Published guides mostly settle between $1,500 and $4,500 for the repair, and locating the leak beforehand adds $150 to $400. Which method gets used moves the number: breaking into the concrete at one spot is the cheapest route, a new line run overhead or through a wall is mid-range, and relining or repiping the whole house sits at the top. These are national guides rather than Long Beach quotes. The rest of the territory is mapped in our overview of leak and burst-pipe jobs, and anything else on our list is on the Harbor Lights home page.
How much does each way of fixing a slab leak cost?
One 2026 guide breaks it down like this. Electronic detection runs $150 to $400. Opening the slab for one spot repair averages $2,000 up to $4,000. A single rerouted line is $1,500 to $4,500; epoxy lining is $4,000 to $6,000. Repiping the entire house starts around four thousand dollars and can pass fifteen thousand. Other guides give similar bands and part ways at the edges.
| Method | What it involves | Guide price |
|---|---|---|
| Leak detection | Acoustic or thermal tools locate the line | $150 to $400 |
| Spot repair | Saw the slab, mend the pipe, restore the floor | $2,000-$4,000 |
| Reroute one line | Retire the buried pipe, run a replacement overhead | $1,500 to $4,500 |
| Epoxy lining | Line the pipe's interior without removing it | $4,000 to $6,000 |
| Repipe | Swap the entire supply system | from about $4,000, often well beyond $10,000 |
The figures come from a home warranty company's blog, which means the author has a stake in how people think about repair costs. We checked them against other 2026 guides, which gave overlapping ranges, including a figure near $2,280 as a national average with detection included. Read the table for scale only. The one figure that binds you is the quote someone writes after standing on your floor.
Which details make one slab leak cost double another?
Start with location. Water escaping under a bare garage floor is straightforward to reach, but one beneath tile and a built-in vanity is a different animal. Also the pipe material, how much concrete must be cut and rebuilt, whether flooring has to be torn up and replaced, and whether the plumber finds one leak or a system that is giving out in several places.
Long Beach housing matters here. Postwar homes in Lakewood sit on concrete slabs with supply lines in or under the concrete, and those are the houses where slab leaks come up. The older bungalows near Belmont Shore and Bixby Knolls, built mostly on raised foundations, tend to have their pipes under the floor in a crawl space instead, which makes access easier and the repair cheaper. If your house has a crawl space, you may not have a slab leak at all.
Labor dominates the bill. Flooring repair, the permit that applies to some jobs, and drying wet materials all land on top. When a leak has run for a while, water damage can add more than the pipe work, as the leak detection cost page points out.
What tells a slab leak apart from a cheaper problem?
Clues include a water bill rising with no change in habits, a patch of floor warmer than the rest, a hiss when every tap is closed, a damp spot, and a water meter that keeps turning. Of these, the meter test is cleanest, and Long Beach Utilities describes the same two-hour check on its site.
Not every one of those signs means concrete. A running toilet and a dripping faucet raise bills too, and the utility lists these among common causes. Cross off the cheap suspects, and only then call in someone with detection gear. Once the leak is pinned down, repair versus repipe explains the choice that follows.
A separate warning: gas piping can lie beneath a slab as well. A rotten-egg odor means you walk outside first and phone from there. Long Beach and Signal Hill buy gas from the city's own Long Beach Energy Resources, emergency line (562) 570-2140, while Lakewood, Seal Beach and other neighbors are SoCalGas territory, 1-800-427-2200. Include 911 when the odor is heavy or somebody feels sick.
And an ordinary burst pipe, what is the price tag?
Thumbtack's April 2026 national data shows $234 to $771 for a typical burst pipe fix, from a floor of $98 to a ceiling of $1,905. Simple leaking pipes run $228 to $752. For a pinhole in half-inch copper, one California pro quoted roughly $150.
Those prices assume a reachable pipe. If the burst is behind finished drywall, add the cost of cutting, patching, texture and paint. If it is under a slab, the numbers above for a slab leak apply instead. Night calls typically carry a premium over the same repair booked on a weekday. The page on burst pipe emergencies lays out the first minutes after a rupture.
