Slab Leak Detection in Sunnyvale: Find the Leak Before It Cracks Your Floor

Signs Your Slab Has a Hidden Leak

Slab leaks don’t announce themselves with a burst pipe spraying water across your kitchen. They’re quieter, and that’s why so many homeowners miss them for weeks.

• A spot on your tile or carpet feels warm even when the AC is running. That’s often a hot water line leaking under the slab.
• You hear faint hissing or trickling near the floor when everything in the house is off.
• Your water bill climbs 20 or 30 percent, but nothing in your routine has changed.
• A musty smell appears in one room, especially near a bathroom or utility closet.
• You notice a damp baseboard, buckled flooring, or a new hairline crack in the slab.

We had a call last year from someone whose bare feet felt warm while crossing the hallway tile each morning. A hot water line was leaking about a foot under the slab. There was no visible water anywhere, just that warm patch.

Not sure if what you’re noticing counts? That’s a fair and common question. If you’re second-guessing a warm spot or strange sound, have it checked before tearing up flooring based on a guess.

Check These Common Culprits Before You Book

Before you book anything, run through a quick gut check. Not every wet spot or high water bill points to a slab leak. We often get calls where the real problem turns out to be much simpler.

• A running toilet that never fully shuts off and quietly adds gallons a day to your bill
• A water heater drip pan overflowing onto the garage or utility room floor
• An irrigation valve stuck open somewhere in the yard
• An AC condensate line draining in the wrong place, especially during a hot Texas summer
• Pipes sweating from humidity, which can resemble a leak but aren’t leaking

The signs of a slab leak point somewhere else. You may find a warm floor with no vents nearby. You may hear running water when every faucet is off. An unexplained jump in the water bill gets our attention fastest. Most Sunnyvale homes sit on slab foundations, with supply lines beneath solid concrete. You can’t simply look under the house and check those lines yourself.

If you’re seeing only one small item from the list above, watch it for a day or two. If two or three signs appear together, that’s worth a call.

How Slab Leak Detection Works, Step by Step

Here’s what happens when we show up. There’s no guesswork or tearing up your whole yard on a hunch.

• We talk with you first about what you’ve noticed. It might be a warm floor, hissing sound, or unexplained water bill increase.
• We check your water meter and isolate the plumbing system. This confirms whether there’s a leak or another problem.
• We bring the right tools for the job. Acoustic equipment detects escaping water, while thermal imaging spots temperature changes in the slab. Testing narrows down which line is losing water.
• We pinpoint and mark a specific location on your slab, rather than saying it’s somewhere under the kitchen.
• We give you a written summary of our findings and explain what we recommend next.

We’re not cutting concrete during this visit. This is detection, not repair. The point is to know exactly where to dig before anyone starts digging.

Post-tension slabs in older Sunnyvale homes can make this work trickier. Cables inside the concrete require careful planning before any future repair cut. That’s why accurate detection matters here. Guessing wrong on a post-tension slab can cause a real problem.

Once we know where the leak is, you’re in control. You decide what happens next based on real information rather than a hunch.

What Slab Leak Detection Costs and What Drives the Price

Cost is usually the first question. Slab leak detection typically runs $200-$600. A straightforward pinpoint with a written summary usually costs $200-$375. That’s the real range, not a teaser rate. Your price within that range depends on factors we can usually identify quickly.

• Property size – scanning a small ranch house takes less time than scanning a sprawling one-story home on a large slab
• How deep the leak is and where it sits under the slab
• Access – furniture, flooring, and finished rooms over the suspected area can slow the work
• The equipment needed for the job, such as acoustic listening gear, thermal imaging, or testing

We charge a $26-$99 service call fee for the visit. That fee is credited toward your repair if you move forward with us, so you aren’t paying twice to learn what’s wrong.

That price covers the detection work and a written summary explaining the leak’s location and our recommended next step. Repairs are a separate job and priced once we know what we’re dealing with. Financing typically isn’t offered for this smaller detection visit. It’s more common for larger repairs or replacement work later.

We quote the detection job upfront, before anyone touches your slab. You won’t find surprise line items afterward.

Larger Lots, Longer Runs: Slab Leak Detection in Sunnyvale Homes

Sunnyvale isn’t built like Dallas or Plano, and that affects how we find a leak beneath your slab. Lots along FM 740 and in newer subdivisions nearby tend to be larger. That often means longer supply lines buried deeper beneath more concrete. A leak that takes twenty minutes to isolate in a tight Irving townhome may take longer here. There’s simply more slab to inspect.

We see this every week. With a larger footprint, our acoustic equipment must cover more ground before picking up a solid signal. Thermal imaging must scan a wider flooring area. The job isn’t necessarily harder – it takes patience and the right equipment to narrow down the location without guessing.

Newer Sunnyvale construction usually has PEX or copper lines beneath a single slab pour. It doesn’t have additions stacked onto earlier additions, as some older Dallas homes do. That’s good news. Fewer generations of plumbing under one roof mean fewer variables when tracking changes or listening for a telltale hiss.

Older properties on larger acreage sometimes have another water line running to a shop, barn, or guest structure. Miss that line, and you could spend hours chasing the wrong leak.

Our licensed and insured technicians ask about outbuildings before opening the equipment case. Skipping that question on a Sunnyvale property wastes everyone’s time.