In depth
Foundation Leveling in San Antonio: how the job actually runs
Foundation leveling is the part of the job where the house comes back up. Piers are the support; leveling is the lift onto that support, done with hydraulic jacks in small stages while someone inside watches the doors and the walls. In San Antonio it follows the same elevation survey whether the house is a 1960s slab in Highland Hills that dropped a corner on Blackland clay, a 2010 post-tension slab in Helotes that tilted on fill, or a 1940s pier and beam cottage with compressed shims. The target is stable and close, not perfect, and the difference matters.
Why houses drop in San Antonio
South and east of the Balcones fault, the clay under a slab swells after a wet spring and shrinks through a dry summer, and a house whose soil is wetter on one side than the other tilts toward the dry side. A live oak on one corner, a downspout dumping on the other, a sprinkler soaking one bed nightly: each one makes a wet edge and a dry edge. North and west of the fault, post-tension slabs on cut-and-fill lots settle where the fill was loose, one-directional and slow. Under 1950s to 1980s slabs anywhere in the metro, a cast iron drain that corroded through wets the clay under a kitchen or bath and lifts that section while the perimeter drops, so the slab reads high in the middle and low at the edges. Pier and beam houses drop where shims compressed, piers sank or a sill rotted. The full explanation is in why San Antonio homes have foundation problems.
What the survey sets
The elevation survey before the lift is the target. A level reading every few feet across the slab or floor, written on a plan, shows how far each section is low against the rest of the house, and the lift plan is drawn from it: which sections rise, how much, and in what order. A single dropped corner is a small lift on 4 to 6 piers. A whole side that tilted is 10 to 14 piers lifted together so the house comes up as a unit. A slab that is high in the middle over a leak is not lifted at all until the leak is fixed, because the interior will keep rising; that job starts at foundation leak repair.
Support before lift
On a slab home, nothing is lifted until there is something to rest it on. Holes are dug at each pier location along the grade beam and pressed concrete pilings or steel piers are pressed to refusal, which in the northeast and south clay means a useful depth and in Helotes or Stone Oak often means rock within a few feet. The method for the soil is explained on the slab foundation repair page. On a pier and beam home, new concrete piers on footings go in where the old ones sank or crumbled, and rotted sills and beams are replaced before anything is jacked on them.
The lift itself
Hydraulic jacks go under the grade beam at each pier, or under the beams in a crawl space. The section rises a fraction at a time, and between stages someone inside checks the doors, the windows and the walls. Brick cracks close on the way up, sometimes all the way, usually most of the way. Drywall hairlines at door frames and ceiling corners open and close. Tile grout lines are watched. When the doors latch, the brick shuts and the survey reads close, the crew stops, and it stops earlier if the house starts to protest.
Then steel shims lock the height on each pier, the jacks come out, and the load rests on the piers instead of the clay. On slab homes a hydrostatic test is run on the drains, because a lift can open a joint in an old cast iron line and a leak found now is cheaper than one found next spring. Holes are backfilled, sod and shrubs replaced where practical, and interior floor patched where interior piers were set. The final elevations go on the plan.
| Situation | Typical lift | What is watched |
|---|---|---|
| One corner dropped an inch under a tree, slab, 1960s | 4–6 pilings, corner raised most of the way | Brick above the corner window, the closest door |
| One side tilted, post-tension slab, 2000s | 10–14 piers, side raised as a unit | Garage door brick, doors on the low side |
| Interior heave over a leak, perimeter low | Leak repaired first; then perimeter lift | Cracked tile, interior doors, second plumbing test |
| Pier and beam floor sagging and dropped at a corner | Reshim, 2–4 new piers, corner sill replaced | Plaster at door corners, the porch connection |
| Garage or slab addition dropped away from the house | Piers along the joint, addition raised to meet the house | The joint, the roof line where they meet |
Stable and close
A house that dropped an inch and a half over ten years has been living with that tilt: drywall taped, tile grouted, doors planed, a threshold shimmed. Forcing it back to dead level in an afternoon cracks plaster, splits grout lines and can break a drain joint under a slab. On a 1920s pier and beam house with lath and plaster, the cost of the last quarter inch is a room full of cracks. The lift targets the elevation the house can take, the doors and the brick tell the crew when it is there, and the record shows exactly where it landed. What holds it there is the piers underneath and the moisture around the foundation afterward, which is why drainage correction and a soaker hose plan are part of most proposals.
What it costs
On a slab home, leveling is included in per-pier pricing: a typical lift with 8 to 12 pressed concrete pilings runs $4,500 to $14,000, with steel piers at $1,000 to $1,800 each where pilings refuse on rock. Pier and beam leveling and reshimming runs $1,500 to $5,000, and any sill, beam or joist replacement found during the lift is $3,000 to $12,000, quoted before it is done. A hydrostatic test after the lift is $250 to $500, and an engineer’s letter, when the permit or a buyer requires it, $400 to $900. The full table is in the cost guide.
While you wait
Move anything fragile off shelves on the low side, since a lift moves the walls. Photograph the cracks with a coin and a date so you can compare after. If a door has been planed to fit the tilt, expect it to need adjusting the other way once the house is up. Do not jack anything yourself. Then send the form with the neighborhood, the foundation type if you know it and which corner is low, and you will get an evaluation window and a written lift plan with the elevation targets on it.
Last updated September 12, 2026
