Warning signs

Signs of foundation problems

Almost nobody discovers a foundation problem by looking at the foundation. They notice something odd about the house and go looking for a reason. This guide covers what those signs tend to mean, what they do not mean, and how to tell the difference between a house that has settled and one that is still moving.

The one thing that separates serious from cosmetic

If you take a single idea from this page, take this one: what matters is whether it is still moving.

Nearly every house develops cracks. Concrete shrinks as it cures, and a slab almost always shows hairline cracking in its first year or two. Framing dries and shifts. Soil under a new house compresses. All of that produces exactly the symptoms on this page — and then it stops, and the house sits happily for decades with a few cracks that never change.

Active movement looks different. A crack you filled reopens. A door that stuck slightly last August will not latch at all this August. Symptoms cluster on one side of the house rather than scattering randomly. The pattern, and the direction of travel over time, is what a professional is reading — not any single crack.

This is why dated photographs are genuinely useful, and why it is worth starting today even if you do nothing else. A photo of a crack with a coin beside it, taken now and again in six months, answers the most important question better than any amount of reading.

What homeowners notice first

Doors and windows that stick

The most common first symptom, and the most commonly dismissed. A door that latched fine for ten years and now catches at the top corner is telling you the frame is no longer square. Humidity swells doors too, which is why this sign is most informative when it persists across seasons, or when several doors on the same side of the house do it at once. More on sticking doors and windows →

Cracks in brick, mortar and drywall

Cracks are the sign people photograph and search for, and the one where width and direction carry nearly all the information. Mortar is weaker than brick, so movement in a masonry wall usually shows up as a stair-step crack following the joints. Inside, stress concentrates at the corners of door and window openings. More on what foundation cracks mean →

Floors that slope, bounce or feel wrong

Most houses are not perfectly level and older houses are often a long way from it. What contractors measure is the difference in elevation across the floor plan, and the pattern of high and low points tells them more than the total deviation does. More on uneven and sloping floors →

Gaps at trim, cabinets and countertops

Crown molding separating from the ceiling. A gap opening between backsplash and countertop. Baseboards lifting away from the floor. These appear when part of the structure moves and the finish carpentry — installed square, and rigid — does not move with it. They are useful precisely because trim was straight when it went in, so any gap is a measurement of something.

Walls that bow or lean

Rare in Texas because basements are rare, but this is the one sign on the list that genuinely warrants urgency. A wall bowing inward is carrying lateral pressure from wet soil, which is a different failure mode from settlement and can progress much faster. More on bowing basement walls →

Water where it should not be

Soil that stays wet against the foundation, a flower bed that holds water, an unexplained jump in the water bill, a warm spot on a slab floor. Water is the accelerant in nearly every foundation story, and a leaking supply or sewer line under a slab can cause movement entirely on its own. A hydrostatic plumbing test is one of the cheapest and most decisive things you can do.

Settling, sinking, heaving and shifting

These words get used interchangeably and they describe different things. Worth untangling, because the distinction changes what the repair looks like.

• Foundation settling is downward movement as soil compresses or loses volume under load. Some settlement is normal in a house's early years.
• A sinking foundation is settlement that has gone far enough to leave one part of the structure measurably lower than another. The distinction from ordinary settling is degree, not kind.
• Foundation heaving is upward movement — expansive clay taking on water and swelling, pushing part of the foundation up. A slab that is high in the middle rather than low at the edges often points here, and often to a plumbing leak wetting soil that normally stays dry.
• Foundation shifting is the loose term for any of the above, and for lateral movement as well. If a contractor uses it, it is fair to ask which of the specific ones they mean.
• House settling cracks is what most people call the drywall damage that results. The cracks are the report, not the problem.

In Texas, settling and heaving frequently happen to the same house in the same year — the perimeter drops through a drought summer and lifts again after a wet spring. That cycle is covered in more depth in our Texas foundation guide.

How to check your own house in twenty minutes

None of this substitutes for measurement, but it turns "I think something is wrong" into something a contractor can actually work with.

1. Walk the exterior slowly. Photograph every crack you find with a coin or tape beside it for scale. Note which elevation each one is on.
2. Try every exterior door and a few interior ones. Note which stick, and whether they catch at the top, the bottom, or the latch side.
3. Roll a marble in a few rooms, in both directions. You are looking for consistency, not drama.
4. Look at the trim line where the wall meets the ceiling, and where the baseboard meets the floor. Gaps that vary along a single wall are more interesting than an even gap.
5. Check the grade. Does the soil slope away from the house? Where do the downspouts discharge? Is there a bed that stays wet?
6. Write the date on all of it. This is the step people skip, and it is the one that makes the whole exercise worth doing.