Slab Leak Repair Cost: What You'll Pay for the Pipe and the Water Damage
The plumbing repair on a slab leak averages about $2,500, with most homeowners paying $1,000–$4,000, according to Fixr's 2025 cost guide. Rerouting or replacing under-slab lines costs more, about $4,000–$15,000. But that's only half the bill. The water that escaped usually needs extraction, drying and new flooring, and that restoration work is priced separately.
This guide breaks down the cost to fix a slab leak in two parts: the plumber's side (finding and fixing the pipe) and the restoration side (drying and repairing the house). All figures below are typical ranges from national cost guides (Fixr 2025, HomeAdvisor 2025); East Valley quotes vary.
Slab leak repair cost at a glance
| Item | Typical range | Who does it |
|---|---|---|
| Slab leak detection | $100–$400 | Plumber |
| Slab leak repair (plumbing), overall | Avg $2,500; typical $1,000–$4,000 | Plumber |
| Break-and-repair through the slab | $500–$3,000 | Plumber |
| Reroute or replace under-slab lines | $4,000–$15,000 | Plumber |
| Water damage restoration, whole job | $1,200–$5,000 (Fixr avg ≈ $3,000) | Restoration company |
| Clean-water extraction | $3.75–$4.25 per sq ft | Restoration company |
| Mold remediation, if it has started | $1,500–$4,000 | Restoration company |
| Labor / after-hours call-out | $70–$200/hr; $50–$200 | Either |
Step one: finding the leak ($100–$400)
Before anyone can price the repair, a plumber has to find the break. Leak detection typically costs $100–$400 and usually involves isolating hot and cold lines, pressure testing, and listening or thermal equipment to pinpoint the spot under the floor. Ask for the result in writing. That report helps you compare repair options and is useful for an insurance claim.
Not sure you have one? Our guide to the signs of a slab leak includes a meter test you can do yourself first.
Step two: spot repair vs. reroute vs. repipe
Once the leak is found, the plumber will usually offer one of three approaches. The right one depends on where the leak is, the age and condition of the pipe, and whether this is the first leak or the third.
Spot repair through the slab
The plumber cuts through the floor and concrete at the leak, repairs the section of pipe and patches the slab. Breaking and repairing the slab itself runs about $500–$3,000. It fixes one leak but leaves the rest of the old pipe in place, and the floor covering above the cut has to be replaced.
Reroute the line
The plumber abandons the leaking line under the slab and runs a new one through walls or the attic. Fixr puts rerouting at $4,000–$15,000 depending on how far the line runs. It avoids jackhammering the floor and takes that line out from under the slab for good.
Repipe
Replacing the under-slab plumbing, or the whole supply system, falls in the same $4,000–$15,000 range, and larger homes can reach the top of it. It makes most sense when a house has had repeated leaks or the pipe is badly corroded.
A single spot repair is cheapest up front. If a home is on its second or third slab leak, many owners find a reroute or repipe costs less over time than repeated floor demolition and restoration. Ask the plumber to explain why they recommend one approach over another.
Step three: the restoration bill on top
This is the part many cost guides leave out. Water from a slab leak soaks the slab, carpet pad, tack strip, baseboards and the bottom of drywall. Removing and drying all of that is a restoration job, priced on its own.
- Extraction and drying. Clean water from a supply line is Category 1, typically $3.75–$4.25 per sq ft to extract. If the water sat long enough to degrade, it can be priced as gray water at $4.10–$6.50 per sq ft.
- Class of loss. Fixr prices by how far the water spread: Class 1 (a small area) $150–$400, Class 2 (a whole room, wicking into walls) $500–$1,000, Class 3 $1,000–$3,000. Concrete holds water, so slab losses often need longer drying.
- Tear-out and rebuild. Wet drywall replacement and new flooring can add significantly. Treat any per-sq-ft flooring figure as an estimate; tile, carpet and wood vary widely.
- Mold. If the leak ran long enough for mold to grow, remediation adds $1,500–$4,000.
Put together, a typical restoration job runs $1,200–$5,000, with Fixr's average near $3,000 and HomeAdvisor's at $3,833 (most pay $1,364–$6,301). Our water damage restoration cost guide for Chandler has a calculator to estimate your wet area.
Example: one leak, two bills. A hot-water line fails under a hallway and wets the carpet in two bedrooms. Detection is $100–$400. A spot repair might land around $1,000–$4,000 including the slab work. Drying the two rooms might fall in the Class 2 range or above, plus pad, baseboard and flooring replacement. These are planning figures, not quotes; your contractors will price by line item.
What drives the cost up or down
- Location of the leak. Under a kitchen island or tile shower costs more to access than under a closet.
- Flooring type. Tile set on the slab is harder to match and replace than carpet.
- How long it leaked. Faster discovery means less wet material and lower odds of mold.
- Hot vs. cold line. Hot-line leaks often show sooner as a warm floor.
- After-hours calls. Emergency call-outs can add $50–$200, and labor runs $70–$200 an hour.
- Asbestos testing. Older Mesa and Tempe homes may need an asbestos survey before tear-out on some jobs, such as rentals.
Will insurance help?
Often with the water damage, rarely with the pipe. Many policies cover sudden, accidental water damage and sometimes the cost of breaking into the slab, but not the repair of the failed pipe itself. Your policy's deductible applies. Read does homeowners insurance cover slab leaks in Arizona before you file.
Getting fair quotes
Get the plumbing and the restoration quoted separately, so you can see what each part costs. Make sure any contractor doing tear-out or rebuild shows "ROC" and a license number on the bid, and check it at the Arizona Registrar of Contractors. Chandler Water Damage Pros connects you with independent, ROC-licensed restoration companies for the drying and flooring work. Learn how the two trades split the job on the slab leak water damage page, or request free quotes.
Frequently asked questions
How much does it cost to fix a slab leak?
Fixr's 2025 figures put the plumbing repair at about $2,500 on average, with most jobs between $1,000 and $4,000. Leak detection adds $100 to $400. Rerouting or replacing under-slab lines runs $4,000 to $15,000. Water damage restoration is a separate bill, typically $1,200 to $5,000, depending on how much flooring and drywall got wet.
Is it cheaper to reroute or repair a slab leak?
A single spot repair through the slab is usually cheaper up front, but it requires breaking the floor and leaves the old pipe in place. A reroute costs more, about $4,000 to $15,000, but avoids demolition and removes that line from under the slab. For homes with repeat leaks, a reroute or repipe often makes more sense.
Does slab leak repair cost include fixing the floor?
Usually not fully. The plumber's price may include patching the concrete, but replacing the tile, carpet or wood above it, removing wet baseboards and drywall, and drying the slab are typically priced by a restoration company or flooring contractor. Ask each quote to list exactly what is and isn't included.