A slab leak is a leak in a water line that runs under or inside a concrete slab foundation. You usually notice it as a higher water bill, a warm spot on the floor or the sound of running water when nothing is on. Once it is found, the next question is how to fix it, and the price depends a lot on the method.
Most slab leaks cost about $1,000 to $4,000 to fix with a spot repair, or about $1,500 to $5,000 to reroute the line. A whole-house repipe costs about $2.70 to $4.00 per square foot with PEX. To price a full repipe for your home, use our house repiping cost calculator.
Slab leak repair cost by method
There are three main ways to fix a slab leak. Each one solves a different problem, so the cheapest quote is not always the best value.
| Method | What it is | Approx. cost | Best for |
|---|---|---|---|
| Spot repair | Cut through the slab at the leak, fix the pipe, patch the concrete | $1,000 to $4,000 | One leak, easy access, pipes otherwise in good shape |
| Reroute | Run a new line through walls or the attic and abandon the old one | $1,500 to $5,000 | Leak under cabinets or costly floors, or a line that leaked before |
| Whole-house repipe | Replace all supply lines in the home | $2.70 to $4.00 per sq ft (PEX) | Repeat leaks, old copper or polybutylene pipe |
| Epoxy pipe lining | Coat the inside of the pipe to seal small leaks | Varies, often priced by line | Small pinhole leaks where the company offers it |
These are typical national estimates. Prices run higher in big metro areas and lower in small towns, and the specific job can move the number a lot.
What you pay before the repair: finding the leak
Before anyone cuts concrete, the leak has to be found. A leak detection visit usually costs about $150 to $600. A technician pressure tests each line, then pinpoints the spot with acoustic listening gear and a thermal camera.
This step saves money. Without it, a plumber may open the floor in the wrong place and have to cut again. A good detection report also shows which line is leaking (hot or cold) and gives your insurer proof of the cause. If you need to hire someone for this step, read a guide on how to choose a leak detection company before you book, so you know which tools and reports to ask for.
Hidden costs that add to the bill
The repair price usually covers the plumbing and the concrete patch. Several other costs often show up later, so ask about them up front.
- Flooring: tile, hardwood or vinyl over the repair spot has to be replaced. Matching old tile can be hard, so keep spares if you have them.
- Drywall: a reroute or repipe opens walls. Patching and painting runs about $1.60 to $3.00 per square foot of home in our repipe estimates, or more with texture.
- Water damage: wet baseboards, carpet pad or drywall need drying fast. Our guide on what to do after water damage explains the first steps.
- Permit: reroutes and repipes often need one, about $100 to $800 depending on the city.
- Moving furniture and cabinets: some crews charge extra to pull a vanity or kitchen cabinet.
Spot repair vs reroute: how to choose
Pick a spot repair when the leak is in an open area, the pipe is otherwise healthy and it is the first leak on that line. Pick a reroute when breaking the slab would mean tearing out costly flooring or cabinets, or when the same line has already leaked.
| Question | Leans spot repair | Leans reroute |
|---|---|---|
| Where is the leak? | Open floor, garage, carpeted room | Under a tub, island or stone tile |
| First leak on this line? | Yes | No, it leaked before |
| Pipe condition | Good, tests show one weak spot | Thin or corroded in several spots |
| Flooring | Carpet or easy-to-match tile | Hardwood, stone or discontinued tile |
Ask the company to show you pressure test results for the rest of the line. If one section of copper has a pinhole, others nearby may be close behind.
When a full repipe makes more sense
If your home has had two or more slab leaks in a few years, repeat spot repairs can cost more than replacing the system. Older copper with pinhole leaks and polybutylene pipe are the most common reasons people repipe.
| Home size | PEX repipe (approx.) | Copper repipe (approx.) |
|---|---|---|
| 1,000 sq ft | $2,700 to $4,000 | $6,500 to $12,000 |
| 1,500 sq ft | $4,050 to $6,000 | $9,750 to $18,000 |
| 2,000 sq ft | $5,400 to $8,000 | $13,000 to $24,000 |
Those figures are for the pipe work only. Add drywall repair and the permit. Our guides on signs you need to repipe your house and PEX vs copper pipe help you decide whether it is time.
Does insurance cover slab leak repair?
Many homeowners policies cover the cost to reach the pipe (breaking and patching the slab) and the water damage from a sudden leak. Most do not pay to fix the pipe itself, and some cap slab leak coverage at a set dollar amount. Slow leaks that went on for months may be denied as wear and tear.
- Stop the damage: shut off the main water valve if water is spreading.
- Take photos and video before anything is moved.
- Get a written leak detection report.
- Call your insurer before the repair starts.
- Keep every invoice and the final test results.
How to get a fair slab leak repair quote
Ask each company for the same details so you can compare quotes line by line: the repair method, where they will open the floor or walls, what the price includes (concrete, drywall, flooring, permit), how they will test the repair and what warranty they give on the work.
- Get the leak found and marked before you collect repair quotes.
- Get at least two quotes, ideally one spot repair and one reroute.
- Ask whether the price changes if they find a second leak.
- Price a full repipe in the house repiping cost calculator so you can compare long-term costs.
Frequently asked questions
How much does it cost to fix a slab leak?
Most slab leaks cost about $1,000 to $4,000 to fix with a spot repair through the floor, including the concrete patch. Rerouting the line through walls or the attic usually costs about $1,500 to $5,000. Finding the leak first costs about $150 to $600, and flooring repair is extra.
Is it cheaper to reroute or repair a slab leak?
A single spot repair is often cheaper for one leak in an easy spot. A reroute can cost less overall when the leak is under cabinets, a tub or costly flooring, or when the same line has leaked before.
Does homeowners insurance pay for slab leak repair?
Many policies pay to access the pipe and repair the water damage from a sudden slab leak, but not to fix the pipe itself. Some policies cap slab leak coverage. Read your policy and call your agent before work starts.
How long does slab leak repair take?
A spot repair usually takes one day. A reroute takes one to two days. A whole-house repipe usually takes two to five days, plus drywall repair.
When should I repipe instead of fixing a slab leak?
Consider a repipe when you have had two or more leaks in a few years, the pipes are old copper or polybutylene, or tests show many weak spots. At that point, paying for repeat repairs can cost more than replacing the system.
Costs are 2026 national estimates for planning only. Your price depends on your home, your area and the contractor. See how we estimate.