Foundation Repair in Houston, TX

Why Houston foundations move

Most of the Houston metro sits on a thick layer of expansive clay. It's the same stuff that makes the yard turn to soup in March and split open in August. When that clay takes on water it swells, and when it dries out it shrinks, and the difference between the two states can be several inches of vertical movement at the surface. A house doesn't float above that. It rides on it.

The movement is never even. Soil under the middle of a slab stays damper than soil around the edges, because the house shades it and keeps the rain off. The side of the house with the big oak dries out faster than the side without, because the roots are pulling water all summer. The corner near the downspout that dumps onto the flowerbed stays wetter than the corner that drains to the street. One part of the foundation rises while another drops, and the house twists slightly to follow it.

That twisting is what you see as cracks. Drywall splits at the corners of doors and windows because those are the weak points in a wall. Doors stick because the frame has gone out of square. Brick veneer cracks in a stair-step pattern along the mortar joints because brick can't bend. None of it means the house was built badly. It means the house was built on Houston clay, and the clay has been doing what clay does for a few decades.

The usual suspect: a downspout dumping against the foundation, saturated clay on one corner, and the stair-step crack that follows.

An evaluation from someone who isn't paid by the pier

Most people who call us have already had a foundation repair company out. They got a diagram with dots on it, a pier count, and a price. Sometimes two companies came out and the dot counts were very different.

Repair companies aren't dishonest. Their tool is piers, and when your tool is piers every foundation looks like it needs some. We don't sell piers. We evaluate the foundation, work out why it's moving, and tell you what, if anything, to do about it. Sometimes that's piers. Often it's drainage. Sometimes it's a plumbing leak under the slab that has been softening the soil for years, and no pier job will hold until it's found. And sometimes the movement is within normal range for a Houston house of that age, and the right move is to watch it.

The evaluation covers four things:

• Elevation survey across the whole floor with a manometer or laser level, to a tenth of an inch, so we know exactly where the slab is high and low.
• Crack mapping, noting direction and width, because the direction tells you which way the foundation is going.
• Drainage, grading, trees, gutters, and plumbing, which is where the cause usually lives.
• A written report you can use however you like, including to get competing bids from repair contractors on a defined scope.

An elevation survey: readings across the whole floor, plotted on a grid, so the diagnosis is measured rather than eyeballed.

Which foundation you have changes the repair

Slab-on-grade is what most Houston houses built since the 1960s sit on. A single pad of concrete with beams formed into the underside, poured directly on the prepared soil. When it moves, the whole slab tilts or bows, and the repair is usually to lift the low side back onto piers driven to a stable depth and hold it there.

Pier and beam is the older system, common inside the Loop and in the pre-war neighborhoods. Wood beams sit on concrete or masonry piers over a crawlspace. These move differently. Individual piers settle or heave, the beams sag between them, and the floor above develops soft spots and slopes. The repair is often to add or reset piers and shim the beams back to level, and because you can get under the house, it's usually less invasive than slab work. Crawlspace moisture is what quietly ruins these over time.

Post-tension slabs arrived in Houston subdivisions in the 1980s and are standard in most newer construction. Steel cables run through the concrete under tension, which makes the slab stiffer and better at bridging soft spots. They still move, but as a unit rather than cracking through. You can't cut or core into one without knowing where the cables are, so the repair approach is specific. If your house was built after about 1985 and you don't know which slab you have, that's one of the first things we'll establish.

The repair methods, and when each one fits

Which method suits your house depends on the soil on your lot, how deep the stable layer is, what kind of foundation you have, and what's causing the movement. That's the engineering question, and it decides whether a repair lasts or needs redoing.

• Pressed concrete pilings: the most common Houston repair. Concrete cylinders are hydraulically pressed under the foundation, one on top of the next, until the soil stops giving, then the slab is lifted onto them. Cost-effective and effective in much of the metro, but in some areas they never reach anything stable.
• Steel piers: pipe sections driven thirty feet or more to load-bearing strata or refusal. More per pier, and the right answer where the clay is thick enough that pressed pilings would just sit in more clay.
• Drilled bell-bottom piers: a shaft drilled and belled at the bottom, filled with reinforced concrete. Slower and messier, very durable, still right in some situations.
• Mudjacking or polyurethane injection: lifts a slab that settled evenly without structural distress. Not a fix for an active problem.
• Root barriers: stop a large tree from drying the soil under one side of the house each summer.
• Drainage and plumbing: regrading, extending downspouts, or repairing a leaking sewer line under the slab. Addresses the cause instead of propping up the symptom, and a good share of the houses we see need this rather than piers.

