How Much Does Foundation Slab Leak Repair Cost?

Kelly Weimert
Written by Kelly Weimert
Reviewed by Jeff Botelho
Updated June 15, 2022
Concrete slab foundation leak and water damage
Photo: Tim Allen / Getty Images

Highlights

  • Repairing a slab leak costs about $2,280, on average.

  • Cost factors include slab leak detection, waterline repairs, and the new slab.

  • Minor slab leaks cost around $630 to fix.

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The average slab leak repair cost is around $2,280, including the price of detecting the issue. If you only have a minor leak, you might pay as little as $630. Leaks that are difficult to reach could increase the price to $4,400 or more. Your final slab leak cost depends on its location and the price of repairing or replacing the foundation afterward.

Most of the time, your home’s foundation slab is hard at work beneath your feet, keeping your home safe and dry. But sometimes plumbing leaks can occur below your home’s concrete slab foundation. If you’re constantly dealing with wet socks and higher-than-normal water bills, something could be going on beneath the surface. Concrete slab leak repair costs can get pretty steep, so it’s important to address this problem before it leads to further damage.

How Much Does It Cost to Fix a Slab Leak?

Low-EndAverageHigh-End
$2,280$630$4,400+

The average cost of slab leak repair is around $2,280. If your leak is easily accessible, you might only need to pay about $630. A leak that’s harder to reach could bring your under-slab plumbing repair cost to $4,400 or more.

What Factors Impact a Slab Leak Repair?

Your final slab leak repair cost hinges on two major factors: the type of repair needed for the leak itself, and the repair needed for your home’s concrete slab after the leak gets fixed. You’ll also need to factor in the cost of detecting the leak, which requires time, skill, and specialized equipment. As much as you may want to, this is no time to DIY!

Slab Leak Detection Cost

Your slab leak cost includes the detection of any leak (or leaks) for an average price of $280. Most homeowners will end up paying $150 to $400 for slab leak detection.

Slab Leak Reroute Cost

Rerouting the pipes for slab leak repair costs at least $1,500 in most cases. If you have shorter pipes, this can reduce your cost to as little as $200 to $500. When the leaking pipe or water line is too worn for repairs, your plumber might recommend rerouting.

Leaking Pipe Repair

If the leaking pipe needs repairing rather than rerouting, this will typically go for about $150 to $350. But keep in mind, the cost of effective leak detection equipment and the labor cost involved if the leak is difficult to find can make your detection cost skyrocket.

It’s typically easier to determine if the leak is on a branch or the main, isolate the section, and reroute it.

Water Line Leak Repair

Repairing your water main will usually cost around $850, with most homeowners paying between $350 and $1,400. Depending on your situation, though, you could pay as little as $150 or as much as $3,000.

Repairing the Concrete Slab

Repairing your home’s concrete foundation after fixing the leaks will usually run anywhere from $1,900 to $6,750. This is a necessary slab leak cost to consider, as your plumber will need to break through the foundation in order to address any leaking pipes below the surface.

Pouring a New Concrete Slab 

If enough damage occurred during the repair process, you might need to pour a new concrete slab, which usually costs between $3,600 and $7,200—or $6 per square foot.

Water Damage

If a leak goes unnoticed for a while, it can cause serious water damage to your subfloor, plumbing, and the slab itself. Depending on the extent of the damage, repairing water damage can cost anywhere from $500 for a minor subfloor repair to $15,000 or more for new plumbing pipes. 

Accessibility

If your leak is tough for a pro to access, it will drive up costs considerably. For instance, an easy-to-reach leak might cost around $630 to fix, while a leak in a difficult location can cost as much as $4,400 or more to repair.

FAQs

Can you reduce your slab leak repair costs by fixing it yourself?

Unless you have plumber’s knowledge for fixing a slab leak and specialized equipment in your tool shed, attempting to DIY your slab leak repair isn’t a good idea. It’s simply not something that the average homeowner can take on themselves, regardless of how many successful DIY projects they’ve got under their belt. For the safest, easiest, and most cost-effective solution, find a plumber in your area to handle the repairs for you.

How long does it take to fix a slab leak?

Minor slab leaks typically only take a few hours to fix, provided the leak is in an accessible location. However, more extensive leaks or leaks in a hard-to-reach location can take threedays or more to fix, depending on the resulting damage. 

What should I consider when comparing plumbers and slab leak repair costs?

Concrete slab leak repair can cost a lot, and you shouldn’t trust just anyone for the job. After all, you want to ensure that they treat your home with care and (most importantly) don’t sell you any expensive repairs you might not need. 

Before you hire a plumber, you should look for the following:

  • Thorough testing before any demolition occurs

  • The use of specialized equipment to locate leaks, such as video cameras and electronic listening devices

  • An established and thorough track record

As with any other major home repair, it’s wise to compare quotes from top-rated plumbing professionals in your area. This will help ensure you’re getting the repair service that’s best for your home (and your wallet, too). 

According to Jeff Botelho, Angi Expert Review Board member and Massachusetts-licensed journeyman plumber, "Cutting and patching concrete floors is a trade unto itself and should be performed by an experienced professional. Don’t be afraid to ask your plumber if they plan to use a subcontractor for the concrete work or if they plan to do it themselves."

Keep in mind: Some plumbers will consider an under-slab leak an emergency, and might not be able to give a quote because so much about this kind of job is unknown until some amount of work has already been done. In this case, Botelho says, the best way to find a reliable plumber is by asking neighbors and friends for recommendations on pros they’ve used in the past. 

Will my homeowner’s insurance policy cover my slab leak cost?

Most insurance policies cover water damage done to your floors and walls, as well as your designer shoes and prized vinyl collection. However, a repair cost such as a leaking pipe is not something many policies address. Contact your insurance provider for a full run-down of what they cover. 

How can I spot a concrete slab leak before it becomes a major issue?

Add regularly inspecting your foundation to your list of #adulting tasks so you can spot any problems before they get worse. 

If you do find any issues, contact a plumber to check it out for you. Damp floors and standing water don’t always point to leaks beneath your home’s foundation. You may just need basement leak repair services to keep your stuff (and your feet) dry.

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