# Slab Foundation Repair San Antonio | Written Quote > Need slab foundation repair in San Antonio? See what our evaluation covers, pier and underpinning options, cost factors, and request a written quote. URL: https://sanantoniofoundationrepair.net/slab-foundation-repair/ ![San Antonio Foundation Repair crew excavating a pier pit beside a slab-on-grade grade beam](/images/misc/foundation-crew-excavating-a-pier-pit-beside-the-g.webp) Most requested # Slab Foundation Repair for San Antonio Homes Last updated: September 16, 2026 Evaluation, potential repair systems, access, scope, and restoration for slab-on-grade foundations. - description Written scope and exclusions - straighten Elevation measured first - engineering Engineer coordination where required request\_quote Request a Foundation Repair Quote [/request-quote/ →](/request-quote/) call (210) 555-7437 [tel:+12105557437 →](tel:+12105557437) - description Written scope, exclusions, and warranty terms with every quote - straighten Elevation measurement before any repair recommendation - foundation Slab-on-grade and pier-and-beam foundations - place San Antonio and surrounding Bexar, Guadalupe, and Comal communities ![Exposed grade beam with a steel pier bracket ready for installation on a San Antonio residential slab](/images/misc/exposed-concrete-grade-beam-in-an-open-excavation-.webp) ## What Does Slab Foundation Repair Involve? Slab foundation repair stabilizes and, where practical, lifts a slab-on-grade foundation that has experienced foundation settlement. Most residential homes in San Antonio built from the 1960s onward sit on a slab-on-grade: a single concrete pour placed directly on prepared ground, thickened at the perimeter and along interior load lines into what is called a grade beam. The slab carries the walls, and the ground carries the slab. When the ground under one section shifts, the slab follows. It is the most common foundation type San Antonio Foundation Repair encounters in the area, and the one most often affected by the region’s expansive clay. Learn more about foundation repair across San Antonio [/ →](/) . Repair works by taking that load off the soil and transferring it to something deeper and more stable. Piers are installed beneath the grade beam, driven down to a load-bearing stratum, and the structure is then supported on the piers rather than on the surface clay. That is the whole mechanism. Everything else is a question of which pier system, how many, where, and how deep. ### Why slabs move here San Antonio sits on a mix of expansive clay soils and, toward the Hill Country and the Balcones Escarpment, shallower limestone. These shifting soils change volume with moisture. Clay swells when wet and shrinks when it dries, and it does so unevenly across a lot because moisture is never uniform. One side of a house has a shaded flower bed and a downspout; the other has full afternoon sun and a mature oak drawing moisture out of the subgrade. Over years, that soil movement produces foundation settlement - where one part of the slab drops relative to another - and that differential settlement is what cracks a wall. Movement is not always downward. Where moisture accumulates under the interior of a slab, often because of an under-slab plumbing leak, the center can rise. That is center heave. Where perimeter clay swells sharply after a wet season, the edges can lift. That is edge lift. Distinguishing among settlement, center heave, and edge lift changes the repair plan completely, and it is not something anyone can establish from a photograph of a crack. ## What Does the On-Site Evaluation Cover? Before any repair is proposed, we take slab elevation measurements across the entire floor plan. Readings are recorded room by room and plotted so the relative differences are visible as a profile rather than a list of numbers. That profile is what tells us whether the low point is a corner, an edge, or the perimeter as a whole, and therefore what shape the movement has. Alongside the measurements we look at: - Interior observations: crack locations and patterns, door and window operation, separation at trim and baseboards, floor slope. - Exterior observations: brick and mortar cracking, separation at window and door frames, visible slab edge condition. - Site conditions: grading and fall away from the foundation, downspout discharge, irrigation placement, standing water, and soil bearing capacity where it can be observed. - Tree proximity and evidence of root-related soil moisture loss near the perimeter. - Any indication of plumbing involvement, which may prompt a recommendation for a hydrostatic plumbing test. - Records of previous foundation work, including existing piers and any transferable warranty. The output is a findings summary and, where repair is warranted, a proposed scope. Where the findings suggest a need for structural engineering input, we coordinate with a Texas licensed professional engineer rather than overstating what a contractor evaluation provides. If the readings do not support repair, that is the finding, and we will say so. ## Pier and Underpinning Options ### Steel push piers Steel push piers are hollow steel sections driven hydraulically, one section at a time, beneath the grade beam using the weight