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We install concrete foundations and footings in San Antonio, TX that provide solid support for your home or addition. Our team excavates to the right depth, sets accurate forms, installs steel reinforcement, and pours concrete foundations that meet local building codes. From spread footings to stem walls and monolithic slabs, we focus on strength and long term stability.
Mission Concrete San Antonio provides professional concrete foundations throughout San Antonio, TX, Texas and the surrounding area. Our licensed, insured crew delivers safe, clean, on-time work with a free estimate before anything begins. Call (726) 232-6856 or request your free quote.
Concrete foundations built for San Antonio soil and weather
When you hire Mission Concrete San Antonio for concrete foundations, you are getting a team that works with our local soil and climate every day. San Antonio has a mix of expansive clay and caliche that swells when wet and shrinks when dry. If your foundation design does not account for that movement, you will see cracks, sticking doors, and uneven floors long before you should.
Our first step is always a site visit. We look at your lot elevation, drainage patterns, nearby trees, and the age and condition of any existing structures. For new construction, we review your plans and coordinate with your builder or engineer. For additions, garages, shops, and accessory dwelling units, we measure tie-in points, check how your current slab is performing, and talk through how you use the space. That tells us if you need a standard slab-on-grade, a thickened-edge monolithic slab, or a foundation with deeper footings or piers.
San Antonio codes are specific about foundation thickness, rebar size, and footing depth, especially for habitable structures. We are familiar with city and county requirements, as well as common HOA expectations on the North Side, West Side, and far East Side subdivisions. We design and build concrete foundations that pass inspection the first time, but more importantly, we focus on what will hold up over decades in our hot, dry summers and sudden heavy rains.
Whether you are putting in a small workshop off Bandera Road or a custom house outside 1604, our goal is the same. Give you a flat, stable, properly reinforced concrete foundation that supports the structure above and protects you from avoidable movement and expensive repairs later.
How we install concrete foundations and footings step by step
A solid concrete foundation comes from many small details done correctly. Here is what you can expect from Mission Concrete San Antonio on a typical slab foundation with footings.
Layout and excavation: We start by staking out your footprint based on your plans and setbacks. Then we excavate for the slab and dig footings along the perimeter and under load-bearing walls. In most of San Antonio, that means going deeper where we hit clay pockets so the footing bears on more stable soil. We also rough in plumbing trenches when we coordinate with your plumber.
Soil preparation and base: We compact the native soil, then place a layer of base material, usually crushed limestone or flex base, and compact that as well. This step is critical in our area, because the base helps spread loads and reduces how much seasonal soil movement transfers into the concrete.
Formwork and footings: We build wood or metal concrete forms to define the edges and elevations of your slab and footings. Footings are made wider and deeper than the slab, and we tie the footing reinforcement together with the slab steel. For garages, shops, and driveways that will see vehicle loads, we may use thicker footing beams and add dowels at entry points.
Reinforcement and moisture barrier: Before we pour, we install rebar or structural mesh according to the engineered design. Typical residential slabs in San Antonio use #3 or #4 rebar on a grid, with extra steel in footings and around concentrated loads like columns or heavy equipment pads. We also install a vapor barrier under the slab, usually 6 mil or 10 mil poly, to reduce moisture transmission and help control slab curling and interior humidity.
Pouring and finishing: We schedule the pour for cooler hours when possible, because San Antonio heat accelerates concrete set times. We place the concrete, vibrate or rod around rebar and in the footings to eliminate voids, then strike off and screed to the correct elevation. For interior slabs, we usually provide a smooth trowel finish. For garages, patios, and workshops, many clients choose a light broom finish for better traction.
Curing and quality checks: Proper curing is the step many skip, but it matters in our climate. We may use curing compounds or keep the slab damp during the first days to reduce rapid moisture loss and shrinkage cracking. We walk the slab with you, check elevation, control joint placement, and surface quality. If you are planning flooring like tile or epoxy, we talk through any additional prep that might be needed once the concrete reaches its design strength.
Foundation and footing options that fit your project
Not every property in San Antonio needs the same type of concrete foundation. At Mission Concrete San Antonio, we take time to match the design to your structure, soil, and budget.
Standard slab-on-grade: This is common in most subdivisions like Stone Oak, Alamo Ranch, and areas near Loop 410. It works well for one and two story homes, garages, and shops when the soil is properly prepared. We can thicken the slab edges and include interior beams to handle heavier loads or moderate soil movement.
Monolithic slabs with thickened footings: A popular option for detached garages, metal buildings, and workshops, especially on the outskirts of town where inspections may be handled at the county level. The slab and footings are poured all at once, which can reduce cost and speed up the schedule. We still reinforce the footing areas more heavily and adjust depth based on local soil.
