Foundation Repair San Antonio: $2,225 to $8,133 (2026)

We found no San Antonio price from a publisher we use. Every row is a national figure and is labeled that way; each publisher's range is shown on its own and none are merged. The company that answers quotes its own inspection fee before anything is booked.

Do this now, before you call a San Antonio foundation company

1. Measure and photograph the crack with a date. HomeGuide treats cracks under 1/8 inch as often cosmetic and flags cracks wider than 1/8 inch; put a pencil mark at each end so you can see whether it grows. The ASCE Texas Section guideline says the majority of cracks do not compromise structural integrity, so the record matters more than the first look.
2. Walk the outside after a rain. The ASCE Texas Section guideline calls for grading that falls at least 5 percent for the first 5 feet from the wall and downspouts that discharge well away from it. Pooling water, a short downspout or a flat bed against the house explains a lot of movement.
3. Note doors, floors and the crack pattern. Doors that stick, gaps over cabinets and a floor you can feel slope are the signs HomeGuide lists; the guideline says a floor slope over 1 percent is usually noticeable. Diagonal cracks at corners that are wider at one end are the settlement pattern engineers look for (Forcon).
4. Look at the soil along the slab edge. In a dry San Antonio summer the clay east of the city shrinks away from the foundation; the NRCS description of Houston Black clay puts surface cracks at 1/2 to 4 inches wide at 12 inches deep in dry periods. A gap you can put your fingers in is worth a photo and a note on the date, because it tells an engineer how much the soil moved before the house did.
5. Decide who inspects first. A foundation repair company's visit is often free; a structural engineer's report costs $300 to $1,000 (Angi) and comes with no repair to sell. HomeGuide warns that companies offering free inspections "may be more likely to recommend repairs to get your business." Foundation inspection cost explains the difference.
6. If there is standing water, keep clear of outlets and equipment. Do not touch electrical equipment if it is wet or you are standing in water (Red Cross). A gas smell with any of this: leave, then call 911 or the gas utility from outside.

Is it urgent? Foundation signs in San Antonio that should not wait

Most foundation movement in San Antonio is measured in months, and the ASCE Texas Section guideline says the majority of cracks do not compromise structural integrity. Three things are worth a prompt call rather than a wait-and-see, and none of them is a verdict on your house: a wall that is visibly leaning or has shifted since you last looked; a new horizontal crack at mid-height with the wall bowing inward, which Forcon's engineering guide calls "a cause for immediate concern" because it comes from soil pressure; and plumbing that has stopped draining under a slab, which can mean a broken line washing out the soil beneath it. After a long dry spell ends with a heavy rain, watch for cracks that opened in summer closing or new ones opening at corners; that swing is the Blackland clay rewetting and is the pattern a company would ask you about first.

Everything else, a hairline crack, a door that started sticking this summer, a slope you noticed with a marble, is a measured problem. Photograph it, mark it and book an inspection within a few weeks. HomeGuide prices a single crack injection at $250 to $800 nationally; settling that calls for piers runs $4,500 to $20,000, and the first visit is usually an inspection with a written plan, not a repair.

Clay soil in San Antonio: why the Blackland Prairie matters here

San Antonio sits at the southern end of the Texas Blackland Prairie. The USDA NRCS description of that land resource area (MLRA 86A) runs "from the Red River in North Texas to San Antonio in the south" and names San Antonio, Austin and Dallas as cities inside its boundary; its upland soils formed in marine sediments "high in smectitic clays," and the NRCS rates shrink-swell potential as very high. The best known of those soils, Houston Black, is the recommended Texas state soil, with about 1.5 million acres from north of Dallas south to San Antonio; the NRCS fact sheet says in metropolitan areas its "very high shrink-swell potential commonly is a limitation affecting building site development."

The numbers behind that rating are what move a slab. The official Houston Black series description reports cracks 1/2 to 4 inches wide at 12 inches deep during dry periods that stay open 90 to 150 cumulative days in most years, and the NRCS notes rainfall in the Blackland Prairie averages about 40 inches but "varies considerably from month-to-month and from year-to-year." Soils outside the Blackland boundary behave differently, which is one reason an engineer would want to know your address before guessing at a cause. A foundation contractor would check the crack pattern, measure floor elevations with a level, look for a plumbing leak under the slab, and look at trees and drainage on the side that moved.

San Antonio foundation repair permit: issued over the counter

The City of San Antonio lists a Foundation Repair permit on its residential permits page for both homeowners and residential building contractors, issued over the counter; a homeowner applying needs proof of ownership, and the application is form IB 172. The residential permit matrix defines the permit as "Commercial and Residential Repairs of existing foundations." Fees are in the Development Services fee schedule rather than on the page; Angi's national figure for foundation permits is $75 to $150. Customer service is 3-1-1 or 210-207-6000. Ask the company who pulls the permit and whether the price includes it.

Watering the foundation under SAWS drought rules

Keeping soil moisture even around the slab is the first non-structural measure in the ASCE Texas Section guideline, which cautions against overwatering as much as drought. In San Antonio that runs into SAWS drought stages. Under year-round rules, when the Edwards Aquifer is above 660 feet at the monitored well, irrigation systems, sprinklers and soaker hoses may run any day from midnight to 10 a.m. and 9 p.m. to midnight. Stage 1 starts when the 10-day rolling average drops to 660 feet, and sprinklers and soaker hoses are then allowed only once a week on your designated day, with drip up to three times a week; Stage 2 begins at 650 feet and Stage 3 at 640 feet, with a $10.37 per thousand gallon surcharge above 20,000 gallons a month in Stage 3. The SAWS page does not carve out foundations, so a soaker hose around a slab follows the same stage rules as a lawn.

Licensing in Texas and what to ask a San Antonio company

Texas has no state license for foundation repair. A 2011 bill that would have created one, S.B. 1399, said at the time that "there is no state regulation in place to directly mitigate these risks" and noted "increasing numbers of predatory practices by underfunded but opportunistic repair companies"; it did not become law, and the Texas Department of Licensing and Regulation's list of 41 regulated industries still has no foundation repair or general contractor program. What Texas does regulate is the engineer: the ASCE Texas Section guideline says "the evaluation and repair design shall be performed by a professional engineer licensed in the State of Texas," that the engineer of record has approval authority over changes, and that Texas rules prohibit plan stamping. So the two questions to ask any company are whether a Texas-licensed engineer designs and signs the plan, and what the warranty covers if the house moves again. Ask for proof of insurance either way.

The Census puts San Antonio's median home at 1985, so a large share of the housing stock is 40-year-old slab-on-grade construction. A contractor would check the age of the plumbing under that slab before anything else, because a leaking drain line saturates the clay on one side of the house; slab leak repair in San Antonio covers that test.

Local soil, permit and licensing facts for San Antonio, from official city, state, USDA and Census pages unless marked.

More San Antonio repair guides

Water under the slab is the usual first check: slab leak repair and a San Antonio plumber. Sewer lines in old clay: sewer line repair in San Antonio. Wet walls after a leak: mold removal in San Antonio. Termite damage to piers and sills: pest control in San Antonio. All trades: home repair in San Antonio. Compare foundation repair in Austin and foundation repair in Houston. All foundation guides: foundation repair, foundation repair cost, basement crack repair, foundation underpinning, French drain cost. Calls go to an independent foundation repair company that serves your area and takes this kind of job; hours vary (how calls work).