Slab Leak Detection & Repair
in Dallas, TX
Expert, honest, and lasting repairs for homeowners across the DFW Metroplex.
If your Dallas home has a slab leak, you need a company that can find it, fix the pipe, and check whether the slab above it has moved. We are Quality Foundation and Plumbing, based in Dallas, TX, and we hold both a General Contractor license (#TL-GC-002004) and a Master Plumber license (MP-37229). A slab leak sits exactly on the line between plumbing and foundation work, and most companies are licensed for only one side. We are licensed for both, which is what makes slab leak repair in Dallas different when you call us.
Why Dallas Homes Get Slab Leaks
Most of Dallas sits on Blackland Prairie expansive clay, which swells hard when it rains and shrinks hard when it dries. That cycle stresses the slab, and it stresses the pipes running underneath it. The housing stock most at risk was built from the 1940s through the 1970s: slab-on-grade homes with cast iron drain lines and aging copper supply lines under the concrete. Neighborhoods like Lake Highlands, Lakewood, Preston Hollow, Oak Cliff, and Far North Dallas have thousands of these homes, and the pipes under them are now 50 to 80 years old.
Cast iron rusts from the inside out until it cracks or channels. Copper develops pinholes, especially in aggressive clay soil. When a pipe fails under the slab, the water saturates the clay in one concentrated spot, which causes a localized heave that lifts and cracks the concrete above it. The leak and the foundation movement arrive together, and fixing only one side means paying for the same problem twice. Learn more about cast iron drain lines and why they fail in older Dallas homes.
Signs of a Slab Leak in Your Dallas Home
- An unexplained water bill spike with no change in usage, paired with new cracks in drywall or brick
- A warm spot on the floor, which usually means a hot-water line is leaking
- The sound of running water when all fixtures are turned off
- Damp flooring, a musty smell, or unexplained moisture with no visible source
- New cracks in drywall, brick, or the slab itself, or doors that suddenly start sticking
If you are seeing plumbing-side signs without structural signs yet, that is the best time to call. You can often catch and fix the leak before the clay underneath has moved enough to crack the slab. For more on the structural warning signs, see our guide to signs of foundation problems in North Texas.
How We Find the Leak
We do not guess, and we do not break open your floor to search. Finding a slab leak in Dallas requires specialized equipment and a systematic process:
- Hydrostatic pressure test. We isolate sections of the plumbing system and pressurize them to see whether pressure holds or drops. This tells us whether there is an active leak and roughly which line it is on.
- Acoustic listening equipment. Electronic listening devices amplify the sound of water escaping under pressure, letting us narrow the leak to a specific area without opening concrete.
- Infrared thermal imaging. A thermal camera detects temperature differences in the floor surface caused by hot-water line leaks, helping confirm the location.
- Camera inspection. When useful, we feed a waterproof camera through the line to visually confirm the condition of the pipe and the exact point of failure.
This combination keeps the access opening small and targeted instead of exploratory. The detection report is also useful later for insurance questions or for showing a buyer what was done.
Dallas Slab Leak Repair Options
Once we have pinpointed the leak, we discuss the best repair method. There are three main approaches, and the right one depends on where the leak sits, what is on top of it, and how old the pipe is.
Breaking Through the Slab
We cut and jackhammer through the concrete from inside the house, dig down to the pipe, repair or replace that section, then pour the concrete back. This is the right call when the leak is shallow, close to an exterior wall, or under inexpensive flooring like carpet or tile in a utility area. It is the wrong call when there is hardwood, natural stone, or a kitchen island over the leak, because restoring that flooring can cost more than the plumbing repair itself. You also live in a construction zone for a few days: concrete dust, jackhammer noise, and rooms you cannot use.
Tunneling Under the Slab
We dig from outside the house, under the foundation, and reach the pipe from below. Your floors never get touched. Tunneling wins when the leak is deep, far from an exterior wall, or under flooring that is expensive or impossible to match. It also wins when the repair is extensive, like replacing a run of drain line rather than patching one spot. The trade-off is cost: every foot from the exterior wall to the leak is billable, so a leak in the center of a large Dallas home costs real money to reach.
Rerouting or Repiping
If the pipe itself is the problem, not just one spot in it, we abandon the section under the slab and run a new line overhead through the attic and down through interior walls. If you have had two slab leaks in three years on the same copper supply system, a third is coming. Rerouting gets the water out from under the slab permanently. Learn more about repiping and PVC pipe replacement. Note that drain and sewer lines rely on gravity and cannot go overhead, so those get tunneled or accessed through the slab.
