Foundation Repair Cost in San Antonio, TX
Last verified 2026-08-14Bexar County ranks 1st of 33 metros on this index for weeks spent in severe drought, and 73% of its rated soil has some shrink-swell limitation. Together they point most slab problems here toward the pier rows of the table.
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| Repair type | Low | Typical | High |
|---|---|---|---|
| Crack repair (epoxy / stitching)per crack | $200 | $500 | $1,000 |
| Leak repair & waterproofingper project | $1,900 | $4,900 | $11,600 |
| Mudjacking / slab levelingper project † | $500 | $2,900 | $8,700 |
| Pier installation (piering / underpinning)per pier | $1,000 | $1,700 | $2,900 |
| Settling / sinking correction (full underpinning)per project | $4,400 | $14,600 | $29,100 |
| Bowing wall reinforcementper project | $3,900 | $8,700 | $14,600 |
| Drainage correctionper project | $2,700 | $5,300 | $11,600 |
† Mudjacking / slab leveling: Sources disagree widely (>3x): polyurethane foam spot-lifts run well under $1,500, while full slab mudjacking with structural fill runs $4,500–$9,000. Range widened to cover both.
85 weeks of drought under Bexar County slabs
The U.S. Drought Monitor draws a new map every week. Of the 522 maps through October 6, 2026, 204 showed at least half of Bexar County in severe drought or worse, which is 39% of the weeks. In 157 of them, half the county had gone a step further, into extreme drought.
The longest unbroken stretch began in October 2024 and ran 85 weeks, to May 2026. Inside it, 2025 logged 52 severe weeks, a full calendar year without relief.
Clay loses water from the outside in. Soil along the edge of a slab dries and shrinks first while soil under the middle keeps its moisture, so the perimeter drops and the center stays high. In a house that reads as diagonal cracks climbing from the corners of doors and windows, stair-step cracks in exterior brick, and doors that drag or will not latch.
U.S. Drought Monitor county statistics, weekly maps through October 6, 2026 (2026 is year to date).
When rain returns to shrunken clay
The most recent weekly map with half the county in severe drought is dated May 2026. After a dry spell this long, the wetter seasons that follow can move a house almost as much as the drought did. Clay that pulled away from the slab takes water back and swells, and edges that dropped can rise again. Doors that stuck may start closing, and some cracks narrow.
That is a reason to measure before you pay for a large repair. Ask for a floor-elevation survey now and a second one a few months into wetter weather. A slab still sinking in one direction needs support. A slab that rises and falls with the seasons is a moisture problem first, and drainage correction ($2,700–$11,600) or steady watering along the foundation may do more for it than a row of piers.
Houston Black clay and thin Eckrant soil in one county
NRCS soil surveys rate every mapped soil for the use that matters here: a house built without a basement. In Bexar County, 46% of rated acres are very limited by shrink-swell and 27% more are somewhat limited, which ranks the county 8th of 33 on the very-limited share. The survey covers the top few feet of ground countywide, ranch and farm land included, and land already mapped as urban carries no rating, so the figure describes the county's soils rather than your street.
By acreage, Bexar County's leading very-limited series are Houston Black, Lewisville and Eckrant. Houston Black is the deep, dark clay of the Blackland Prairie. Eckrant is a different case: a thin, stony clay sitting on limestone. A slab can rest near rock at one corner and on deep clay at another, and two lots in the same subdivision can behave very differently. A repair plan should rest on what is under your house, which a soil boring or an engineer's site visit can tell you.
USDA NRCS soil survey (SSURGO) for Bexar County, rating “ENG - Dwellings W/O Basements”.
Where a Bexar County repair budget lands
Drought-driven edge settlement points to the support rows of the table:
- Piers run $1,000–$2,900 each here, typically $1,700. A repair limited to the corner or side that dropped may need only a handful; the count, more than the price per pier, sets the bill.
- Full underpinning runs $4,400–$29,100, with $14,600 typical. Expect the upper half when the whole perimeter needs support.
