Slab Leak Repair and Under-Slab Plumbing in Plano, TX
Responsible Master Plumber Bradley Earp, M-43562 · $97 diagnostic · reroutes from $1,050 per fixture drop · financing available · 15% off same-day approval
About three quarters of Collin County's rated soil is high or very high shrink-swell clay, so a leak under a Plano slab can do more than raise your water bill. We find the leak, tell you whether it's a water line or a drain, and give you a written price to repair it, reroute it or repipe.
- Licensed & Insured (TSBPE M-43562, Responsible Master Plumber Bradley Earp)
- $97 Diagnostic
- Upfront Pricing
- Certified Price Review
- ★ 4.8 on Google
Signs of a slab leak
Your water bill jumps and nobody is using more water.
The meter's leak indicator spins with every faucet off.
A warm spot on the floor (a hot-water line leaking under the slab).
The sound of running water when nothing is on.
Damp carpet, lifting wood or vinyl, or a musty smell that won't go away.
New cracks in tile or drywall, or doors that suddenly stick.
Water-line leak or drain leak?
"Slab leak" covers two different problems, and the fix and price are different:
- Water (supply) line leak: pressurized copper or other water pipe under the slab. Shows up on the meter. Fixed by a spot repair, a reroute or a repipe.
- Drain line leak: the cast iron or plastic drains under the slab. Doesn't spin the meter, but soaks the soil every time you run water. Found with a drain test and camera. Fixed by tunneling.
We test both, so you aren’t paying for the wrong repair.
Why Plano slabs see so many leaks
- Clay that moves. About 74.5% of Collin County's rated soil is high or very high shrink-swell clay (USDA soil survey data, summarized by a Plano engineering firm). Wet-dry cycles flex the slab and the pipes in it.
- Aging copper and cast iron. Plano's 1960s to early-1980s homes, from Old Towne and Briarwood to Dallas North Estates, now have 40- to 60-year-old pipe under the slab.
- Who owns what: everything on your side of the meter, including all the water and drain lines under your house, is the homeowner’s responsibility.
Plano Great Update Rebate: if your home is 30+ years old and you’re planning $20,000 or more of exterior improvements, the City may rebate up to $5,000. You must be approved by the City before any work, deposit or purchase. Ask the City whether your plumbing scope qualifies; this is a City program, not a Mastertex discount.
Three ways to fix a water-line slab leak
- Direct repair. We pinpoint the leak and open the slab (or tunnel to it) to replace the bad section. Best for a single leak in otherwise sound pipe.
- Reroute. We abandon the leaking line under the slab and run new PEX through the attic and walls to the affected fixtures. No digging under the house, and it removes that line from the slab for good. Priced per fixture drop.
- Whole-house repipe. When the under-slab copper has leaked more than once, the rest is usually on its way. Repiping everything in PEX ends the problem. See repiping.
Drain leaks under the slab
A leaking drain is repaired or replaced by tunneling under the foundation from outside. If the drains are cast iron and failing along their length, replacing the run is usually cheaper than chasing leaks. See cast iron drain replacement in Plano.
Slab leaks and your foundation
Leaking water under a slab softens and swells the clay soil the foundation rests on. If you have a foundation company coming out, have the plumbing tested first: fix the leak, then level the house. If they need the lines tested, we can camera and pressure-test them and share what we find.
Slab leak repair cost in Plano
Example (illustration only): a 1978 Plano home with a hot-water leak under the slab feeding the kitchen and one bathroom (1 kitchen sink + 1 dishwasher + 1 lavatory + 1 tub/shower = 4 drops). Reroute in PEX: 4 × $1,050 = $4,200, or $3,570 approved the same day, plus detection.
A direct spot repair through the floor is quoted after we locate the leak, because the access and repair path depend on what's under the finish.
Start with a $97 diagnostic
Every job starts with a $97 diagnostic, a camera inspection or walk-through as needed, and a written quote before work begins. We’re open Monday through Saturday and closed Sunday.
Already have another quote? Send it to us.
Certified Price Review: We’ll match or beat apples-to-apples plumbing scopes. Send us a written, itemized slab leak repair estimate from another licensed plumber. We compare scope, installation method, materials, access/excavation, warranty and diagnostics. If the work is directly comparable, we may adjust our price. Verbal or incomplete estimates may not qualify, and a review doesn’t obligate us to match. See program terms →
Financing: Larger jobs like sewer replacement and repipes can be split into monthly payments, subject to credit approval. See financing options →
Save 15% when you approve the same day. Approve your written quote the day we give it to you and we take 15% off.
Plano slab leak FAQs
How much does slab leak repair cost in Plano?
It depends on the repair. Rerouting a leaking line through the attic is $1,050 per fixture drop on a slab home. Tunneling to reach a leak or a drain is $425 per foot plus $1,150 per access hole. You save 15% if you approve the same day.
Is it better to reroute or repair a slab leak?
A first, single leak in otherwise good pipe can be repaired directly. If the line has leaked before, or the pipe is the same age as the rest of the house, a reroute takes it out from under the slab for good.
Does homeowners insurance cover slab leaks?
Many policies cover the cost to access the leak and the resulting water damage, but not the pipe itself. Check your policy; we provide the leak location report, photos and an itemized quote for your claim.
Can a slab leak damage my foundation?
Yes. Water under the slab saturates the clay, which swells and can move the foundation. Fix the leak before any foundation leveling.
Do I need a permit for slab leak repair in Plano?
Water and sewer line repairs generally need a City of Plano plumbing permit, which we pull.