Slab Leak Repair in Frisco

James Armstrong Plumbing repairs slab leaks in Frisco, TX. Master Plumber James Armstrong holds Texas License M-39428.

We locate the leak with electronic and acoustic equipment before anything is opened, and in Frisco we do one thing more than that: we confirm what kind of foundation you have first. Most Frisco homes sit on post-tension slabs, and on those, cutting concrete without locating the tension cables is not a repair decision. It is a structural risk. Detection runs $300 to $500 and you get a flat written quote before any work begins.

Our shop is at 844 Dalworth Dr in Mesquite, about 50 minutes from Frisco. That is a real drive and we are not going to pretend otherwise, so we book Frisco slab leak work as scheduled appointments with a set arrival window rather than emergency dispatch.

If water is actively running right now, shut off your main and call a plumber based closer to you.

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Why Frisco Homeowners Choose James Armstrong Plumbing

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Afterhours emergency calls accepted. Call (214) 918-6109.

Why Frisco Slab Leaks Are Different

Two things about Frisco change how this job gets done, and both come from when the city was built.

Almost everything here sits on a post-tension slab

Post-tension foundations became the standard for new North Texas construction from the 1980s onward, because they handle Blackland Prairie clay movement better than rebar-reinforced slabs do.

Instead of rebar, high-strength steel cables called tendons run through the concrete in a grid and get tensioned after the pour, holding the whole slab in compression. Each tendon carries roughly 33,000 pounds of force.

Frisco’s growth happened almost entirely inside that era. So when someone quotes you a slab leak repair here, the first question is not where the leak is. It is what is running through the concrete between you and it.

And Frisco's plumbing is just now reaching the age where this starts

The earliest large developments date to roughly 2000 through 2005, which puts them at twenty to twenty-five years old.

That is right about when copper embedded in a slab has been through enough wet-dry clay cycles to show real fatigue. Frisco is not an old-plumbing city yet. It is a city whose first generation of slab leaks is arriving now.

Never Cut a Post-Tension Slab Without Locating the Cables

This is the part worth reading twice.

A standard slab leak spot repair means cutting through the concrete directly over the leak. On a post-tension slab, doing that without knowing where the tendons run risks severing one. A cable under 33,000 pounds of tension that gets cut does not simply go slack. It can crack the slab, compromise the foundation, and in the worst case whip through the concrete with enough force to injure whoever is standing there.

So on a Frisco job, the sequence is:

  1. Confirm the foundation type before any repair method is discussed.
  2. Locate the leak electronically and acoustically.
  3. Scan for tendons with a cable locator or ground penetrating radar if cutting is even being considered.
  4. Then choose the method, which on a post-tension slab is frequently not cutting at all.

 

If a plumber quotes you a jackhammer price over the phone for a Frisco house without asking about your foundation, that tells you something.

Permits, Registration, and Who Is Actually on Your Job

Frisco is stricter than its neighbors here, and homeowners benefit from knowing it.

Every contractor working in Frisco must be registered with Building Inspections before a permit will be issued. Registration requires an application, a fee, a Texas driver’s license, a valid trade license verified through the Texas State Board of Plumbing Examiners, and proof of liability insurance. Registered contractors are issued an R-Number.

Frisco also requires a licensed journeyman on site at all times while plumbing work is in progress. Violating that can revoke a contractor’s registration to do business in the city. Not every company sending a truck to Frisco meets that standard.

You can check this yourself. Frisco’s eTRAKiT system lets anyone look up currently registered contractors authorized to work in the city. Before you let anyone open concrete in your house, that is worth two minutes.

Permit applications go through the city’s Plans and Permits portal, and as of August 1, 2026 Frisco applies a 6 percent technology fee to all permits under Ordinance 2026-05-40. Requirements change, so confirm what your specific project needs with Frisco Building Inspections at 972-292-5301. This is general information, not legal advice.

How to Tell If You Have a Post-Tension Slab

You can usually work this out yourself in about five minutes:

  • Look for a stamp in the concrete, most often near the garage door, noting post-tension construction.
  • Check the garage wall for a placard or warning sign, common in homes from the 1980s and 1990s.
  • Look at the outside of your foundation for small circular patches spaced roughly two to four feet apart. Those are the anchor points where the cables were tensioned and sealed.
  • Check your building plans if you have them from purchase.

 

If you find any of those, tell whoever you call before they quote you.

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Meet James Armstrong

Meet the Master Plumber Serving Frisco: James Armstrong

James Armstrong has been a Mesquite-resident Master Plumber since 1995. What began as helping neighbors fix leaky faucets turned into a career — and eventually a family business, built on one simple rule: treat people right, do the job with integrity, and always stand behind your work. Today, James and his crew serve Frisco, Sachse, Garland, and the broader DFW metro from the Mesquite headquarters at 844 Dalworth Dr.