Slab Leak Repair Cost in Dallas
Detection typically runs $150 to $600. A simple, accessible repair can be a few hundred dollars, while tunneling or a full reroute commonly runs $5,000 to $15,000. What drives your number is where the leak sits, what flooring is on top of it, and how old the pipe is. For the full breakdown of detection costs, tunneling per-foot pricing, and reroute ranges, see our slab leak repair cost guide. We give you a written estimate after detection so you know the exact number before any work begins.
Permits in the City of Dallas
Under-slab plumbing repair requires a permit and a city inspection in the City of Dallas. As a licensed general contractor, we pull the permit and schedule the required inspections ourselves. You do not have to deal with the permits office, and we do not start work until the permit is approved. Other DFW cities have their own requirements, so if your home is outside Dallas proper, ask us how permitting works for your address.
Insurance and Slab Leaks
Most Texas homeowners policies cover the sudden and accidental release of water and the tear-out needed to reach it, which often means the slab access and the resulting water damage to floors and walls. What they usually do not cover is the pipe repair itself, standalone leak detection, or anything ruled gradual wear and tear. Document everything from day one: photos, the water bill spike, the detection report. We write our reports so an adjuster can actually read them. For the full picture on Texas claims, read our guide on whether homeowners insurance covers foundation repair in Texas.
When a Slab Leak Becomes a Foundation Problem
Water escaping under the slab does not just waste water. It saturates the clay in one spot, which causes a localized heave that lifts and cracks the concrete. Or it washes out the soil supporting the slab, creating a void that the slab settles into. Either way, a plumbing problem becomes a structural one. If the slab has already moved, you may also need foundation repair in Dallas alongside the plumbing fix. We explain that chain reaction in detail in Can a slab leak ruin your foundation?
Why Dallas Homeowners Choose Quality F&P
Most foundation companies in Dallas are licensed for structural work only. When they lift a slab and find a broken cast iron line, they have to stop and tell you to find a plumber. We hold both licenses, so the plumbing test, the pipe repair, and the foundation leveling stay under one roof with one schedule and one invoice. No subcontractor handoffs, no finger-pointing about which trade caused what.
You get a written estimate after detection, so you know the exact number before any work begins. What we quote is what you pay. For slab leak detection across DFW beyond Dallas proper, we serve the entire Metroplex.
Get a Real Number for Your Dallas Home
Every figure above is a range because your house is not a range. It is a specific leak, at a specific depth, under a specific floor, in a pipe of a specific age. The only way to get a real number is to find the leak first.
Ready to Fix the Problem?
Don't let damage spread. Contact Quality Foundation and Plumbing today for a free, no-pressure inspection and estimate in the Dallas-Fort Worth area.
Frequently Asked Questions
How much does slab leak repair cost in Dallas?
Detection typically runs $150 to $600. A simple, accessible repair can be a few hundred dollars, while tunneling or a full reroute commonly runs $5,000 to $15,000. We give you a written estimate after detection so you know the exact number before any work begins.
How do you find a slab leak without breaking the floor?
We use hydrostatic pressure testing to confirm and isolate the leak, acoustic listening equipment to narrow the location, and infrared thermal imaging to pinpoint the exact spot before any concrete is opened. This keeps the access point small and targeted.
Is tunneling better than breaking the slab?
Tunneling from the exterior avoids destroying interior flooring and lets you stay in the home, but it costs more in labor. Breaking the slab is faster and often cheaper for accessible leaks but destroys the flooring above. The best method depends on the leak's exact location and what is on top of it.
Does homeowners insurance cover slab leaks in Texas?
Many policies cover the cost of accessing the leak and repairing the resulting water damage, but they often do not cover the plumbing repair itself. We document the damage thoroughly so your adjuster has what they need to evaluate the claim.
Can a slab leak damage my Dallas home's foundation?
Yes. Water escaping under the slab can erode the soil supporting your home, creating voids that cause the concrete slab to crack and sink. In Dallas's expansive clay, the wet soil can also swell and push the slab upward, causing heave.
How long does slab leak repair take?
A spot repair through the slab can often be done in one to three days. Tunneling projects typically finish in three to five business days. A full reroute or repipe may take a week or more depending on the scope.