Estimate 2026 slab leak detection and repair cost. Compare spot repair through slab, line reroute, and full repipe pricing, adjusted for your state.
Detection plus the three repair paths, priced side by side.
Estimates use 2026 average cost data adjusted for your state. Actual pricing depends on access, existing conditions, and local material costs. Always get a written quote before authorizing work.
A slab leak is a break in a water line running beneath the concrete foundation. They are most common in the slab-on-grade construction that dominates Texas, Florida, Arizona, Nevada, California, and much of the South, and they are expensive because reaching the pipe means going through the foundation — or deciding not to.
Confirming a slab leak takes electronic listening equipment, thermal imaging, and sometimes line pressure isolation, at $300 to $1,200. That step is not an upsell. A warm spot on the floor and a high water bill can also come from a failed toilet seal, an irrigation break, or a leaking water heater, and breaking concrete to find out is the worst possible sequence.
Spot repair breaks through the slab at the leak, repairs the pipe, and repours — cheapest, but on a line already failing from age or soil movement, another leak elsewhere in the same run is common. Tunneling excavates under the foundation from outside, leaving floors intact but costing more. Rerouting abandons the failed line and runs new pipe overhead through walls and attic, which usually ends the problem for that line. A full repipe abandons all under-slab supply lines permanently.
The right choice depends on pipe age, water chemistry, and whether this is the first leak or the third. Ask every contractor to quote at least two paths so you can see the tradeoff in dollars rather than in argument.
Many policies exclude the plumbing repair but cover access — breaking and restoring the concrete and flooring — plus the resulting water damage. That distinction can shift thousands of dollars. Document everything with photographs before any work begins and notify your insurer before demolition, not after.
| Approach | Typical cost | Floors disturbed | Ends the problem? |
|---|---|---|---|
| Detection only | $300–$1,200 | No | Diagnostic step |
| Spot repair through slab | $1,800–$4,500 | Yes | One leak only |
| Tunnel under slab | $3,500–$9,000 | No | One leak only |
| Reroute affected line | $1,800–$5,500 | Minimal | For that line, yes |
| Full repipe | $5,000–$16,000 | Minimal | Yes, permanently |
| Item | Range | When |
|---|---|---|
| Flooring removal and replacement | $150–$2,200 | Spot repair only, varies by material |
| Concrete cutting and repour | Included in spot repair | — |
| Water damage remediation | $1,200–$6,000+ | If the leak ran undetected |
| Mold remediation | $1,500–$9,000 | Extended undetected leaks |
| Permit | $60–$400 | Most jurisdictions |
A water bill that climbs with no change in usage, the sound of running water when everything is off, a warm or hot spot on the floor (hot water line), unexplained damp carpet or buckling flooring, low water pressure, or a foundation crack appearing suddenly. The meter test is the simplest first check: shut off every fixture and see whether the meter still moves.
Spot repair is reasonable for a single leak on relatively new piping caused by an identifiable event. If the pipe is copper over 20 years old, if this is the second leak, or if local water chemistry is aggressive, the odds of another leak in the same run are high, and a reroute usually costs less over the following five years. Get both quotes and decide on the numbers.
Coverage commonly excludes the plumbing repair itself but includes access — the cost of breaking and restoring concrete and flooring — and the resulting water damage. Terms vary substantially between policies and states, so read yours and call before work starts. Photograph and video everything beforehand.
Detection is usually a few hours. A spot repair typically takes one to two days plus concrete cure time before flooring can go back. A reroute runs one to three days. A full repipe runs three to five days. Flooring replacement afterward is a separate trade and timeline.
Yes, if left long enough. Water under a slab erodes and saturates the supporting soil, which can produce differential settlement, foundation cracking, and door and window misalignment. That is why detection speed matters — the plumbing repair is fixed in cost, but the damage grows.
Two reasons combine. Slab-on-grade construction is standard across the South and Southwest, so the pipes are under concrete in the first place. And expansive clay soils in Texas, Oklahoma, and parts of the Southeast move seasonally, stressing rigid pipe until it fails at a joint or a bend. Aggressive water chemistry accelerates it further.
Water damage compounds every minute it continues. Licensed plumbers are available 24 hours a day, including weekends and holidays.
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