, follows the old path | No, follows the old shape |
| T-06 | Published cost | $60–$200+/ft | $80–$250+/ft |
| T-07 | Central San note | Pre-TV inspection required for the permit | Permit still required for outside work |
Deeper comparison, including warranty questions: pipe lining vs. pipe bursting.
Where trenchless pays off around Walnut Creek
Trenchless earns its premium where digging is the expensive part:
- Long laterals on hillside lots in Lafayette, Orinda and the Walnut Creek hills, where a trench means terracing or retaining-wall repairs
- Lines under driveways, stamped concrete, pavers or patios
- Routes under mature oaks and landscaping, where most cities require permits to remove protected trees
- The street section of the lateral, where a smaller pit can reduce paving restoration
When trenchless won't work
| # | Finding | Why it matters | Typical answer |
|---|---|---|---|
| N-01 | Collapsed section | Nothing can pass to pull or place new pipe | Dig Excavate at the collapse, then decide on the rest |
| N-02 | Long belly (sag) | Bursting and lining both keep the bad slope | Replace Open trench to regrade |
| N-03 | Several sharp bends | Bursting heads and liners struggle through tight fittings | Mixed Pits at the bends or a hybrid approach |
| N-04 | Severe offset joint | May block the bursting head or wrinkle a liner | Assess Spot excavation first |
| N-05 | Pipe in sound shape with cracks and roots | Good candidate | Trenchless Lining or bursting |
Central San steps for trenchless work
- Camera inspection (pre-TV)Required before Central San issues a pipe-burst repair permit (Central San).
- PermitAny sewer work outside the building needs a Central San permit; repair permits go to a plumber or an “A” licensed contractor.
- Street work by a registered contractorWork in the public right-of-way or a Central San easement requires a licensed contractor registered with Central San (Permit FAQs).
- InspectionsCall the Central San inspection hotline, (925) 229-7373, at least 24 hours before each inspection.
- Cleanout and OPDExpect a cleanout within 2 feet of the foundation and an overflow protection device if the home lacks them.
Full detail in the Central San lateral guide.
Not sure your line qualifies? Send the camera video or ask for an inspection.
Next steps
If you don't have recent footage, start with a camera inspection. If you do, compare costs and line up quotes with the contractor checklist.
Questions homeowners ask
Is trenchless sewer repair worth it?
It often is when the lateral runs under a driveway, patio, mature trees or a hillside, because restoration is where open-trench jobs get expensive. It is not worth forcing when the pipe is collapsed or has a long belly: bursting follows the old path, and lining follows the old shape, so neither corrects a bad slope.
What are the downsides of pipe lining?
A liner slightly reduces the inside diameter, needs a pipe that still holds its shape, and can't fix a sag. Root-damaged pipe must be cleaned thoroughly first. Ask for the liner product's warranty in writing. More in lining vs. bursting.
How much is trenchless sewer replacement?
Bay Area guides quote $60–$200+ per foot for pipe bursting and $80–$250+ per foot for lining, before permits and the overflow device (Next Level Plumbing). See the cost guide.
Does Central San allow pipe bursting?
Yes, with a permit. Central San states that “to obtain a pipe burst repair permit, a pre-installation TV inspection (pre-tv) is required” (Central San).
Sources
- Central San: Sewer Repairs (permits, cleanouts, OPDs, inspections)
- Next Level Plumbing: Sewer Lateral Replacement Cost, 2026 Bay Area Guide
- HomeGuide: Sewer Line Replacement Cost (updated December 2025)
- Central San: Permit FAQs
Rules and programs change. Confirm current requirements with the agency before you start work.