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Residential · San Antonio, TX
Foundation Slabs in San Antonio
Foundation slabs aren’t like other concrete work. They support your entire structure, and once a house, ADU, casita, or addition is sitting on top, you don’t get to redo the foundation.
Foundation Slabs San Antonio
Foundation slabs aren’t like other concrete work. They support your entire structure, and once a house, ADU, casita, or addition is sitting on top, you don’t get to redo the foundation. We pour residential foundation slabs across San Antonio to engineer-stamped specs.
Foundation slabs we install
Foundation slab work is structural concrete, and we treat it that way.
Common foundation projects:
- Home additions (bedroom, kitchen, garage)
- Detached ADUs and casitas
- Workshops and shop buildings
- Pool house and cabana foundations
- Detached garage foundations
- Sunroom and porch foundations
- Carport and covered patio foundations
Engineering and permits
Foundation slabs almost always require an engineer’s stamp and a city permit in San Antonio. We work routinely with local structural engineers. We pour to the engineer’s spec exactly.
The structural prep that makes foundations last
Foundation failures in South Texas are almost always related to soil — our expansive clay swells when wet and shrinks when dry. We follow the engineered specs precisely: proper sub-base, moisture barrier, void boxes where specified, deep beams, and the right rebar grid.
Slab-on-grade vs. post-tension vs. pier-and-beam
Most residential additions in San Antonio use a slab-on-grade foundation with a perimeter beam. For more difficult sites, the engineer may specify post-tension cables embedded in the slab. We install all three foundation types.
Free foundation slab estimates in San Antonio
Foundation work is engineering-first. Call 210-405-7176 or send us your plans for a free, detailed estimate.
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FAQs
Foundation Slabs FAQs
How much does a foundation slab cost in San Antonio?
Our slab-on-grade foundations start at $12 per square foot on a level lot; sloped lots are priced after a site visit. Post-tension foundations are higher, and pier foundations are higher still.
Do I need an engineer for my addition?
Yes. Almost any addition or ADU in San Antonio requires engineered foundation plans for permitting.
Can you pull permits and coordinate inspections?
Yes. We handle the foundation portion of the permit and coordinate inspections required by the city.
How long does a foundation slab take to install?
Most residential addition or ADU foundations take 5 to 10 working days.
How long before we can start framing on a new foundation?
Typically 7 days. The slab needs to reach enough strength to carry framing loads.
Why are San Antonio foundations more complicated than other cities?
Our expansive clay soils move with moisture more than most regions. A foundation that would be perfectly fine in Houston or Dallas may need additional engineering here.
Ready to talk about your foundation slabs san antonio project?
Call us today to schedule a free, no-pressure estimate. We serve San Antonio and the surrounding Texas Hill Country — same standards on every job.
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210-405-7176