Pressed pilings going in under the grade beam. The depth they reach, not the count, is what decides whether the lift holds.

What we do on a foundation repair job

It starts with the evaluation described above: elevations, crack mapping, drainage and plumbing review, and a written report. If the report says repair is warranted, we design it. That means specifying the pier type, the locations, the spacing, and the target depth, based on the elevation survey and what we know about the soil on your lot. The design is stamped, which matters for the permit and for your records later.

We hold a general contractor's license alongside the engineering, so we can perform the repair ourselves. The crew works from our own drawings, we're on site during the lift, and we take elevation readings after to confirm the slab landed where the design said it would. If you'd rather use a repair contractor you already trust, our design becomes the scope they bid on, and we can inspect their work when it's done.

After the lift, a foundation repair almost always needs some follow-up: cosmetic repairs to the drywall and brick, sometimes a plumbing test to make sure nothing under the slab was strained by the movement, and a drainage fix if that was part of the cause. We tell you what to expect before the work starts so none of it is a surprise.

Costs, and why the pier count matters more than the price per pier

An engineering evaluation with a written report runs a few hundred dollars for a typical house. That's the number to compare against the repair quotes you've been given, because it's usually a small fraction of one of them, and it's the thing that tells you whether the quotes are for the right work.

Repair costs in the Houston area are mostly a function of pier count and pier type. Pressed pilings are the least expensive per pier; steel piers cost more. A partial lift on one corner of a house might be a handful of piers. A whole-house stabilization can be dozens. The spread between a small job and a large one is wide enough that a per-pier price on its own doesn't tell you much. What matters is whether the count is right, and a pier count from an engineer who isn't selling the piers is the only way to know.

Drainage and plumbing fixes are usually far cheaper than piering, which is one of the reasons it's worth finding out whether that's the actual problem before committing to a lift.

Selling, buying, or filing a claim

A lot of foundation evaluations happen because a house is changing hands. A buyer's inspector flagged the foundation, the buyer wants to know if it's a real problem or a Houston problem, and the seller wants to know the same thing before agreeing to a price cut. Our report answers that question for both sides. It says what the elevations are, whether the movement is active or historic, and what, if anything, needs to be done. Realtors on both sides of a deal use it to settle the question and move on.

Insurance claims are a separate situation. Most Texas homeowner policies exclude foundation movement from soil, but they often cover foundation damage caused by a plumbing leak, and telling those two apart is exactly what an engineering evaluation does. If a claim is on the table, the report needs to be written with that in mind, and we know what adjusters look for.

How long it takes

The site visit for an evaluation usually takes an hour or two, depending on the size of the house and how much of the floor is accessible for elevation readings. The written report follows within a few days. If a real estate deal is waiting on it, tell us, and we'll work to the closing date.

The repair itself is faster than most people expect. A typical residential pier job, from mobilization to the lift and cleanup, is a matter of days, not weeks. Larger jobs with a lot of piers or interior work through the slab take longer. Weather matters, because the crew is digging, and a week of heavy rain can push the schedule. Drainage and grading corrections can usually be done alongside the pier work rather than as a separate project.

Permits for foundation repair are required in most of the metro and are generally quick to obtain, since the engineering is already stamped when the application goes in.

When to call, and when it can wait

Ordinary Houston house behavior, usually fine to watch: hairline drywall cracks that don't grow, a door that sticks in August and closes in January, a crack in the garage slab. Note when you first saw them and move on.

Worth a look:

• Cracks getting wider, wide enough for a coin, or running diagonally from the corners of doors and windows.
• Cracks in several rooms at once, or paired with doors and windows going out of square.
• A stair-step crack in the brick that opened recently.
• A floor you can feel slope when you walk it.
• A gap opening between wall and ceiling, or floor and baseboard.
• Anything that appeared suddenly after a plumbing problem, a big tree removal, or a long drought. The cause is still active.