Speculative industrial space from 30,000 square feet to 1.3 million square feet is being planned on a single 164-acre commerce park at the northwest corner of Interstate 10 and Highway 46 in Seguin, according to a July 2026 trade report, and that range is exactly where site contractors earn or lose their margin. A small flex bay and a million-foot cross-dock do not need the same subgrade, the same pavement section or the same utility trunk size. We build for both ends of the range, and we price the overlap carefully so a developer can subdivide a tract without redoing the earthwork.
Seguin sells itself on the highway. The local economic development corporation describes the city as sitting on I-10 about 35 minutes east of downtown San Antonio with more than 4,000 manufacturing jobs inside the city limits. For us that means a steady stream of plant expansions, supplier buildings and parks that need a contractor who can mobilize quickly and work beside live production. We manage grading, concrete and underground pipe, which cuts the number of handoffs on a crowded schedule.
The sections below describe how we approach the specific work Seguin owners tend to need: pads for large shells, floors for heavy assembly, and the water, sewer and storm lines that tie them to the city.
Where Seguin growth is landing along I-10
The Rio Nogales Industrial Park, just south of I-10, is the site of a planned $75 million, 125,000 square foot stainless tube plant on a 33-acre parcel, reported in 2022. Earlier, a 300,000 square foot assembly and warehouse building on a 26-acre tract west of the existing heavy equipment plant was reported for two suppliers. These are different companies with different products, but the buildings are similar: large clear-span shells with trucks on one side, process equipment inside, and a long pad that needs to be flat before steel arrives.
We use that pattern when we scope. A supplier building on an existing campus usually inherits utilities and drainage from the campus, while a first building in a new park may have to bring water, sewer and storm drains from the street. Ask us for a split quote on those two parts if your project is the first lot in a park. For more about the building types that tend to land here, see manufacturing plant and warehouse.
Slabs and pavement for equipment, assembly and storage
A plant floor for welding, assembly or stamping carries concentrated loads and wheel traffic. We typically place 6 to 8 inch reinforced slabs, thicker at press lines, with joint patterns that keep wheel paths off joint edges and with dowels where forklifts cross. Equipment bases get their own pour with anchor bolt layouts checked against vendor drawings. Our industrial concrete floors work covers hardener topping, sealers and flatness testing when a process needs it.
The yard matters as much as the floor. Trailer staging, truck courts and fire lanes need rigid pavement where wheel loads are heavy and flexible pavement where they are not. We grade for positive drainage, pour curb and gutter to control runoff, and install storm inlets and pipe to the plans before paving begins. Dock aprons get thicker sections than ordinary parking, and we explain why in the bid so the estimate does not look inflated.
One crew from mass grading to the last saw cut
Coordinating these scopes means the operators run the scrapers, dozers and motor graders, the pipe team sets the lines, and the finishers place the concrete on one schedule. On a park with several lots under construction, that continuity matters because we know where the benchmarks are, which fill has been compacted to what specification, and where utility stubs end. We rely on mass grading and building pad preparation crews who stay on the job through the pad turnover.
Compaction testing, concrete cylinders and slump checks are scheduled with a third-party lab, and we share the results with the owner and general contractor as soon as we receive them. If a test fails, we fix the area before moving on rather than hoping the next layer hides it.
What drives the cost of an I-10 park lot
Three items move the price more than any others. The first is soil: expansive clay needs lime or cement treatment or undercut and replacement, while sandy loams may need only moisture control. The second is the site utility package, since extending water and sewer to a lot at the back of a park can cost more than the foundation. The third is the pavement, because a truck court sized for heavy trailers uses a lot of concrete.
We recommend a pre-bid review of geotechnical data and the civil plans. If the plans show detention that serves the whole park, we ask who is responsible for building it and who pays. Tying the first lot to shared infrastructure without a written cost split is the quickest path to a change order dispute. We also quote alternates, such as thicker slabs against more joints, so owners can compare on lifecycle cost instead of first cost alone.
Developers, plant owners and city staff
Commercial developers working in Seguin are typically managing partners, lenders and tenant timelines at the same time, so we give them a schedule they can hand to a lender. For plants, we work with maintenance and operations leads on shutdown windows and temporary access. Municipal and public works clients can expect pressure testing, bacteriological sampling and as-built drawings that meet city requirements.
Seguin's location also makes it a logical neighbor for companies already in New Braunfels or San Antonio; we often price all three together when a manufacturer is deciding where to put an expansion.
Start with the park and the pad
Tell us which lot you are considering and we can compare grading, pavement and utility costs before you close on the land. Our site utilities team can also review the street frontage and tell you what a tap or extension might involve.
Common Questions
Can you build to a building shell that has not been designed yet?
We can start with the civil plans and a preliminary geotechnical report. Pads for speculative buildings are often graded to a standard elevation and compacted in lifts, then left for the building contractor to finish. We document what is built so the structural engineer can design foundations with confidence.
How does a million-square-foot floor differ from a 30,000 square foot floor?
Scale changes the placement method more than the slab thickness. A large floor uses laser screeds, multiple crews and careful planning of joint layout and pour sequence to control curling and cracking. Smaller floors may be placed with conventional methods. We explain the difference in the bid so you pay for what the building needs.
What do you need from us before we get a price?
Send us the site plan, grading plan, utility plan, geotechnical report and any pavement design. If the building is not yet designed, send the footprint, the dock layout and the expected truck traffic. We will price what we can and list the assumptions for the rest.
Do you handle city inspections for water and sewer lines?
Yes. We schedule inspections, supply the testing the city requires and fix defects quickly. Final as-built drawings are delivered with the closeout package.
Can you work within an operating plant?
Yes. We plan access, noise windows and dust control with plant staff and keep the site equipment out of production routes. Phasing keeps loading docks and employee entrances open.