Slab Leak Repair Cost Calculator

In 2026, slab leak repair typically costs $2,000 to $6,000, with most repairs running $2,500 to $4,500 — though a simple, accessible spot repair can be $1,500 to $2,500, and complex repairs (rerouting, repiping, or leaks under finished floors with damage restoration) can reach $6,000 to $10,000+. Leak detection alone (to locate the leak) usually costs $150 to $500. The cost depends mainly on the number of leaks, the repair method (a spot repair — jackhammering the slab to fix the pipe — is the baseline, rerouting/bypassing the line is a bit more, epoxy pipe lining costs more, and repiping the affected line is the most), the pipe type (a water supply line is the baseline, a hot/recirculation line a bit more, and a drain/sewer line — deeper under the slab — the most), the slab access (an accessible/open floor is easiest, while a leak under cabinets/a fixture or under finished flooring like tile/hardwood adds cost), and the leak detection needed. A slab leak is a leak in the water supply or drain pipes that run beneath (or within) the concrete slab foundation of a home. Because the pipes are under the concrete, slab leaks are harder to find and fix than typical leaks — they require leak detection (electronic acoustic/pressure equipment, sometimes a camera) to pinpoint the leak, then a repair method: a spot repair (breaking through the slab to access and fix the pipe), rerouting (abandoning the under-slab pipe and running a new line overhead through walls/attic to avoid breaking the slab), epoxy pipe lining (coating the pipe interior to seal it), or repiping the line. Slab leaks can cause significant damage (foundation issues, flooring damage, mold, high water bills) if left unaddressed, so prompt repair is important. Add-ons like restoring the concrete and flooring (after a spot repair), water damage/mold remediation, a permit, and a whole-system pressure test add to the total. Pricing varies by region, the repair method, the leak location/access, and the plumber. A simple, accessible spot repair is at the lower end, while a reroute or repipe, a leak under finished flooring, or one with water damage is at the higher end. This calculator lets you set the number of leaks, repair method, pipe type, slab access, and detection to estimate your project. Slab leaks should be repaired promptly to limit damage.

A slab leak is a leak in the water or drain pipes that run underneath (or embedded within) the concrete slab foundation of a home — caused by pipe corrosion, abrasion, shifting soil/foundation movement, poor installation, high water pressure, or age. Because the pipes are under the concrete, these leaks are hidden and can cause significant damage. What a slab leak is: in homes built on a concrete slab foundation, the water supply lines (and sometimes drain lines) often run under or within the slab. A slab leak occurs when one of these under-slab pipes develops a leak (a crack, hole, or break) — releasing water under or into the foundation. Because the leak is beneath the concrete, it's hidden (you can't see it directly) and water can undermine the foundation, seep up through the floor, or cause other damage. Slab leaks are categorized as hot-side (a leak in the hot water line — more common, as hot water/heat stresses pipes) or cold-side. What causes slab leaks: Corrosion — over time, pipes (especially older copper or galvanized steel) corrode, particularly with certain water chemistry (acidic or hard water, or electrolysis/galvanic corrosion from soil contact). Corrosion thins and eventually breaches the pipe — a leading cause, especially in older homes. Abrasion — pipes can rub against the concrete, rebar, gravel, or other pipes (from water flow vibration or thermal expansion/contraction, especially hot water lines expanding/contracting) — wearing a hole over time. Foundation/soil movement — shifting, settling, or expanding/contracting soil (expansive clay, drought/moisture cycles, earthquakes) moves the foundation and stresses/cracks the pipes under it. Ground movement is a common cause. High water pressure — excessively high water pressure stresses the pipes, accelerating wear and leaks. Poor installation / pipe quality — improperly installed pipes (kinks, dents, poor joints, contact with abrasive materials) or low-quality pipes fail sooner. Age — older pipes (and older homes) are more prone (materials degrade over decades). Hot water lines — hot-side leaks are more common (heat and thermal expansion stress the pipes). Why slab leaks matter: hidden under the slab, they can cause foundation damage (water undermining/eroding the soil, foundation movement/cracking), flooring damage (water seeping up — warped floors, damp carpet), mold (moisture), high water bills (continuous leaking), reduced water pressure, and structural issues — so they need prompt detection and repair. Signs of a slab leak: the sound of running water (with no fixtures on), a warm/hot spot on the floor (hot-line leak), unexplained high water bills, low water pressure, damp/warm flooring or carpet, cracks in the floor/walls, mold/mildew or musty smell, or a moving water meter with everything off. Considerations: slab leaks are caused by corrosion, abrasion, ground movement, pressure, installation, or age, and because they're hidden under the slab, they require professional detection and repair to limit foundation/water damage. Catching them early (from the signs) limits damage. This calculator estimates the repair cost. So a slab leak is a leak in the pipes under a home's concrete slab foundation, caused by corrosion, abrasion, soil/foundation movement, high pressure, poor installation, or age — hidden and potentially damaging, so it needs prompt detection and repair. Watch for the signs and address it quickly. Early repair limits foundation and water damage.