How is a leak inside a wall handled, and at what price?
It can be fixed. Someone traces the leak, cuts a modest opening, swaps the bad section or fitting, and the wall is closed again. Plumbing labor often falls near Thumbtack's $228 to $752 for a leaking pipe. Drywall work is extra, and the guides we read gave no trustworthy number for wall access, so have the quote itemize it.
Pipe type and distance to the nearest reachable point shape the price. A leaking connection, say a threaded or soldered joint, usually costs less than a split pipe because a fitting can be redone. A weeping plastic joint has its own page on PVC joint repair. Small leaks tend to grow, and the damage can outrun the repair.
Is a clamp or a temporary fix worth trying first?
On a straight, reachable pipe, a clamp or wrap can sometimes hold a small leak briefly, and keeping one in the garage is sensible. Treat it as a stopgap. Lines under pressure flex, clamps work loose, and what held overnight may weep by breakfast. Use it as a bridge until the plumber arrives.
A clamp is the wrong tool inside walls, beneath slabs, on bends and on threaded steel. Spray-on rubber such as Flex Seal is another matter: plumbing guides we read call those coatings a poor match for pressurized supply lines, and one that seems to hold can mask a pipe that is failing. The product label states what it is rated for. For a side-by-side, see leak sealants compared.
Radiator pipes and slab leak calculators: any use?
Hot-water radiator heating is uncommon in this mild climate, though some older buildings still have it. Such leaks often start at a valve or union and belong to the heating trade, so ask whoever services the boiler. As for online slab leak calculators, they mostly multiply a guess, so assemble your own estimate.
Start with the detection fee, choose a method from the table, add flooring and a permit, then leave room for surprises. That yields a range to hold up against whatever a plumber writes. A smaller leak at a household connection is a different story, and a cheaper place to start is the walkthrough on fixing a drip under the sink.
Will insurance pay for the repair?
Rarely for the pipe itself. A homeowner policy may reimburse the water damage that a sudden break causes, whereas the broken pipe and any slow seepage are frequently left out; wording varies. Read the declarations page and phone the insurer before approving work. More detail sits in our slab leak insurance article.
A hidden leak under the slab can also qualify for a partial credit on the city water bill. Long Beach Utilities allows one adjustment per account every three years for hidden or underground leaks you could not reasonably have found, with proof of repair, though faucet and toilet leaks do not qualify. Finish the repair first, then apply.
Common questions
How disruptive is the work, and for how long?
Spot repairs and reroutes commonly wrap up within a day or two. Lining or repiping stretches longer, and flooring repair plus drying come after. Where a permit applies, the city schedules the inspection, and the plumber can explain which steps your job needs.
Is a slab leak an emergency?
Urgent, yes, but a 2 a.m. emergency only if water is pooling. Close the main while waiting if the leak size is unclear. Each day it runs adds water damage and a bigger bill, and the utility is clear that the pipe past the meter belongs to you.
Does slab leak work require a city permit?
Leak stops that use no new materials are exempt in Long Beach, yet replacing or rerouting pipe means permit-and-inspection work. The person doing the job should know on which side of that line yours falls. San Pedro and Wilmington run permits through the Los Angeles building department instead.
How should I weigh competing estimates?
Compare approach alongside price. A bargain spot repair on pipe that is failing everywhere is no bargain. Ask what each bidder found, what the work covers, whether flooring is included and who handles the permit. To get one in writing, start from the quote page.
References
- Empire Home Protect, slab leak repair cost 2026 (home warranty seller, figures not independently verified)
- Thumbtack, pipe repair cost guide (updated April 2026)
- Published slab leak cost guides compared by search, November 2026
- Long Beach Utilities, high water bills and leak adjustments
- Long Beach Energy Resources (Long Beach Utilities), gas
- SoCalGas, natural gas leak safety
- City of Long Beach, plumbing permit requirements
- California Department of Insurance, residential insurance guide
Updated