of the structure as resistance. They advance until the gauge records a refusal pressure indicating the pier has reached a competent load-bearing stratum. Because depth follows the ground rather than a preset number, steel push piers suit sites where a suitable stratum is deep or where depth varies across the foundation. Pier installation depth is recorded during installation and forms part of the project record. ### Concrete pressed pilings Concrete pressed pilings are precast cylindrical segments pressed into the ground in a stack beneath the grade beam. They are a long-established approach in Texas, distribute load over a broader bearing face, and can be appropriate where a competent stratum is reached at moderate depth. They are less suited to sites requiring substantial depth, because each added segment increases the risk of misalignment in the stack. ### Drilled and belled piers Where an engineered solution calls for it, drilled piers formed in place can be specified, typically under an engineer’s design. These are less common in residential retrofit work than push piers or pressed pilings but appear in some scopes, particularly where an engineer has designed the repair. Neither steel nor concrete is universally superior. Our guide comparing steel piers and concrete piers [/guide/steel-piers-vs-concrete-piers/ →](/guide/steel-piers-vs-concrete-piers/) sets them side by side on the same criteria, and the selection for your property comes out of the evaluation. ## Perimeter and Interior Pier Placement Most slab repairs begin at the perimeter, because the grade beam runs there and access is from outside. Perimeter piers are installed in excavated pits, brackets are attached to the grade beam, and load is transferred to the pier. Interior pier placement is a different proposition. Reaching an interior load line means either opening the floor from inside or tunneling beneath the slab from outside. Interior access is often faster but removes flooring in the work area. Under-slab tunneling protects interior finishes but adds excavation time and cost. Which is chosen depends on the elevation profile, the flooring in question, and what else is happening on the project. Our guide comparing under-slab tunnelling with interior access [/guide/under-slab-tunneling-vs-interior-access/ →](/guide/under-slab-tunneling-vs-interior-access/) sets out the trade-offs. On post-tensioned concrete slabs, interior work requires locating tendons first. Cutting a tensioned tendon is dangerous and expensive. This is one of the practical reasons the slab type is established early rather than assumed. ## How Hydraulic Lifting Restores a Settled Slab Once piers are in place, hydraulic lifting raises the structure in controlled increments. Jacks along the pier line are operated together so load transfers gradually and the slab moves as a unit rather than at isolated points. The realistic objective is progressive recovery: bringing the structure back toward level within practical limits, with the foundation then supported on piers rather than on surface clay. It is not a return to new-construction flat, and any proposal promising that deserves a second look. Some sheetrock relief cracking and trim movement is normal during a lift. The SA Foundation Repair team explains the expected effects before work begins and states in writing which cosmetic repairs, if any, are included. ## What Affects Slab Repair Cost in San Antonio? The factors that move the number are consistent and worth understanding before you compare proposals: | Factor | Why it changes the cost | | --- | --- | | Pier count | Each pier carries material, labour, excavation, and backfill | | Pier installation depth | Depth follows refusal, not an estimate; deeper means more material and time | | Interior versus exterior access | Interior piers mean flooring removal or tunnelling | | Excavation conditions | Rock, wet clay, utilities, and tight access all slow excavation | | Engineering | An engineer’s design or letter, where required, is a separate cost | | Permits | Requirements depend on scope and jurisdiction | | Associated work | Hydrostatic plumbing testing, drainage correction, or plumbing repair | | Restoration | Backfill and rough grading is the baseline; anything beyond it is scope | A quote without these details is not comparable to one that has them. Whether the project is in Alamo Heights, Converse, or anywhere across Bexar County, these are the variables that separate one proposal from another. Our cost guide covers each factor with dated ranges and explains how to read a proposal, and our quote-comparison guide gives you a framework for setting two proposals side by side fairly. ## When Foundation Repair May Not Be Needed Three situations come up regularly where repair is not what we recommend. The first is cosmetic cracking with a flat elevation profile. If the readings show no meaningful differential, a crack is a crack. Document it, date the photographs, and re-check after a wet season. The second is suspected plumbing-driven heave. If the profile suggests the center is rising, lifting is the wrong first move. A hydrostatic plumbing test comes first, and the plumbing is addressed before any foundation work is considered. The third is a structural question