Concrete companies in San Antonio: contractors, ready-mix plants and how to check them

This report is for builders, developers and property owners hiring a concrete contractor or choosing a ready-mix supplier in the San Antonio area, and for B2B sellers whose customers are concrete firms: equipment, trucks, admixtures, insurance, software and recruiting.

The market in Census data

The figures cover two industry codes in the San Antonio-New Braunfels, TX Metro Area (CBSA 41700): NAICS 238110 (Poured Concrete Foundation and Structure Contractors) and NAICS 327320 (Ready-Mix Concrete Manufacturing). Source: US Census Bureau, County Business Patterns 2023.

Some concrete work sits in other codes and isn't counted here: structural steel and precast concrete contractors (37 more establishments in the metro), concrete product plants such as block and pipe, and many flatwork and foundation repair firms classified elsewhere.

Size and location

The classes above 99 employees are withheld by the Census Bureau to protect confidentiality. In broader bands, 191 establishments have 1 to 19 employees, 41 have 20 to 99, and the remaining 5 have 100 or more: 4 contractors and 1 ready-mix plant, by the industry rows.

Bexar holds 55% of the locations. Comal and Guadalupe counties, home to New Braunfels and Seguin, add 68 more between them.

County Business Patterns counts establishments with paid employees, not companies: a ready-mix producer with six plants counts six times, and an owner-operator finishing crew with no payroll doesn't count. Employment is a snapshot of the week of March 12, 2023.

The plants, from state permits

Ready-mix plants, concrete product plants and their associated facilities that discharge process wastewater or stormwater need coverage under the Texas Commission on Environmental Quality's general permit TXG110000. TCEQ publishes the active authorizations as open data. In the metro's eight counties, as of 25 October 2026:

The largest holders in the TCEQ data are Alamo Concrete Products (10 authorizations) and Smyrna Ready Mix (9), followed by Tex Mix Partners and Cemex (4 each). The list includes block and precast plants as well as ready-mix, and a plant with no discharge may not appear, so treat it as a strong starting list rather than a census. Air permits for batch plants are a separate TCEQ program.

What city permits show

The City of San Antonio publishes issued permits as open data. Four types are mostly concrete work. For 2025:

Foundation repair is concentrated: 12 primary contacts filed 1,721 of the permits (57%), and 42 contacts with ten or more filed 2,380 (79%). The contact field holds a person's name, often with the company after it, so one firm can appear under several contacts.

Licenses: what the city checks and what it doesn't

Texas has no state license for concrete contractors, so the rules that apply are the city's:

How to choose a concrete contractor

1. Specify the concrete, not just the job: strength (in psi), slab thickness, reinforcement and finish, so every bid prices the same thing.
2. Check the city record. Search the contractor in the city's Find a Contractor tool for registered work, and in the permit data for its recent jobs.
3. Ask who supplies the concrete and from which plant. A plant across the metro adds haul time in summer heat.
4. Get insurance certificates naming you, and for commercial work a bonding letter from the surety.
5. Check the quantities yourself with the arithmetic below, then see two finished jobs at least a year old.

Worked example: checking a slab quote

Illustrative example. The project, prices and percentages are invented to show the arithmetic.

A Medina County ranch owner gets two quotes for a 40 by 60 foot shop slab, 5 inches thick. Volume: 40 × 60 × (5 ÷ 12) = 1,000 cubic feet, or 37.0 cubic yards (1,000 ÷ 27). With 5% for waste and uneven subgrade, that's 38.9, so about 39 yards.

Quote B looks $1,140 cheaper, but 34 yards, less the same 5% waste, covers a slab only about 4.4 inches thick. Either the contractor plans to run short, or the slab won't be 5 inches. Ask both to state the thickness and yardage in writing.

Selling to San Antonio concrete companies

Ready-mix producers buy for plants and fleets: mixer trucks, parts, admixtures, dispatch software, and drivers above all. Contractors buy pumps, forming, rebar, finishing equipment and estimating help. Build the plant list from the TCEQ data and the contractor list from city permits, then add the owner or plant manager at each. Bebop can find concrete firms that match a description like this and research each account; see how to find decision makers for the contact step.

Illustrative example. A CDL training school (hillcountrycdl.example) targets the 44 operators in the TCEQ list. Two contacts each, the plant or operations manager and HR, is 88 people; a 10% reply rate gives about 9 conversations, and two sponsorship deals at 6 drivers a year and $4,500 per driver is $54,000 a year.

Subject: Mixer drivers for your [county] plants

Hi [first name],

[Company] runs [number] concrete plants around San Antonio, by the state's permit list, and every one of them needs CDL drivers who can handle a loaded mixer.

We train drivers on mixer trucks specifically and place them with sponsoring producers within [weeks].

Would a short call about sponsoring two trainees for spring be useful?

[Your name]

Local sources

Next step: for the wider builder market these firms serve, read the report on construction companies in San Antonio.