A slab leak is repaired by first locating it (leak detection), then using one of several methods — spot repair (accessing the pipe through the slab), rerouting/bypassing the line, epoxy pipe lining, or repiping — chosen based on the leak location, the pipe condition, the number of leaks, and access. Detection comes first, then the appropriate repair. Step 1 — Leak detection (locating it): because the leak is hidden under the slab, plumbers use leak detection equipment to pinpoint it: electronic/acoustic listening devices (to hear the leak), pressure testing (isolating lines to find the leaking one), thermal/infrared cameras (for hot-line leaks), and sometimes a video camera (in drain lines). Accurate detection is essential to repair efficiently (avoiding unnecessary slab breaking). Detection typically costs $150-$500. Repair methods: Spot repair (access through the slab) — the plumber jackhammers through the concrete slab (and any flooring) at the leak location to access and repair (or replace the section of) the leaking pipe directly. Pros: directly fixes the leak, good for a single accessible leak. Cons: invasive (breaks the slab and flooring — requiring concrete and floor restoration afterward), disruptive, and only fixes that spot (other aging pipe may leak later). Best for a single, accessible leak in otherwise good pipe. Rerouting / bypass (abandon and reroute) — instead of breaking the slab, the plumber abandons the leaking under-slab pipe and runs a new line for that section overhead (through walls, ceiling, or attic) to bypass the slab. Pros: avoids breaking the slab/floor (less foundation disruption), good when slab access is difficult or you want to avoid jackhammering. Cons: runs new pipe through walls (some drywall work), may be visible in some spots. A common alternative to spot repair. Epoxy pipe lining (trenchless coating) — an epoxy coating is applied to the inside of the pipe (via access points) to seal the leak from within, without breaking the slab. Pros: trenchless (no slab breaking), seals the pipe, less invasive. Cons: requires suitable pipe conditions, not for all situations, and a specialized process. Good where applicable to avoid digging. Repipe (replace the line) — if the pipes are old/failing (multiple leaks, widespread corrosion), repiping the affected line (or the whole house — see house repiping) replaces the bad pipe entirely, often rerouting overhead. Pros: a long-term fix (new pipes), best for old/failing systems with recurring leaks. Cons: the most extensive/expensive. Best when the pipes are at end-of-life (recurring leaks). After the repair (restoration): for spot repairs, the slab (concrete) and flooring must be restored/patched. Water damage (from the leak) may need remediation (drying, mold treatment). Choosing the method: a single accessible leak in good pipe → spot repair; difficult slab access or to avoid breaking the slab → reroute or lining; old/failing pipes with multiple leaks → repipe. The plumber recommends based on the leak, pipe condition, and access. Considerations: detection first (to locate), then the method (spot repair, reroute, lining, or repipe) based on the situation, plus restoration afterward. This calculator includes these repair methods and detection. So a slab leak is repaired by detecting/locating it, then spot-repairing (through the slab), rerouting/bypassing the line, epoxy-lining the pipe, or repiping — chosen by the leak location, pipe condition, and access, with restoration afterward. The method depends on the situation. A plumber detects and recommends the best repair. Detection plus the right method fixes it.

Common signs of a slab leak include the sound of running water (with no fixtures on), a warm or hot spot on the floor, unexplained high water bills, low water pressure, damp or warm flooring/carpet, cracks in the floor or walls, mold/mildew or musty odors, and a moving water meter when everything is off. Catching these early limits damage. Key signs of a slab leak: Sound of running water — hearing water running (a hissing, rushing, or trickling sound) when all fixtures/appliances are off — a classic sign of water leaking under the slab. High water bills — an unexplained, sudden increase in your water bill (the leak wastes water continuously) — a common indicator. Warm/hot spot on the floor — a warm or hot area on the floor (especially with a hot-water-line slab leak — the hot water warms the slab above it). Walking barefoot may reveal it. Low water pressure — a noticeable drop in water pressure (water escaping through the leak reduces pressure at fixtures). Damp, warm, or wet flooring — moisture seeping up through the floor: damp/wet carpet, warped or buckling hardwood/laminate, loose or cracked tile, or wet spots on the floor. Standing water or moisture is a strong sign. Cracks in floors or walls — the leak (and resulting foundation movement/soil erosion) can cause cracks in the floor, walls, or foundation. Mold or mildew / musty smell — moisture from the leak promotes mold/mildew growth (and musty odors), sometimes under flooring or in walls. Moving water meter — if your water meter is moving/spinning when all water is off, water is leaking somewhere (possibly the slab). You can test by shutting off all water and checking the meter. Foundation issues — over time, soil erosion/movement from the leak can cause foundation problems (settling, cracks). Pooling water outside — sometimes water surfaces around the foundation/perimeter. Reduced hot water / water heater running — a hot-side leak can make the water heater run more. Why early detection matters: slab leaks worsen over time and can cause significant damage (foundation damage, flooring damage, mold, structural issues, high bills) — so recognizing the signs early and getting it detected/repaired limits the damage and cost. If you notice these signs, have a plumber perform leak detection to confirm and locate it. Considerations: watch for running-water sounds, warm floor spots, high water bills, low pressure, damp flooring, cracks, mold/musty smells, and a moving meter — and act promptly (call a plumber for detection) if you suspect a slab leak. Early action limits damage. This calculator estimates the repair cost. So signs of a slab leak — running water sounds, warm floor spots, high water bills, low pressure, damp flooring, cracks, mold/musty odors, and a moving meter — signal a hidden under-slab leak that needs prompt detection and repair. Recognize them early and call a plumber. Quick action limits foundation and water damage. Don't ignore the warning signs.