outside a contractor’s scope. Where a consequential structural conclusion is needed, or where a permit requires it, a Texas licensed professional engineer provides an assessment. That is a different document from our proposal, and we will say so rather than blur the line. ## What Happens After the Repair? Post-repair elevation documentation records the floor profile once the lift is complete. Together with the written scope, the warranty terms, and any engineering correspondence, it forms the record of what was done - whether the project was in Live Oak, Helotes, or central San Antonio. Keep it. If you sell the home, a buyer asking about the foundation will be reassured far more by a documented scope and a transferable warranty than by a verbal account of work that happened years ago. Our documented slab repair walkthrough [/blog/documented-slab-repair-northeast-bexar-corridor/ →](/blog/documented-slab-repair-northeast-bexar-corridor/) follows one project from the first call through to that closing record. What is included with every quote - check On-site evaluation of slab movement with elevation measurement - check Pier and underpinning approaches explained with their limitations - check Written scope, exclusions, and applicable warranty terms - check Access, scheduling, disruption, and restoration expectations How we work ## Why Choose Us for Slab Repair straighten ### Measurement before method Slab elevation measurements come first. The repair system follows the findings and the soil bearing capacity we encounter, not a symptom you described on the phone. warning ### Post-tension aware We identify post-tensioned concrete slabs before any drilling or cutting is planned, because striking a tendon is a genuine hazard and changes pier placement. description ### Written, comparable scope Pier count, placement, depth assumption, inclusions, exclusions, schedule, and warranty terms in writing so you can compare our proposal against any other. plumbing ### Plumbing checked before lifting Where the elevation pattern or the home's age suggests it, we recommend a hydrostatic plumbing test before a lift rather than raising a slab against a broken line. engineering ### Engineer coordination Where a permit or a consequential structural conclusion calls for it, we coordinate with a Texas licensed professional engineer instead of overstating what a contractor evaluation provides. fact\_check ### We say when repair can wait Not every crack means active movement. If the readings do not support repair, we tell you that and explain what to document instead. From request to completion ## How Slab Repair Works, Step by Step 1. 01 request\_quote ### Request a quote Tell us your address and what you are noticing. We contact you to discuss the property and set an evaluation appointment. 2. 02 straighten ### On-site evaluation We take slab elevation measurements across the plan, review interior and exterior observations, and note drainage and site conditions. 3. 03 description ### Findings and written scope You receive a findings summary, an elevation floor plan where applicable, and a proposed scope with inclusions, exclusions, and warranty terms. 4. 04 construction ### Repair and restoration Piers are installed, lifting is done in controlled increments, and the site is backfilled and regraded. Post-repair elevation documentation closes the file. ## Have a question about slab repair? Describe what you are seeing and we will tell you plainly whether it warrants an evaluation. call (210) 555-7437 [tel:+12105557437 →](tel:+12105557437) Request a Quote [/request-quote/ →](/request-quote/) ## How San Antonio Foundation Repair Compares | Criterion | Typical provider | SA Foundation Repair | | --- | --- | --- | | Assessment before proposal | Visual walkthrough | Full-plan slab elevation measurements | | Scope documentation | Price and pier count | Scope, exclusions, schedule, and warranty terms in writing | | Pier depth handling | Flat assumption, revised later | Stated depth assumption with a written variance clause | | Plumbing consideration | Not addressed | Hydrostatic plumbing test recommended where indicated | | Post-repair record | None | Post-repair elevation documentation provided | Comparison describes our own documented process against general industry practice. No specific competitor is named or characterised. What the work looks like ## Slab Repair in Practice Illustrative images of the equipment, conditions, and stages involved. Documented project photography is published separately with the project record. In their words ## What Customers Say About Our Slab Repair format\_quote > The quote laid out the method, what was included, and what wasn't. It made comparing proposals much easier. Homeowner Converse format\_quote > They took elevation readings through the whole house and showed me the numbers before talking about piers at all. Homeowner Live Oak format\_quote > They recommended a plumbing test first and explained exactly why. That saved us from lifting against a broken line. Homeowner Universal City These are illustrative, scope-focused examples pending replacement with verified customer reviews. We do not publish invented ratings or review counts. Read our review policy [/reviews/ →](/reviews/) . ## Guides