National 2026 cost ranges, what drives the price, and the questions to ask before you hire.
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Last updated: October 2026 · Cost figures are national reference ranges from published industry sources, not quotes.
A slab leak is a pressurized water line leaking under your concrete foundation — common in Texas and the Southwest, where expansive clay soils shift and stress buried copper lines. Left alone it erodes soil, cracks slabs, and floods upward. Professional detection runs $150–$600 (acoustic listening, infrared, pressure testing), and total diagnose-and-repair jobs typically land between $630 and $4,400, with complex reroutes running higher.
| Scope | Typical range | Notes |
|---|---|---|
| Leak detection | $150–$600 | Acoustic equipment, infrared cameras, and line isolation — find it before anyone cuts concrete. |
| Spot repair (open the slab) | $500–$4,000 | Jackhammer through the slab directly above the leak; disruptive but direct. |
| Epoxy pipe lining (trenchless) | $800–$3,000 per line | Resin liner seals the pipe from inside — no slab demolition, not for collapsed lines. |
| Pipe rerouting (abandon + new run) | $1,500–$5,000+ | New line run through walls/attic; the long-term fix for old or repeat-leak systems. |
| Tunneling under the foundation | $3,000–$12,000+ | Dug from outside to preserve interior flooring — labor-intensive. |
| Water damage mitigation on top | $3–$4 per sq ft | Slab leaks start as Category 1 clean water (RestoreAdvisor 2026) — if caught fast. |
An unexplained water-bill spike, the sound of running water with everything off, warm spots on hard floors, damp carpet edges, or cracks appearing in walls and flooring. Any one of these warrants a detection call — slab leaks never fix themselves.
Often yes for sudden leaks — and insurers typically cover the expensive consequential damage (detection, tearing out flooring, putting the home back together) even when they won't pay for the few dollars of pipe itself. Gradual, long-running leaks are usually excluded.
One accessible leak in an otherwise sound system: spot repair. Older plumbing, corrosive soil, or a second leak within a couple of years: reroute. Ask the plumber what they'd do if it were their house.
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