Compare the cost of the three ways plumbers fix a leak under a concrete slab, plus detection and mold remediation if you need them.
Last reviewed October 2026 · How we calculate estimates
A slab leak is a leak in a water line running under your home's concrete foundation. Warning signs include a water bill that jumps for no reason, the sound of running water when everything is off, warm spots on the floor, or a water meter that keeps moving with every fixture shut. The repair method matters more than anything else to the final price.
| Cost breakdown | Range |
|---|
| Item | Typical cost |
|---|---|
| Leak detection / foundation inspection | $300 – $750 |
| Epoxy pipe lining | $500 – $3,500 |
| Direct access (jackhammer and replace) | $700 – $5,000 |
| Rerouting the line | $3,900 – $7,500 |
| Mold remediation | $1,500 – $6,000 |
Source: HomeGuide, 2026 pricing data.
If your home has had several slab leaks, a whole-house repipe may cost less over time. See the repipe cost calculator.
A homeowner notices a warm spot on the kitchen tile. With leak detection and a direct-access repair, the calculator shows $1,000 – $5,750 nationally, or $1,110 – $6,370 in California. Rerouting the line instead would cost about $4,200 – $8,250 nationally.
Homeowners insurance may cover slab leak repairs when a covered event caused the leak, such as an earthquake, frozen pipes or a falling tree. Policies often don't cover the pipe itself when it failed from age or corrosion, but they may cover the resulting water damage and the cost to break and restore the floor. Read your policy and call your insurer before work starts.
Common signs of a slab leak include a water bill that jumps for no reason, the sound of running water when everything is off, warm or damp spots on the floor, low water pressure and a water heater that runs constantly. To check, turn off all water use, note your water meter reading, and check again after an hour. If it moved, water is going somewhere. Our guide to slab leak signs and what to do next explains how to narrow it down to the hot or cold line.
If your home has had more than one slab leak, the pipes under the slab are likely to keep failing. In that case, rerouting the affected line or repiping the whole house overhead can cost less over time than repeated jackhammer repairs. Compare the numbers with the repipe cost calculator and our PEX vs. copper guide.
The repair method selects a published installed price range, and leak detection and mold remediation are added if you check them. The total is adjusted by your state's BEA Regional Price Parity if you choose a state. See our methodology.
Slab leak repair typically costs $700 to $5,000 using direct access, $500 to $3,500 with epoxy lining, or $3,900 to $7,500 to reroute the line. Leak detection adds about $300 to $750.
Professional slab leak detection and foundation inspection typically costs $300 to $750.
Direct repair is usually cheaper for a single leak in a sound pipe. Rerouting costs more but is often the better choice if the pipe has leaked before or is corroded, because it removes the line from under the slab.
Sometimes. Coverage usually depends on the cause. Leaks caused by a covered event are more likely to be covered, while pipes that failed from age often aren't, though resulting water damage may be.