on Slab Repair Longer explanations of the questions that come up most often on this topic. ### What Slab Foundation Repair Involves The scope and process of slab foundation repair: slab construction basics, common repair scope, underpinning overview, and what's included. Read guide arrow\_forward [What Slab Foundation Repair Involves →](/guide/what-slab-foundation-repair-involves/) ### Signs a Slab Foundation Needs Repair How slab-home owners recognize repair-worthy observations, how to document them, and when to request an evaluation. Read guide arrow\_forward [Signs a Slab Foundation Needs Repair →](/guide/signs-a-slab-foundation-needs-repair/) ### How Slab Foundations Are Underpinned with Piers The mechanics of stabilizing a slab with piers: placement, hydraulic lifting, load transfer, progressive recovery, and restoration. Read guide arrow\_forward [How Slab Foundations Are Underpinned with Piers →](/guide/how-slab-foundations-are-underpinned-with-piers/) ### Hydrostatic Plumbing Testing Before and After Slab Repair What a hydrostatic plumbing test is, why lifting against broken plumbing causes problems, and when pre/post-lift testing is recommended. Read guide arrow\_forward [Hydrostatic Plumbing Testing Before and After Slab Repair →](/guide/hydrostatic-plumbing-testing-before-and-after-slab-repair/) ### Under-Slab Tunneling vs. Interior Access Compare exterior under-slab tunneling with interior access: flooring impact, disruption, cost and timeline factors, and when each is chosen. Read guide arrow\_forward [Under-Slab Tunneling vs. Interior Access →](/guide/under-slab-tunneling-vs-interior-access/) ### Slab Repair vs. Slab Replacement Weigh repairing versus replacing a slab foundation: criteria, scope and cost differences, when replacement is warranted, and why it's property-specific. Read guide arrow\_forward [Slab Repair vs. Slab Replacement →](/guide/slab-repair-vs-slab-replacement/) Questions we are asked ## Slab Repair FAQs ### How much does slab foundation repair cost in San Antonio? expand\_more There is no single figure that is honest across properties. Cost is driven by pier count, pier installation depth, whether interior piers are required, excavation and access conditions, any engineering, permits, associated work such as plumbing testing, and the restoration included. A home needing eight exterior piers and a home needing twenty-two piers with interior access are different projects with different totals. We publish the factors and provide a written quote with current 2026 pricing after an on-site evaluation rather than a citywide average that hides the scope. Our cost guide walks through each factor in detail. ### How do I know whether my slab actually needs repair? expand\_more You do not know from appearance, and neither does anyone else. Slab elevation measurements taken across the whole floor plan establish how much differential settlement exists and where. Those readings, combined with interior and exterior observations and a look at drainage, are what distinguish active movement from cosmetic cracking or seasonal change. If the measurements do not support repair, we say so and explain what to document so you have a baseline to compare against later. ### What is the difference between a post-tensioned slab and a conventionally reinforced slab? expand\_more Conventionally reinforced concrete slabs use steel reinforcing bar cast into the concrete. Post-tensioned concrete slabs use steel tendons that are tensioned after the concrete cures, placing the slab under compression. The difference matters for repair because tendons run through the slab and must not be cut or drilled. Post-tensioned slabs are routinely underpinned, but pier placement and interior access have to account for the tendon layout. We identify the slab type during the evaluation. ### Are steel push piers better than concrete pressed pilings? expand\_more Neither is universally better. Steel push piers are driven in sections under hydraulic force until refusal pressure confirms bearing on a suitable load-bearing stratum, which can reach greater depth. Concrete pressed pilings are stacked cylinders pressed beneath the grade beam and distribute load differently. The right choice depends on depth to a competent stratum, structural load, soil bearing capacity, and access on the specific property. Selection follows an on-site assessment, not a symptom or a ZIP code. ### What is differential settlement? expand\_more Differential settlement is uneven downward movement, where one part of a foundation drops relative to another. That relative difference is what stresses a structure and produces cracking, sticking doors, and sloping floors. Uniform settlement across an entire slab rarely produces visible damage. This is why a single low reading in one room is less informative than the pattern across the whole elevation survey. ### What are center heave and edge lift? expand\_more These describe upward movement rather than settlement. Center heave is a rise in the middle of a slab, often associated with moisture accumulating under the interior, including from an under-slab plumbing leak. Edge lift is a rise around the perimeter, often associated with expansive clay swelling after heavy rain. Both produce a floor