Slab-on-grade · San Antonio & the I-35 corridor · Lifetime transferable warranty
Slab foundation repair, sized by the elevation survey — not the sales pitch.
Slab foundation repair in San Antonio is usually one settled edge, not a failing house — most homes here built since the 1950s sit on a slab, and what looks like “foundation failure” is an edge that dropped when the clay underneath dried out. We measure your floor, support the settled section on piers driven to load-bearing soil, and lift it back toward plane in stages you can watch on the readings. Start with a free foundation inspection — measurements first, method second.
Financing available through Acorn Finance — check your rate in minutes, no credit-score impact →
What’s actually happening
A slab doesn’t sink. The clay under one edge leaves.
A slab-on-grade foundation is a single poured plane resting directly on the soil. In Central Texas that soil is expansive clay — it swells when it’s wet and shrinks when it’s dry, and it almost never does both evenly across a whole house. A perimeter edge dries faster than the protected center, drops, and takes the corner of the slab with it. That’s settlement. When a wet spot — a leak, a downspout, a flower bed on a soaker — pushes one area up instead, that’s heave. Same clay, opposite directions, and the elevation map is how we tell which one your house is doing.
This is why honest slab repair starts with a measurement, not a crack. A stair-step crack in the brick tells you something moved; it doesn’t tell you how far, in which direction, or whether it’s still moving. The free survey answers all three — and about half the time it ends with “monitor it, don’t repair it,” which is an answer you should be able to get for free.
What homeowners notice first
The signs a slab edge has moved.
Stair-step brick cracks
Diagonal cracks climbing the mortar joints near a corner — the brick veneer reporting that the slab behind it tilted. How to read the wedge →
Doors and windows racking
One sticky door is weather. A cluster — front door, hall door, a window that won’t latch, all on the same side — is geometry. Why doors stick →
Sloping or bouncing floors
A marble that rolls the same way in every room, or a floor that dips toward one corner, points to a plane that’s no longer flat. Cosmetic or structural? →
Cracks at wall-ceiling corners
Diagonal cracks fanning from door and window corners, or separation where the wall meets the ceiling, as the frame racks with the slab.
Gaps under baseboards & trim
Daylight under a baseboard, or trim pulling away from the slab at an exterior door, where the edge dropped out from under the finish.
Cracks that move with the seasons
A hairline that opens every August and tightens after fall rain is the clay cycle talking — sometimes monitoring, sometimes the early signal worth catching.
The question behind most calls
Cracks in your slab: which ones matter?
Almost every slab has cracks — concrete shrinks as it cures, and hairlines are part of the material. The ones worth attention follow movement: cracks that are wide (a coin fits), widening (photograph it next to a coin, compare in a season), offset (one side sits higher than the other), or clustered with other symptoms at the same corner — racking doors, a slope, stair-step cracks in the brick outside. Our slab-specific guide, cracks in a foundation slab: hairline, shrinkage, or structural, triages them photo by photo; how to tell if foundation cracks are serious walks the full read, and the complete signs list ranks everything else your house might be saying. The short version: a crack tells you something moved; the elevation survey tells you how far, which direction, and whether it's still going — and that's the difference between a patch and a pier.
How the repair runs
Excavate, support, lift — and measure between every step.
Elevation survey
A grid of floor readings establishes how far each area sits from the original plane. This is the quote and the plan — pier count comes from the map, not a guess.
Excavate at the settled edge
Compact pits open at the marked pier locations along the affected run — typically about every 6 feet, with corners getting priority.
Install piers to load-bearing soil
Steel, concrete-and-rebar, or hybrid piers go in beneath the grade beam, driven or pressed until the soil proves it carries the load.
Stage the lift
Hydraulic rams raise the settled section in small increments, re-shooting elevations between stages so we lift to the map, not the eye.
Backfill and document
Pits are closed, the site is cleaned, and you get the before-and-after elevation maps, the pier log, and the warranty paperwork.
What goes under the slab
Three pier methods. The soil and the readings pick the one.
There is no single “best” pier — there’s the right one for your soil, your structure, and your budget. Here’s how to compare them honestly, and the table lays out the trade-offs.
Make sure it’s actually a slab problem
Slab-on-grade and pier-and-beam are different repairs.
If your house was built after about 1960, it’s almost certainly slab-on-grade, and the work above is the work. But San Antonio’s pre-war neighborhoods — Monte Vista, Beacon Hill, King William — are largely pier-and-beam, leveled from underneath in the crawlspace for a fraction of slab-pier money. A bid that quotes perimeter piers for a crawlspace house is the most expensive mistake in this trade. Our inspection checks which foundation you actually have before anyone talks price — here’s how to tell yourself in five minutes — and if you already hold a quote that feels off, a free second opinion is the cheapest insurance there is.
Money, plainly
What slab foundation repair costs.
Slab repair is priced by the piers it takes to make the fix permanent. A settled corner (4–6 piers) typically runs $2,500–$6,000; a full side (8–12 piers) runs $5,000–$12,000; and severe, multi-side movement — usually the result of years of deferral — climbs from there. Method, access, and whether plumbing or drainage work is needed move the number. Catching it early is the biggest lever you control: a two-pier corner today beats a ten-pier side after three more droughts. The slab repair cost breakdown walks every scope and range, the cost guide covers the full method math, the San Antonio cost guide covers local multipliers, and the calculator gives you a defensible number tonight.
Financing through Acorn Finance, an independent third party. Checking your rate won’t affect your credit score.
From a Google review
“From the inspection to the recommendations, everything was clear. They installed about 15 piers, the cracks closed, and the doors are working properly again.”
Slab specifics
Slab foundation repair questions, answered straight.
From real jobs and inspections
Slab repair, documented end to end.
Find out what your slab is actually doing — for free.
A free elevation survey, written readings, and a straight answer: repair it, monitor it, or leave it alone.
Now booking free inspections in Central Texas.