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Cost guide

Slab Leak Repair Cost

Locating and repairing a water supply line leak beneath a concrete slab foundation.

Typical range
$1,500–$8,000
Most people pay
$3,500

National cost range

National range, per leak repair

$1,500 – $8,000

Most homeowners pay around $3,500. The spread is real, not hedging — the drivers below determine which end of it you land on.

Low end
$1,500
Simple access, like-for-like
Typical
$3,500
What most jobs come in at
High end
$8,000
Upgrades, difficult access, code work

What you are actually paying for

Find the row that matches your situation. Quotes that differ wildly from each other usually differ in scope, not in price.

ScenarioTypical cost
Electronic detection plus spot repair, tile floorSingle copper pinhole leak, one slab opening.$1,500–$3,500
Reroute line overhead, no slab cutAbandon the under-slab line and run new pipe through walls.$1,200–$3,000
Spot repair with hardwood floor restorationFloor repair often exceeds the plumbing cost.$2,500–$5,000
Multiple leaks, partial repipe recommendedWhen one repair will not solve a systemic problem.$4,000–$10,000
Leak at a manifold or fitting clusterMultiple pipes in one area reduce total slab cutting.$2,000–$4,500

What moves the price

In descending order of impact. These are also the questions worth asking a contractor whose quote sits outside the range above.

  1. Detection method

    Electronic leak detection costs $200 to $500 and pinpoints the leak before any concrete is cut. Skipping detection and guessing leads to multiple jackhammer openings.

  2. Repair method

    A spot repair involves cutting a small section of slab, repairing the pipe, and repouring concrete. Rerouting the line through the attic or walls avoids slab cutting but adds piping labor.

  3. Pipe material under the slab

    Copper pinhole leaks are spot-repaired. Corroded galvanized or failing polybutylene often triggers a recommendation for partial or whole-house repiping instead of a single repair.

  4. Floor covering restoration

    Tile, hardwood, or carpet over the repair area must be removed and replaced. Concrete patching is included; floor covering restoration is often not.

  5. Number of leaks

    One leak may indicate systemic failure in aging copper or polybutylene. A second leak within a year usually means repiping is more economical than repeated slab cuts.

Can you do it yourself?

Not a DIY job

Slab leak detection requires specialized equipment. Repair involves concrete cutting, pipe work under the slab, and pressure testing. This is licensed plumber work.

Permits and inspection

A plumbing permit is required. The inspection verifies the repair holds pressure and that abandoned lines are properly capped.
Run the DIY vs. pro decisionCheck a quote you already have

When this cannot wait

  • Warm spots on the floor
  • Sound of running water when all fixtures are off
  • Unexplained increase in the water bill
  • Cracks in the slab or foundation near plumbing runs
  • Mold or mildew smell from the floor

Common questions

How much does slab leak repair cost?
A single slab leak spot repair typically runs $1,500 to $3,500 including detection, concrete cutting, pipe repair, and slab patching. Floor covering restoration adds $500 to $2,000. Rerouting the line overhead may cost less than cutting tile.
Does homeowners insurance cover slab leaks?
The leak repair itself is often excluded. Damage to flooring, drywall, and personal property from the leak may be covered under the sudden and accidental provision. Gradual leaks are typically excluded. Check your policy and document everything.
How do you find a leak under a slab?
Electronic acoustic detection and thermal imaging pinpoint the leak location before cutting concrete. Cost is $200 to $500. Never authorize random jackhammering without a detection report showing the exact location.
Should I repair a slab leak or repipe?
If the pipe is copper with one pinhole on an otherwise sound line, spot repair is reasonable. If the home has polybutylene, galvanized, or multiple leaks, repiping through the attic is more economical long-term than repeated slab cuts.
Warm spot on the floor and water bill doubled — slab leak repair cost?
A warm floor spot with a spiking bill strongly suggests a hot water line leak under the slab. Detection runs $200 to $500. Spot repair runs $1,500 to $3,500. If the home has copper or polybutylene under the slab, rerouting overhead runs $2,000 to $6,000 — often cheaper than multiple slab cuts.
Hearing water running when everything is off — slab leak repair cost?
Continuous water sound with all fixtures off indicates a leak. A slab leak detection survey runs $200 to $500. Spot repair runs $1,500 to $3,500 including concrete cutting and patching. Floor covering restoration (tile, hardwood) adds $500 to $2,000.
Crack in the slab with water seeping through — repair cost?
Water through a slab crack may be a pipe leak, not the slab itself. Detection ($200 to $500) distinguishes pipe leak from groundwater. Pipe spot repair: $1,500 to $3,500. If groundwater, interior drain tile runs $5,000 to $15,000. Do not seal the crack until the source is identified.
Tile floor hot in one area from a slab leak — how urgent is repair?
A hot spot on the floor is an active hot water line leak — it is wasting water and energy every minute. Shut off the water heater and call for detection ($200 to $500). Repair runs $1,500 to $3,500. Delay of one month can add $50 to $150 in water and gas charges plus floor damage.
Insurance adjuster says slab leak is not covered — what will repair cost me?
Leak repair itself ($1,500 to $3,500) is often excluded. Damage to flooring and personal property may be covered. Detection ($200 to $500) should be documented for any claim. Rerouting the line overhead ($2,000 to $6,000) avoids future slab cuts and may be cheaper than repeated spot repairs.
Second slab leak in the same house — repipe instead of repair cost?
A second slab leak means systemic pipe failure. Rerouting supply lines through walls and attic runs $2,000 to $6,000 — cheaper than a third slab cut at $1,500 to $3,500 each plus $500 to $2,000 in floor restoration per incident.

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