Slab Leak Repair Cost Calculator

Slab leak repair typically costs $2,000 to $6,000, with most repairs running $2,500 to $4,500 — a simple, accessible spot repair can be $1,500 to $2,500, while complex jobs (rerouting, repiping, or leaks under finished floors with damage restoration) can reach $6,000 to $10,000+. Leak detection alone, to locate the hidden leak, usually runs $150 to $500. The price is driven by the number of leaks, the repair method (a spot repair — jackhammering the slab — is the baseline at ~$2,000, rerouting/bypassing the line is ~$2,800, epoxy pipe lining ~$3,500, and repiping the line ~$5,000), the pipe type (a water supply line is the baseline; a hot/recirculation line is ~10% more; a drain/sewer line, deeper under the slab, ~20% more), the slab access (an open floor is easiest; a leak under cabinets or finished flooring like tile or hardwood adds cost), and the detection needed. A ~$1,500 job minimum applies. Restoring the concrete and flooring, water damage/mold remediation, and permits add on top. Enter your leak and method above for a localized estimate.

A slab leak is a leak in the water supply or drain pipes that run beneath — or embedded within — the concrete slab foundation of a home. Because the pipes are under the concrete, the leak is hidden, and water can undermine the foundation, seep up through the floor, or run continuously. Slab leaks are categorized as hot-side (a leak in the hot-water line, more common because heat and thermal expansion stress the pipe) or cold-side. The common causes are: corrosion, as older copper or galvanized pipes thin over time, especially with acidic or hard water; abrasion, where pipes rub against the concrete, rebar, or gravel as they expand and contract; foundation and soil movement, where shifting, settling, or expansive clay stresses and cracks the pipes; high water pressure that accelerates wear; poor installation or low-quality pipe; and simple age. Because they're hidden and can cause foundation damage, warped floors, mold, and sky-high water bills, slab leaks need prompt professional detection and repair — catching them early from the warning signs is what limits the damage and the cost.

First the leak is located, then one of several methods is used based on the leak's location, the pipe's condition, and access. Detection comes first: because the leak is hidden under the slab, plumbers use electronic/acoustic listening devices, pressure testing to isolate the leaking line, thermal cameras for hot-line leaks, and sometimes a video camera in drain lines — accurate detection avoids breaking the slab unnecessarily. Then the repair. A spot repair jackhammers through the slab (and flooring) at the leak to fix or replace that pipe section directly — direct but invasive, and only fixes that spot. Rerouting/bypass abandons the leaking under-slab pipe and runs a new line overhead through walls or the attic, avoiding breaking the slab (at the cost of some drywall work). Epoxy pipe lining coats the inside of the pipe to seal the leak trenchlessly, where the pipe condition allows. Repiping replaces the whole affected line — the most extensive fix, best when the pipes are old and failing with multiple leaks. Afterward, a spot repair needs the concrete and flooring restored, and any water damage remediated. The plumber recommends the method based on your specific leak, pipe age, and access.

The classic signs are the sound of running water when every fixture is off, a warm or hot spot on the floor (a giveaway of a hot-water-line leak — you may feel it barefoot), an unexplained spike in your water bill, and a noticeable drop in water pressure. You may also see moisture seeping up: damp or wet carpet, warped or buckling hardwood or laminate, loose or cracked tile, or wet spots on the floor. Over time the leak can cause cracks in floors, walls, or the foundation as soil erodes, plus mold, mildew, or a persistent musty smell. A simple test: shut off all water in the house and check the water meter — if it's still moving, water is leaking somewhere, possibly the slab. Because slab leaks worsen and can cause serious foundation, flooring, and mold damage, recognizing these signs early and calling a plumber for leak detection is what keeps a $2,400 repair from becoming a five-figure restoration. Don't ignore a warm floor or a running-water sound with the house quiet.

It's nuanced. Homeowners insurance often covers the resulting water damage from a sudden slab leak (flooring, walls, belongings), and — importantly — many policies include 'tear-out' coverage that pays to break through and access the slab and to restore the concrete and flooring afterward, since accessing the leak is part of mitigating the damage. That tear-out coverage can offset a big share of the total. What insurance typically does NOT cover is the pipe repair itself (considered a plumbing/maintenance issue) and any damage from gradual, long-term leaks, corrosion, wear, or lack of maintenance — insurers cover sudden events, not slow deterioration. Earth-movement causes are also commonly excluded. So the practical takeaway: for a sudden leak, document the damage with photos, file promptly, and check your policy specifically for water-damage and tear-out/access coverage — you'll likely pay for the actual pipe repair out of pocket, but the water damage and slab restoration may be covered. Coverage varies widely by policy and cause, so verify with your insurer rather than assuming.

It depends on the pipe's age and how many leaks you have. A spot repair (jackhammer the slab, fix that section) is the right call for a single leak in pipe that's otherwise in good shape — it's the most direct and often cheapest, but it only fixes that spot, so aging pipe elsewhere may leak later. A reroute/bypass makes sense when you want to avoid breaking the slab (difficult access, finished floors) or when running a fresh line overhead is cleaner than digging — it trades slab work for some drywall work. Epoxy lining suits situations where the pipe is intact enough to be sealed from within and you want a trenchless fix. Repiping the line (or the whole house) is the smart long-term move when the pipes are old and failing with multiple or recurring leaks — patching a corroding system one leak at a time gets expensive fast, and a repipe ends the cycle. As a rule: one leak in sound pipe → spot repair; recurring leaks in old pipe → reroute or repipe. A plumber will assess the pipe condition and recommend accordingly.

Because the leak is hidden under the concrete, finding exactly where it is takes specialized equipment and time before any repair can begin — and getting it right saves money by preventing the plumber from jackhammering the wrong spot. Detection uses electronic/acoustic listening devices to hear the leak through the slab, pressure testing to isolate which line is leaking, thermal imaging to spot a warm hot-water leak, and sometimes a video camera pushed through drain lines. It typically runs $150 to $500 (about $400 for electronic detection or $600 with a camera in this calculator). It's billed separately from the repair because it's a distinct diagnostic step, and it's worth every penny: an accurate pinpoint means a small, targeted opening in the slab instead of exploratory demolition. If a leak has already been precisely located, you can skip this cost — but for most homeowners who just notice the symptoms, professional detection is the necessary first step, and this calculator lets you include it or mark the leak as already located.

Most slab leak repairs take 1 to 3 days, depending on the method, the leak's accessibility, and any restoration. Leak detection is usually a few hours (sometimes a separate visit beforehand). A spot repair — jackhammering the slab, fixing the pipe, and backfilling — is often 1 to 2 days for the repair itself, plus additional time for the concrete to cure and the flooring (tile, hardwood) to be replaced, which can add days. A reroute/bypass typically takes 1 to 2 days plus drywall patching where walls were opened, and epoxy lining is similar. A repipe is more extensive at 2 to 3+ days (more for a whole-house repipe), plus wall restoration. The biggest time-adders are usually the restoration — concrete curing and replacing finished flooring or drywall — and any water-damage remediation, which involves drying and mold treatment. So while the core repair is often a day or two, the full process (detection + repair + slab/floor or wall restoration + any remediation) can span several days to a week, especially with a leak under finished flooring or with existing water damage.