Homeowners insurance often covers the resulting water damage from a sudden slab leak (and sometimes the cost to access/tear out the slab to reach the leak), but typically does NOT cover the pipe repair itself or damage from gradual leaks, wear, or maintenance issues — coverage varies by policy and the cause. Review your specific policy. What's often covered: Sudden/accidental water damage — if a slab leak is sudden and accidental (a covered peril), many policies cover the resulting water damage to your home (flooring, walls, belongings) — the damage the leak causes. Access/tear-out coverage — importantly, many policies include 'tear-out' coverage: the cost to break through/access the slab (jackhammering the concrete and flooring) to reach the leaking pipe — and to repair the slab/flooring afterward — may be covered (even if the pipe repair itself isn't), since accessing the leak is part of mitigating the damage. This can be a significant portion of the cost. Check your policy for tear-out/access coverage. What's typically NOT covered: The pipe repair itself — the cost to actually repair/replace the leaking pipe is usually NOT covered (it's considered a maintenance/plumbing issue, not damage). You typically pay for the pipe repair. Gradual leaks / wear and tear — damage from slow, gradual leaks, long-term seepage, corrosion, wear, age, or lack of maintenance is usually excluded (insurance covers sudden events, not gradual deterioration). If the leak was gradual/longstanding, coverage is less likely. Maintenance/negligence — damage from neglected maintenance is excluded. The pipe/foundation itself — the foundation and pipes are generally not covered for the repair (only resulting damage may be). Earth movement — if soil movement caused it, earth movement is often excluded. Coverage factors: Cause — sudden/accidental (more likely covered for damage) vs gradual/wear (less likely). Policy specifics — coverage for water damage, tear-out/access, and exclusions vary by policy (read yours). Documentation — document the leak and damage, and file promptly. Considerations: Check your policy — review your coverage for water damage, tear-out/access (a key potential coverage), and exclusions (gradual leaks, wear, earth movement). File a claim — if the leak/damage is sudden, file a claim (the resulting damage and possibly access/restoration may be covered). Pipe repair often out-of-pocket — expect to pay for the actual pipe repair, but insurance may cover the water damage and slab access/restoration. Ask your insurer — clarify what's covered for your situation. So homeowners insurance often covers the resulting water damage and may cover the slab tear-out/access and restoration, but usually not the pipe repair itself or gradual-leak damage — coverage depends on the cause (sudden vs gradual) and your policy. Check your policy and file a claim for sudden damage. The access/tear-out coverage can offset a big part of the cost. Consult your insurer for your specific coverage. Don't assume; verify with your policy.

Slab leak repair typically takes 1 to 3 days, depending on the repair method, the leak's accessibility, and any restoration — leak detection is usually a few hours, a spot repair is often 1-2 days (plus slab/floor restoration), and rerouting or repiping can take 2-3+ days. The method and access drive the timeline. Typical timeframes: Leak detection — locating the leak (electronic detection, pressure testing, camera) usually takes a few hours (sometimes a separate visit before the repair). Spot repair — jackhammering the slab, repairing the pipe, and backfilling typically takes 1-2 days for the repair itself, plus additional time for slab (concrete) and flooring restoration (the concrete needs to cure, and flooring — tile, hardwood — must be replaced, which can add days). The repair is moderate; the restoration adds time. Reroute / bypass — abandoning the under-slab pipe and running a new line overhead (through walls/attic) typically takes 1-2 days, plus drywall repair where walls were opened. Avoids slab restoration but adds wall patching. Epoxy lining — the trenchless lining process typically takes 1-2 days (depending on the pipe length/access). Repipe — repiping the affected line (or whole house) is more extensive — 2-3+ days (or more for a whole-house repipe), plus wall restoration. Factors affecting the time: Repair method — spot repair (1-2 days + restoration) vs reroute (1-2 days + drywall) vs repipe (2-3+ days). Detection — locating the leak (a few hours, possibly a separate visit). Slab access — a leak under finished flooring (tile/hardwood) or cabinets takes longer (removal and replacement); an accessible floor is quicker. Number of leaks — multiple leaks take longer (and may favor repiping). Restoration — concrete curing and flooring/drywall restoration add days (the repair vs the full restoration). Water damage remediation — if there's water damage/mold, drying and remediation add time. So while the core repair is often 1-2 days, the full process (detection + repair + slab/floor or wall restoration + any remediation) can span several days to a week, especially with finished-floor access or extensive damage. The restoration (concrete, flooring, drywall) often adds the most time beyond the repair. Plan for the restoration and any water damage work. This calculator estimates the cost; the time depends on the method and restoration. The core repair is a day or two; full restoration extends it. The access and method set the timeline.