profile that looks nothing like ordinary settlement, which is why the direction of movement matters as much as its magnitude. ### How does hydraulic lifting work without cracking the slab further? expand\_more Lifting is done in controlled increments with synchronised hydraulic jacks distributed along the pier line, so load transfers gradually rather than at a single point. The objective is progressive recovery toward a more level position, not an instant return to new-construction flat. Some relief cracking in sheetrock and some trim movement is normal as the structure moves. We explain the expected effects before work begins and state in writing what restoration is included. ### What does it mean when a pier is driven to refusal? expand\_more Piers are advanced until the hydraulic gauge shows refusal pressure, which indicates the pier has reached a stratum capable of carrying the design load. Depth is therefore an outcome of the ground rather than a number chosen in advance, and it can differ substantially across one foundation, particularly on the Hill Country side of the area. Our quote states the depth assumption used for pricing and how a variance is handled. ### Do I need a hydrostatic plumbing test before slab repair? expand\_more Not always, but it is recommended where the elevation pattern suggests heave, where the home has original cast-iron drain lines, or where a significant lift is planned. Raising a slab puts stress on the lines running beneath it. A hydrostatic plumbing test identifies pre-existing breaks before the lift so you are not solving a foundation problem and creating a plumbing one on the same day. ### Will slab repair damage my landscaping or flooring? expand\_more Exterior pier work means excavation around the perimeter, spoil piles during the project, and disturbance to beds, turf, and irrigation lines within the work zone. Interior piers require flooring removal in the work area. Neither is avoidable if the piers are needed there. What matters is that the written scope states exactly what restoration is included, whether that is backfill and rough grading only or something more, so the expectation is set before the first shovel. ### How long does slab foundation repair take? expand\_more Exterior pier work on a typical single-story home often runs a few working days from excavation through lift, backfill, and grading. Projects involving interior piers, under-slab tunneling, plumbing testing, or a larger pier count take longer. Weather and soil conditions affect excavation time. The written quote provides a project-specific schedule rather than a generic range. ### Can root-related soil moisture loss cause slab movement? expand\_more It can contribute. Large trees draw moisture from expansive clay during dry periods, and localized drying near a root mass can produce shrinkage under one section of a slab. Species, distance from the foundation, and root direction all matter. We note what we observe during the evaluation and explain the relationship, without claiming a tree is the sole cause or recommending removal by default. ### What happens after the repair is finished? expand\_more Post-repair elevation documentation records where the floor sits after the lift, which gives you a measured baseline rather than an impression. You also retain the written scope, the warranty terms, and any engineering correspondence. Those documents matter later, particularly at sale, when a buyer wants to see what was done rather than take your word for it. ### Will homeowners insurance pay for foundation repair? expand\_more Standard homeowners insurance policies in Texas generally do not cover foundation repair caused by soil movement, settling, or normal wear. Coverage may apply if the damage results from a sudden covered event such as a plumbing break, but the claim process and exclusions vary by carrier. We recommend reviewing your policy with your insurer before scheduling work. Our written scope can support a claim filing if your carrier requires documentation of the proposed repair. ## Related Services fact\_check ### Foundation Evaluation Who attends, what is examined, and what the customer receives from an on-site evaluation. Learn more arrow\_forward [Foundation Evaluation →](/foundation-evaluation/) home\_work ### Pier-and-Beam Repair Piers, beams, joists, crawlspaces, access, and related work for pier-and-beam foundations. Learn more arrow\_forward [Pier-and-Beam Repair →](/pier-and-beam-repair/) linear\_scale ### Crack Repair Foundation crack repair in San Antonio covering cosmetic filling, sealing, and structural work for residential and commercial properties. Learn more arrow\_forward [Crack Repair →](/crack-repair/) ![](/images/misc/homeowner-and-foundation-specialist-reviewing-a-wr.webp) No obligation, no pressure ## Ready to talk about slab repair? Tell us about your property and what you are noticing. We will contact you to discuss the project and the next step toward a quote. request\_quote Request a Foundation Repair Quote [/request-quote/ →](/request-quote/) call (210) 555-7437 [tel:+12105557437 →](tel:+12105557437) - check\_circle Written scope and exclusions - check\_circle Elevation measured before any recommendation - check\_circle We say when repair is not needed