If you're house-hunting in North Texas, the most expensive surprise you can run into has nothing to do with the kitchen, the roof, or even the school zone. It's hiding under the slab.
Our clay soil swells in wet seasons and shrinks in dry ones, and DFW has been swinging hard between both for years now. Every concrete slab in Plano, Frisco, McKinney, Allen, Prosper, and Celina is sitting on top of that movement. Some shift gracefully. Some don't.
A recent piece in CandysDirt walked through three of the most reliable warning signs that a North Texas foundation is in trouble. The list is short, but if you know what you're looking at on a Saturday showing, you can save yourself a five-figure correction before you ever write an offer.
What to look for outside
The first sign is also the easiest to spot from the driveway: how much concrete is showing above the dirt line?
If the slab and the soil are practically touching, that's a problem. You want 4 to 6 inches of bare concrete visible between the top of the soil and the house. When soil creeps up that high, three bad things start happening at once. Moisture has nowhere to go but down and into the foundation. Wood-destroying insects suddenly have a freeway right up to the framing. And hydrostatic pressure starts pushing against the slab from underneath, which slowly breaks down the concrete itself.
You'll see this most often on homes where the landscaping was added later or the flowerbeds have been topped off year after year. In my view, this is the single fastest thing a buyer can audit in 30 seconds, and it's also one of the easiest fixes on the seller side if you're listing soon.
What to look for in the concrete itself
The second sign is called honeycombing, and it's a clue about how the foundation was built in the first place. When concrete is poured incorrectly (too dry, not vibrated enough, or with the wrong sand-to-cement mix), air pockets get trapped and the cured surface ends up looking like a sponge.
You'll usually catch it where the foundation meets the brick line or wherever a sliver of slab is exposed. If a section of the foundation looks pitted, pebbly, or like little caves are showing in the concrete, that's not weathering. That's a structural flag that the slab may not have the strength it was designed to have.
Honeycombing isn't always a deal-killer. Sometimes the affected area is small and cosmetic. But if I were the buyer, I'd want a structural engineer to put eyes on it before we got to the option period deadline.
What to look for inside
The third sign is the one that almost everyone notices but very few people interpret correctly: doors that don't behave.
A door that suddenly won't latch, swings open or closed on its own when you let go of the handle, or has a fresh-looking gap above one corner of the frame is telling you something is moving. Houses are designed to be plumb and square. When the slab shifts, the framing twists with it, and the doors are usually the first thing to give you a visible signal.
One door doing something weird could be a hinge, a swollen jamb, or settled trim. Multiple doors in different rooms, all behaving badly at the same time, is a foundation conversation. Cracks in the drywall above door corners, sticky windows, and visible separation between the crown molding and the ceiling are the same story.
Who you actually want to call
Here is the part of the advice I think gets overlooked most often. If you suspect a foundation problem, do not call a foundation repair company first.
Call a structural engineer. The engineer has no incentive to sell you piers. They charge a flat fee, write a report, and tell you what is actually happening with the slab. That report is also the document a buyer's lender will trust if you're trying to close on a home with prior repairs. A repair contractor, by contrast, is in the business of installing piers, so the recommendation almost always involves installing piers.
I'd tell any DFW buyer who's seen one of these three signs on a showing to make the structural engineer report a written condition of the option period. I'd tell any DFW seller listing this year to do the engineer's walkthrough before you go on market. A clean engineer's letter on file is a small marketing cost that can prevent a renegotiation over a $15,000 to $40,000 number you weren't planning for.
The DFW-specific math
The reason this matters more here than in most other metros is the soil. Pier corrections in North Texas commonly run 8 to 20 piers per home, and pricing varies by contractor and access. A starter conversation with a structural engineer is usually a few hundred dollars. The asymmetry between those two numbers is enormous.
For a hypothetical Plano seller who bought in 2018 for $480K and is targeting a $720K list price in 2026, finding a sticking door three weeks before listing is not a crisis. It's a chance to either resolve the issue calmly or price the home with the disclosure already in hand. Finding it during a buyer's option period, when emotions are high and the calendar is tight, is a very different conversation.
What I'd do next
If you're buying: walk the perimeter at every showing. Look for the soil-to-concrete gap. Open and close every interior door slowly. Look up at the drywall above the door frames.
If you're selling this year: have a structural engineer give you a written assessment now, while you still have time to act on it without buyer pressure.
If you're not sure where you stand, I'm happy to walk a home with you and flag what an inspector is likely to call out. Foundation conversations are far less stressful before there's a contract on the table.
Source: Signs Your Foundation Might Be in Trouble in North Texas — CandysDirt, June 2026 · by Brenda Masse
“Multiple doors in different rooms, all behaving badly at the same time, is a foundation conversation.”
