Bexar County sits on some of the most active clay in the state. Get a free inspection quote from a foundation contractor working in your part of San Antonio.
Fig. 1 — Across much of Bexar County, piers must reach limestone beneath the active clay.
San Antonio sits across a sharp geological divide. North of the Balcones Escarpment — Stone Oak, Hollywood Park, parts of Helotes — you're on thinner soil over limestone. South and east, through much of the older city and out toward Converse and Schertz, the ground is deep expansive clay.
That clay changes volume with moisture. A wet spring swells it and lifts whatever sits above; a long dry summer shrinks it and lets that weight drop. Because the drying is never even — one side of the house is shaded, another has a large oak pulling water from the soil — the movement happens unevenly, and it's the unevenness that cracks a house rather than the movement itself.
San Antonio's drought cycles make this worse than the Texas average. Long dry stretches broken by heavy rain are the exact pattern that does the most damage, which is why foundation work here rarely stays quiet for more than a few seasons at a time.
Older housing stock, much of it pier and beam with crawl spaces. Problems present as sloping or bouncing floors and separation at interior door frames rather than exterior brick cracking.
Thinner soil over limestone. Movement is often less severe, but where fill was brought in to level a lot, differential settlement can be sharp and localized.
Deep clay and rapid subdivision growth. Newer slabs on expansive soil, with drainage that hasn't matured — a common source of early perimeter movement.
Mixed older construction on active clay. Long-standing movement that has often been repaired before; worth asking any contractor to review prior work.
| Work | Typical range |
|---|---|
| Inspection and elevation survey | Usually free |
| Structural engineer's report | $350–700 |
| Single pier | $300–700 |
| Partial perimeter lift (8–12 piers) | $3,500–8,500 |
| Full perimeter slab repair | $8,000–18,000 |
| Pier and beam releveling | $2,500–7,500 |
Ranges are for orientation. Bexar County lots vary widely in how deep stable ground sits, and depth is the single biggest driver of price.
Send your details and a foundation contractor serving your part of San Antonio will call to arrange a free inspection. No cost, no obligation.
Prefer to talk? Call (833) 555-0100.
San Antonio and Bexar County.