“In thirty years of plumbing across the DFW metro, including Frisco, the drain calls almost always come down to two things: tree roots in the older neighborhoods, and grease and hair buildup in the newer developments. We camera-inspect first, then choose hydro-jetting or snaking based on what we actually see — not on what gets you to the highest invoice.”

James Armstrong, Master Plumber  •  Texas License M-39428  •  Founder, James Armstrong Plumbing

 

Every job comes with the Armstrong Clean Promise — we leave your home cleaner than we found it, guaranteed. No excuses, no mess, no shortcuts. It’s the kind of commitment that’s earned us thousands of repeat customers and a reputation across the DFW metroplex for honest, reliable work.

Emergency Calls Accepted After Hours & Weekends as well.

Plumbing Emergency? We Take After-Hours & Weekend Emergency Calls. (214) 918-6109 • Most calls responded to same day.
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Your Repair Options in Frisco

MethodWhat it isWhen it fits
Overhead rerouteThe failed under-slab section is abandoned and new PEX is run through wall cavities and the attic, bypassing the slab entirelyOften the preferred answer on post-tension slabs, because no concrete gets cut. Also the answer when the leak sits under stone, wide-plank hardwood, or anything that will never match if replaced
TunnelingA tunnel is driven under the foundation from outside so the pipe is reached without breaking through the floor insidePost-tension slabs, and homes where interior finishes are the real cost. Costs more than open access, usually far less than replacing a floor
Spot repair through the slabConcrete cut or cored directly over the located leak, repair made, concrete patchedFastest and least expensive where the foundation type allows it and tendon locations are confirmed clear. Flooring above the cut has to be replaced
Full repipeSupply lines retired from the slab and rerun overheadWhere there have been two or more slab leaks already, since the rest of the line is on the same timeline

We tell you which of these actually apply to your house after detection, and we quote them side by side rather than presenting one number and calling it the answer.

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FAQ

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Have questions? We’ve got answers. Can’t find what you’re looking for? Give us a call anytime.

Our friendly team is available 24/7 to help you.

Yes, as scheduled work. Our shop is at 844 Dalworth Dr in Mesquite, about 50 minutes from Frisco, so we book Frisco slab leak jobs with a set arrival window rather than emergency dispatch. If water is actively running right now, shut off your main and call a plumber based closer to you rather than waiting on our truck.

Very likely. Post-tension foundations became standard for new North Texas construction from the 1980s onward, and Frisco's growth happened almost entirely inside that era. You can usually confirm it yourself: look for a stamp in the concrete near the garage door, a placard on the garage wall, or small circular patches spaced roughly two to four feet apart on the outside of your foundation. Those patches are the anchor points where the cables were tensioned.

Not without locating the tendons first, and often the better answer is not cutting at all. Each tendon carries roughly 33,000 pounds of tension, and severing one can crack the slab, compromise the foundation, and injure whoever is standing there. On post-tension slabs we confirm foundation type before discussing method, scan for cable locations if cutting is being considered, and frequently recommend an overhead reroute instead.

The failed section of under-slab pipe is abandoned in place and new PEX is run through wall cavities and the attic, bypassing the slab entirely. No concrete gets cut, which makes it a common answer on post-tension slabs and on homes with stone, tile, or wide-plank flooring that would never match if it had to be replaced.

Timing. Frisco's earliest large developments date to roughly 2000 through 2005, which puts them at twenty to twenty-five years old. That is about when copper embedded in a slab has been through enough Blackland Prairie clay expansion and contraction cycles to show real fatigue. Frisco's first generation of slab leaks is arriving now rather than being an old-plumbing problem.

Permit requirements depend on scope, and Frisco applies a 6 percent technology fee to all permits as of August 1, 2026 under Ordinance 2026-05-40. What is certain is that every contractor working in Frisco must be registered with Building Inspections before a permit is issued, and a licensed journeyman must be on site at all times while plumbing work is in progress. Confirm your project's requirements with Frisco Building Inspections at 972-292-5301.

Frisco's eTRAKiT system lets anyone search currently registered contractors authorized to work in the city. Registration requires a valid trade license verified through the Texas State Board of Plumbing Examiners, proof of liability insurance, and a registration fee, and registered contractors are issued an R-Number. It is worth checking before anyone opens concrete in your house.

Detection runs $300 to $500, covering electronic and acoustic location and pressure testing so the leak is marked precisely before anything is opened. Repair cost comes as a flat written quote after detection, once we know your foundation type and whether an overhead reroute, tunneling, or a spot repair is the right method for your house.

Our friendly team is available 24/7 to help you.