Spread footings and stem walls: For sloped lots in areas like Northwest San Antonio or near the Hill Country edge, a spread footing with a short stem wall can make more sense than trying to cut the entire site flat. Stem walls help create a level platform for your slab and keep wood framing higher above grade, which is useful in areas with heavier runoff.
Piers with grade beams: On sites with very active clay or where you are adding a second story to an older home, your engineer may specify piers tied together with concrete grade beams. This system transfers loads deeper, below the more active surface soils. We coordinate with drillers, install the rebar cages, and pour the piers and beams to match the engineering details. It costs more up front but can significantly reduce long term movement in challenging soils.
Thickened pads and machine footings: If you are installing heavy equipment, car lifts, or large masonry fireplaces, we can integrate thickened pads or isolated footings into your slab. We work from equipment specs to get the thickness, reinforcement, and footing size right so you do not have slab failures around high point loads.
What affects the cost of concrete foundations in San Antonio
Concrete foundation pricing is not one-size-fits-all. When Mission Concrete San Antonio puts together a quote, we explain the main cost drivers so you can see where your money is going and where you have options.
Soil conditions and site access: Deeper footings, extra base material, or additional compaction time are common when we encounter very soft or highly expansive clay. Tight backyards in older neighborhoods like Beacon Hill or Woodlawn Lake may require smaller equipment and more hand work, which affects labor. Easy access on newer, open lots can bring your costs down.
Foundation type and thickness: A simple slab-on-grade for a small garage will cost less per square foot than a pier and beam system with grade beams and multiple interior footings. Increased slab thickness, extra beams, or thicker footings for heavy loads will increase the concrete and steel required.
Rebar and engineering: The more reinforcement and the tighter the spacing, the more material and labor is involved. Engineered foundations, which are common for custom homes or multi story additions, require us to follow a specific rebar schedule and footing design. We welcome engineered plans because they help ensure performance, but they often cost more than basic, non engineered slabs.
Utilities and add-ons: Integrating plumbing, electrical conduit, or sleeves for future utilities before the pour takes coordination with your other trades. While this is more efficient than cutting the slab later, it adds time to the layout phase. Options like thicker edge turn-downs for roll-up doors, integral curb walls, or foundation blockouts for showers or floor drains also affect cost.
Finishing requirements and schedule: A standard trowel or broom finish is straightforward. If you need a very flat slab for specific flooring, or you have a tight timeline that requires multiple smaller pours and more mobilizations, that will impact the total price. We are transparent about how changing scope or schedule may affect your budget so you can make informed decisions before we start.
Local tips before you hire a concrete foundation contractor
If you are planning concrete foundations in San Antonio, there are a few things we always tell homeowners and builders during our first conversation.
Get an evaluation of your soil conditions: For larger projects, especially new homes and major additions, investing in a geotechnical report or at least having an experienced contractor inspect your soil can save you a lot of trouble. Our team at Mission Concrete San Antonio looks for signs like existing foundation cracks nearby, standing water after rain, tree root patterns, and past fill dirt. This helps determine whether you can use a standard slab or should talk with an engineer about piers or beefed-up footings.
Ask how drainage will be handled: A good foundation is not just about concrete thickness. San Antonio downpours can overwhelm flat lots. Plan for at least a slight slope away from the slab, plus gutters, swales, or French drains if needed. We routinely build in small elevation adjustments and recommend simple grading changes during the foundation phase instead of leaving water issues to surprise you later.
Check rebar, thickness, and joint layout before the pour: A trustworthy contractor will be happy to show you the reinforcement, footing dimensions, and control joint plan before placing concrete. We walk customers through the layout, explain where we put extra steel, and show how joints will help control where shrinkage cracks appear.
Confirm permits and inspections: Inside San Antonio city limits, most new structures and major additions with concrete foundations require permits and inspections. We can coordinate with your builder or handle the process on smaller projects, and we build to meet or exceed local code. If your project is in the county or an ETJ, we still follow sound engineering practices even when inspections are lighter.
Plan for what happens after the pour: Your foundation is the base for everything else, so schedule framers, plumbers, and other trades with enough cure time built in. We can advise you on when it is safe to load the slab, move in heavy materials, or install anchors. We also talk about future options like epoxy coatings, sealers, or insulation needs if you plan to condition the space later.
If you would like us to look at your plans or walk your property, Mission Concrete San Antonio offers on-site consultations where we discuss foundation and footing options specific to your location, structure type, and long term plans for the property.
