Drive-unit and battery-module lines ask more of a slab than almost any other occupancy. Loads run through conveyors, test stands and press foundations, and a bay that comes out of tolerance can hold a launch date. We start an automotive or EV plant from the equipment load list and the takt time, then work back to the footing, the floor and the envelope, instead of dropping a generic shell over a process nobody has priced.
The buildings we plan for under this heading are component and module plants: machining and stamping cells, pack and module assembly, end-of-line test, and the receiving docks that feed them. Each has its own flatness requirement on industrial concrete floors, its own draw on electrical service and its own tolerance for downtime. A manufacturing plant built for general production is not automatically right for a line with robotic cells and automated guided vehicles.
What a plant manager gets from us is a sequence, a submittal log and a turnover package that matches the equipment supplier's own requirements. Dates we do not control, such as equipment delivery, are written into the schedule as dependencies, with the building milestones that gate them.
Floors, pits and equipment bases
Floor design for this work starts with who drives on it. Automated guided vehicle paths usually carry a tighter flatness requirement than manual forklift aisles, and the vehicle supplier publishes the number. We take it from their document instead of a rule of thumb and carry it into the pour plan. Joint layout is drawn around equipment bases so saw cuts do not land under a robot cell or a test stand, and we survey flatness after each placement and report the results before the next pour goes ahead.
Press, dynamometer and test-stand foundations are separate structures with their own isolation and reinforcing, and we price them as equipment pads and foundations keyed to the supplier's anchor bolt template. Pits, trenches and conveyor tunnels are cast and waterproofed ahead of the slab so nobody has to core through a finished floor later. Embeds are held to the supplier's drawing and verified by survey before concrete is placed.
Heavy-component manufacturing on the north Front Range
Two Vestas plants in Brighton make wind turbine blades and nacelles, valued at $290 million and providing 1,350 jobs. In February 2021 Vestas announced that Windsor would take over blade production from the Brighton factory, with about 150 added jobs expected there. Blades and nacelles are large, heavy and awkward to move, so the buildings behind them need high bays, wide crane coverage and truck courts that can turn oversize loads. Battery trays, body structures and test chambers make a similar set of demands.
Windsor's Great Western Industrial Park shows the delivery side: a 3,000-acre master-planned park with dual rail interchanges to Union Pacific and BNSF, sites from 5 to 200 acres and buildings from 60,000 to 1,000,000 square feet. A supplier that needs inbound steel or outbound modules by rail can plan around that kind of site. We build in Brighton and Windsor with that logistics picture in view, and we tie the plant layout to the supply chain described on our automotive and EV page.
Electrical service, EV-ready code and utility interconnect
Colorado HB22-1362 requires any county or municipality that updates a building code on or after July 1, 2023 to adopt an energy code at least equal to the 2021 IECC plus the state model electric and solar ready code, and from July 1, 2026 the benchmark becomes the state model low energy and carbon code. Whether those provisions reach a given building depends on the jurisdiction's adoption date, so we confirm the edition and local amendments with the building department before we price, and we draw the charging rough-in and solar-ready roof provisions into the permit set at the start.
The larger item on an EV plant is utility interconnect. Formation equipment, module lines and test chambers draw heavy loads, and a new service means transformer, switchgear and metering that sit on the critical path. We run service applications through permitting and entitlements coordination and size the underground duct bank to the final equipment single-line, not to a placeholder that gets redrawn when the supplier submits.
Expansive clay under a precision floor
The Colorado Geological Survey states that most homes, schools and roads in Colorado are in areas of potentially expansive clay, and that volume increases of 3 percent or more are considered potentially damaging and generally require specially designed foundations. On a precision floor, heave is a tolerance problem before it is a structural one. A quarter inch of differential movement can pull a conveyor out of alignment or put an AGV path outside its flatness band.
Our response is a geotechnical report with swell testing before design, then a choice between overexcavation with moisture-conditioned fill and a structural slab carried on drilled pier foundations with void forms. We set elevation monuments on the slab at turnover so the owner has a baseline for any later movement survey. The more sensitive the equipment, the more we lean toward the structural option.
Equipment set dates and long-lead gear
A production launch date is set by when equipment arrives, and equipment arrives when the building can take it. We work back from the first-line set date: envelope closed, slab cured and surveyed, power energized, crane or overhead conveyor steel complete. Switchgear, transformers and overhead steel carry the longest lead times, so we run them through long-lead procurement management during preconstruction, with release dates written into the schedule.
For a line added to a running plant, shutdown windows govern. Tie-ins to compressed air, process cooling water and power are scheduled into planned downtime with a written switching plan and a back-out step. Commissioning proves each system with the equipment supplier before turnover, and any change to the load list after slab release goes through change control with the cost and schedule impact stated.
Bring us the equipment list
Send the load list, the target set date and the site, and we will return a sequence with the floor, power and long-lead items called out.
Common Questions
What floor flatness should we specify for automated guided vehicle paths?
Use the number from the vehicle supplier's installation requirements, because they set it from the wheel base and sensor tolerance of the vehicle. We carry that figure into the pour plan, choose the placement method to meet it, and survey each placement before the next one starts. Manual forklift aisles and press areas can usually run a looser random-traffic specification, which keeps cost down on the parts of the floor that do not need the tight band.
Can a module assembly line go into a metal building, or does it need a heavier frame?
A pre-engineered metal building can host it if the frame is designed for the actual crane, conveyor and mezzanine loads, which is a different design basis than a standard warehouse package. We get the equipment loads before the metal building supplier sizes the frame, so nobody discovers a hung-load conflict at erection. If the loads are heavy or the bays are tall, structural steel is usually the better fit.
How early should a contractor be engaged ahead of the first equipment delivery?
Early enough to place long-lead electrical gear and complete design review before the slab is released. For a new building that usually means engaging at the site selection stage, because soils, utility capacity and the permit path decide the calendar as much as construction does. For an expansion, the shutdown window is the constraint, and the tie-in plan has to be agreed well before it opens.
Does expansive soil change what a precision floor costs?
It can. Overexcavation and moisture-conditioned fill add earthwork and testing, and a structural slab on piers adds drilling and formwork. The offsetting number is the cost of re-leveling or re-aligning equipment after movement, which is usually larger. We price both options at preconstruction so the owner can compare them against the sensitivity of the equipment going in.
How does HB22-1362 affect an EV plant permit?
It sets the energy code floor for any jurisdiction that updates its building code on or after July 1, 2023, and it raises the benchmark again from July 1, 2026. Cities and counties adopt on their own calendars, so the edition in force depends on where the plant sits and when the application is filed. We confirm that with the building department and design to it, rather than assuming one edition applies statewide.