Modular and Prefabricated Data Halls in Texas

Texas has over 10,000 miles of railroad track, and three Class I railroads operate about 84 percent of it, which matters to a data center builder for a plain reason: a factory-built power skid or cooling module has to get from the factory to the pad, and the route decides the cost. Modular and prefabricated data halls move the work out of the field and into a controlled shop, where electrical rooms, mechanical skids and even whole halls are assembled and tested before they ship.

The appeal is speed and repeatability. While the site is being graded and the foundations are poured, the modules are being built, so the two schedules run in parallel instead of in sequence. The tradeoff is that the site work has to be ready on the day the modules arrive, to tolerances tighter than a conventional job demands. A pad that is off level or a conduit stub in the wrong place can stop a crane lift worth far more than the fix.

We build the site, the pads, the underground and the interconnections that modules need, and we coordinate the module supplier so that arrival, set and connection go in one pass.

Freight options in Texas are broad. Besides the three Class I railroads, more than 50 shortline railroads operate across the state, and the Port of Laredo handled 213,008 rail cars in 2025, which gives an idea of the volume moving through the border corridor. Trucks carry the rest: the Laredo Economic Development Corporation reports about 14,000 commercial trucks crossing each day between the World Trade Bridge and the Colombia Solidarity Bridge. Not every module travels by rail, but the freight network is part of the supply picture.

For oversize loads the question is the last stretch. Highway clearances, bridge ratings, utility lines and tight turns at the site entrance decide whether a module arrives whole or in pieces. We survey the route before the module is ordered and design the site entrance and internal roads for the heaviest and longest unit. That survey sometimes changes the module's size, which is much cheaper to learn before fabrication than after.

A modular data center can be a complete hall in containers or a set of prefabricated power and cooling skids serving a conventional building. Prefabricated electrical rooms are common in larger campuses because they shorten the interior schedule, and the same logic works for an edge data center, where a single factory-built enclosure on a pad is the whole facility.

Owners choosing between prefabricated and site-built should compare more than the price. Factory work is cleaner and more consistent, but it is less flexible once the design is released. Site-built work is slower but easier to adjust. We help owners test the decision against their own schedule, the supplier's lead time and the number of identical units they expect to buy.

The module schedule includes design release, fabrication, factory testing, shipping and set. The site schedule includes grading, foundations, underground utilities, pad curing and the final conduit and pipe stubs. We build a combined schedule that shows the one date that matters most: the day the module reaches the pad. Everything before it is planned backward from that date, and the pad is accepted by the supplier's representative before the lift.

Weather and crane availability can move that date, so we plan a lift window and a fallback. Large cranes are scarce and expensive, and a missed window costs more than a few days. When the plan includes several modules, we sequence the lifts so that the crane does not have to be set up twice, and we coordinate temporary power so the first units can start factory-acceptance style testing on site.

A module brings its own electrical gear, controls and cooling, and the builder owns the connections. We define each interface in a short document: pad dimensions and tolerances, embedded plates, conduit stub locations, pipe sizes and flanges, grounding connections, and the sequence of testing. The module supplier signs the document, and so do we.

That discipline pays off in the connection phase. Our team knows exactly where each conduit and pipe lands, and the supplier's technicians do not need to improvise. For power skids, the duct banks and service entrances that connect them to the utility are often the longest-lead site item, and for cooling skids the chiller and cooling plant pads need the same level of precision.

Most problems trace to assumptions. A pad poured to the drawing may not match the module as fabricated if the supplier made a late change. A crane may not be able to reach the set location because of an overhead line. A module delivered during a rain may need a protected place to wait. We ask the supplier for the as-built drawings before the pad is poured and verify them against the site, and we plan the lift with the crane contractor and the utility in advance.

Owners with public sponsors also tell us that government and defense operators often prefer factory-tested modules because acceptance testing happens before the unit reaches the site. We document factory and site tests together so the file is complete when the owner takes the unit. Our work on design-build delivery is a natural fit for modular projects, since the module and the site are designed together.

Send the module supplier, the size and weight of the largest unit, and the site address. We will return a route review, a pad and underground scope and a combined schedule that shows when the site must be ready. If you are still comparing prefabricated and site-built options, we can price both.

Does modular always save time?

It saves time when the site work and the module fabrication run in parallel and the design is settled early. It does not save time if the design keeps changing, if the site is not ready on arrival or if the route cannot take the module. We show owners where the time is actually saved before they commit.

Who is responsible if the pad is slightly off?

That depends on the contract, which is why we write the interface document before the pour. It names tolerances, who checks them and who corrects any problem. We survey the pad and share the results with the supplier before the lift, so the pad is accepted before the crane arrives.

How are modules connected to power and cooling?

Through conduit and cable stubs and through pipe connections prepared at the pad. We install them to the supplier's drawings and test them before the module is set. After the module is on the pad, the connections are completed, tested and commissioned in a planned sequence.

Can modules be added later?

Yes, if the site is planned for them. We recommend building the utility service, the pad area and the access route for future modules in the first phase, even if the modules come later. Retrofitting a route or a pad next to running equipment is more expensive than building it once.

What about permits for prefabricated units?

Permits depend on the city and the design. Some cities treat modules as buildings, others as equipment, and local amendments to the building code can change what is required. We confirm the approach with the building department early and plan for any plan review the module needs.