San Antonio foundations are slabs and pier and beam, cut into limestone up north and built over clay down south. We dig to the engineer's plans and backfill when the work is done.
Most San Antonio homes sit on slabs or pier and beam foundations, not basements, because rock on the north side and moving clay on the south and east sides make basements costly. Foundation excavation here means cutting a level pad, digging grade beams and footings to the plan depth, and drilling or digging piers where the engineer calls for them. Additions follow the same rules and must tie in to the old foundation.
On clay sites, the soil under the slab is prepared the way the geotechnical report says, which often means removing native clay and replacing it with select fill. On rock sites, beams and footings are cut into limestone or caliche with a breaker. Either way, we follow the plans and the inspector's checks, and we keep spoil away from the open trenches.
For foundation repair crews, we open the ground along existing beams, including under older pier and beam homes in neighborhoods like Alamo Heights and Leon Valley. Digging next to a slab is done in short sections and backfilled promptly. In clay, leaving a beam exposed to sun or rain for days can change how the soil under it behaves. Spoil stays clear of the trench edge.
Foundation excavation in San Antonio: common questions
Can you dig a basement in San Antonio?
It can be done, but rock or expansive clay usually make it expensive. We look at the soil report and the site before pricing it.
How deep are footings here?
The engineer's plans and the local building code set the depth. Soil movement and rock, not frost, usually decide it.
Do you dig for foundation repair companies?
Yes. We open the ground along the beams for repair crews, then backfill and regrade when they are done.
How it works
- Free estimate: Call, text or book online. We walk the site with you.
- Written quote: Scope, equipment and price in writing.
- Utility locate & plan: We have utilities marked and plan access, haul-off and erosion control.
- Dig, grade & clean up: We complete the work, grade the site and haul away spoil.