- Crack repair at $200–$1,000 per crack seals out water but does not stop a slab from moving. Done alone on active clay, it tends to reopen.
- Mudjacking or slab leveling ($500–$8,700) adds weight to soil that is still shrinking and swelling. It suits patios, walks and driveways better than a house slab on Houston Black.
Labor sets part of every price. San Antonio's factor is 0.97, from construction wages 6% below the national average. That puts the middle of this table at $4,900, against $5,100 in Austin and $4,700 in Waco.
Why a drought crack is not an insurance claim
A standard homeowners policy lists the causes of drought damage among its exclusions: earth movement, soil that shrinks and swells, and settling, along with ordinary wear. Those causes are behind most foundation movement in Bexar County, so claims for it are routinely turned down. The opening is narrow. If a sudden covered event, such as a water line bursting under the slab, washes soil away, the policy may respond to that damage. Check the earth-movement and water-damage wording in your own policy before you file.
A home warranty won’t fix a foundation — but it covers the systems around it (AC, heating, plumbing, electrical, appliances), so the next breakdown in your San Antonio home isn’t another four-figure shock.
Get a Choice Home Warranty quote → Sponsored- A floor-elevation survey, with the readings attached to the bid
- The pier type, the depth each pier reaches, and how that depth gets recorded
- How many piers, with a drawing of where each one goes
- A plumbing test before and after lifting, since raising a slab can crack drain lines
- Whether the warranty follows the house to the next owner
San Antonio questions on drought, clay and repair cost
Should I wait for rain before repairing my San Antonio foundation?
If the house is safe and the doors still work, waiting through part of a wet season can be worth it. Bexar County clay that shrank in the drought swells again when it gets water, and some slabs recover part of what they lost. Get a floor-elevation survey now and again a few months later. Pay to support what keeps moving, and treat the rest with drainage and steady soil moisture.
Is mudjacking a good fix on Houston Black clay?
For a house slab, usually not. Mudjacking pumps a cement slurry under the concrete to lift it, which adds weight to clay that will keep shrinking and swelling with the seasons. Lighter foam lifts suit small areas, and both work best on driveways, walks and patios. In San Antonio this row runs $500–$8,700; piers cost more but bear on firmer ground below the clay that moves.
What does full underpinning cost for a San Antonio slab?
Full underpinning runs $4,400–$29,100 in San Antonio, with $14,600 typical. The range is wide because the pier count drives it: a corner repair may use a few piers at about $1,700 each, while supporting a whole perimeter takes many. Bids also differ by pier type, depth, and whether drainage work and plumbing tests are included, so compare the scope line by line.
Do San Antonio foundation contractors charge less than Austin's?
Slightly, by this index. San Antonio's labor factor is 0.97 against Austin's 1.02, both built from local construction wages, and the middle repair in the table is $4,900 here against $5,100 in Austin. That gap is small next to the spread between two bids on the same house, so the scope of work matters more than where the crew is based.
Will homeowners insurance pay for drought cracks in a San Antonio house?
Almost never. Standard policies exclude damage from earth movement, settling, and soil that expands and contracts, which is exactly what drought does to Bexar County clay. The exception is damage from a sudden covered event, for example a pipe under the slab bursting and washing soil out, and even then the policy answers for that event's damage, not years of movement. Read your policy's exclusions before calling a claims line.
Hold each quote up against the San Antonio numbers above. Angi sends your project details to foundation contractors in your area, who contact you with quotes. No obligation to hire.
Compare foundation repair quotes in San Antonio → SponsoredNearby & related
- HomeGuide — https://homeguide.com/costs/foundation-repair-cost
- Today's Homeowner — https://todayshomeowner.com/foundation/cost/foundation-repair-cost/
- Bob Vila — https://www.bobvila.com/articles/foundation-repair-cost/
- This Old House — https://www.thisoldhouse.com/foundations/reviews/foundation-repair-cost