Lake County is about to have a data center hiring problem. T5 Data Centers filed plans for T5 @ Chicago IV, an AI-ready campus in the Cornerstone business park along Peterson Road in Grayslake, covering up to 473 acres with as many as 18 buildings and an electrical demand of approximately 1.55 gigawatts. The village issued the first building permit for an 800,000-square-foot facility on September 1, 2026, and the $18 billion project is moving. The talent it needs is not sitting idle in Lake County.

Illinois cost of living, particularly in Lake County's affluent northern suburbs, will push candidates toward the upper end of every range listed above.

For commissioning engineers, look for hands-on experience with high-voltage switchgear, UPS systems, and generator load banks, plus a track record of signing off on integrated system tests. Uptime Institute ATD or a BICSI DCDC credential signals real exposure to data center environments rather than generic mechanical or electrical work. For critical-facilities engineers and technicians, facilities management experience inside a colocation or hyperscale site matters more than any single certificate. Candidates with OSHA 30, Arc Flash training, and direct experience on 480V or medium-voltage distribution systems are the ones who can actually own a shift.

For entry-level facilities technicians, an associate degree or military background in electrical or mechanical systems combined with OSHA 10 is the realistic floor.

For commissioning engineers, relocation assistance is standard. The national candidate pool for this work is small and mobile, and anyone worth placing has options. Budget $5,000 to $15,000 for relocation support and present it upfront. Per diem arrangements work well for commissioning roles that are project-duration by nature. A candidate who is not willing to relocate permanently can still be the right person for a six- to eighteen-month commissioning engagement, and contract-to-permanent structures let the operator evaluate fit before committing to a full-time headcount. For operations roles, permanent placement is the right structure. Critical-facilities engineers and senior technicians need to know they are building something, not just filling a gap. Shift differentials for nights and weekends are expected and should be written into the offer rather than negotiated after the fact.

Commissioning engineers come from the national pool. They follow active build schedules across markets and are best reached through direct outreach to people currently on other data center commissioning projects. Job boards surface some, but the best candidates are already employed. Critical-facilities engineers and senior technicians come from existing colocation and hyperscale sites in the Chicago metro, as well as from the pharmaceutical and industrial complex that has employed precision-maintenance workers in Lake and Cook counties for decades. Entry-level technicians can be sourced locally. Community colleges in Lake County, veterans transitioning out of the military, and workers from the warehouse and logistics corridor already operating around Grayslake are realistic pipelines. For trades during construction, Chicago's union halls are the primary source. IBEW Local 701 covers Lake County for electrical work, and the regional pipefitters and ironworkers locals have staffed large industrial and infrastructure builds here before.

The Chicago metro's union infrastructure is real and relevant. IBEW, pipefitters, ironworkers, and related crafts have staffed large industrial builds across the northern suburbs for years, and a project at this scale will pull from those halls without much trouble for the first wave of work.

The non-obvious problem is the litigation. As of August 2026, a lawsuit filed July 31 in Lake County Circuit Court is seeking to invalidate the 2024-2025 zoning approvals and block further permits. The village issued the first building permit anyway and is treating the project as approved, but the legal uncertainty is real. Contractors and staffing firms working this project need to plan for sequencing flexibility. Crews brought in for the first building may need to shift to other Chicago-area projects if permitting slows or stops on subsequent phases. Multi-market contractors who can flex workers between Grayslake and other active sites in the metro are better positioned than firms that commit headcount exclusively to this campus. The hiring plan has to account for the possibility that phase two is not as close behind phase one as the overall timeline suggests.

The first building permit dropped September 1, 2026, on an 800,000-square-foot facility. Site work starts now. Commissioning on that first building is likely 18 to 24 months out, which means the search for commissioning engineers should start no later than mid-2027, and probably earlier given how thin that talent pool runs. Operations hiring for the first building follows commissioning. Every subsequent building adds another cycle.

At full build, a campus of this size will need hundreds of operations staff across all shifts. That ramp does not happen overnight, and the sourcing pipeline needs to be open well before each building goes live.

NextDCX recruits for your toughest data center roles. Share the work, location, and experience your team needs. We run a fresh search for every role, approach people directly, and speak with every candidate before introducing them. You get people screened for the work, pay, location, and availability, ready to meet your hiring team. We also support recruiting partners. If Grayslake is on your board and you need to account for a litigation-driven schedule that may compress or pause between phases, send us the roles and we start now.

For the buildout, see T5's Illinois Lake County data center filing. Comp sources: ZipRecruiter and dcgeeks 2026 salary data.