BEST How Much Does It Cost to Fix a Leak Under a Concrete Slab

What Is a Slab Leak and How Serious Is It?

A slab leak occurs when a pipe under your concrete slab foundation breaks or leaks, potentially causing significant water damage to your home. Ignoring a slab leak can lead to higher water and energy bills, water damage to flooring and walls, and even mold growth. You may notice soggy floors, higher utility bills, or low water pressure—signs of a leak beneath your slab.

How Much Does It Cost to Fix a Slab Leak?

Repair costs for a slab leak can vary significantly. For smaller, less complicated repairs, you might pay between $2,500 and $3,500. However, more extensive repairs—such as rerouting pipes through your attic or walls—can cost anywhere from $3,500 to $4,600 or more. Factors such as pipe length, ease of access, and pipe material (copper, PVC, PEX) all influence the final price.

Will Insurance Cover a Slab Leak?

Unfortunately, most homeowners insurance policies won’t cover the repair of a slab leak. Insurance companies often view slab leaks as the result of preventive maintenance issues, so they won’t cover the repair. However, they may cover damage caused by the leak, including flooding and mold growth. It’s important to check your insurance policy for specific coverage details.

How Are Slab Leaks Repaired?

Repairing a slab leak typically involves one of two approaches:

1. Push-Through Method: If the leak is localized, a smaller pipe (often PEX) can be pushed through the existing pipe, leaving the old pipe as a sleeve. This method is quicker and less expensive.
2. Pipe Rerouting: For larger leaks, the damaged pipe may be abandoned entirely, and a new line is installed through the walls or attic. While this approach can be more expensive, it is often the best solution for leaks that affect a large portion of your plumbing.

Ignoring a slab leak can lead to escalating costs, so it’s important to address the issue quickly to prevent further damage.

What Happens If You Don't Fix A Slab Leak?

If you do not fix a slab leak, the damage usually gets worse, faster than most homeowners expect.

• Water damage spreads: Moisture can soak into flooring, drywall, and baseboards, leading to warping, staining, and costly repairs.
• Mold risk increases: Hidden damp areas create ideal conditions for mold growth, which can degrade indoor air quality.
• Bills keep climbing: Even a small leak can drive up your water bill and, in some cases, your energy costs.
• Foundation problems can develop: Ongoing water under the slab can erode soil and contribute to shifting, cracks, or uneven floors.
• Repairs become more expensive: The longer you wait, the more likely you will need larger plumbing work and more extensive restoration.

If you suspect a slab leak, addressing it early can help limit damage and keep repair costs under control.