> This is the markdown version of https://www.classet.ai/blog/data-center-construction-staffing-ramp-plans > Learn more at https://www.classet.ai ![Low-poly illustration of a rising and falling faceted curve over a construction site grid with crane lines](/_next/image?url=%2Fimages%2Fblog%2Fdata-center-construction-staffing-ramp-plans.png&w=3840&q=75) # Data Center Construction Staffing: Ramp Plans for the Electrician Peak How to plan data center construction staffing phase by phase: the headcount curve from civil through commissioning, when to open reqs, how to keep a bench warm between phases, and why the first conversation with each applicant decides the schedule. [![Paul Jones](/_next/image?url=https%3A%2F%2Fassets.basehub.com%2Fe0b5701f%2F6599306507912123f90f150a8bfaaf6c%2Fscreenshot-2026-01-28-at-10.53.16-am.png%3Fwidth%3D100%26height%3D100%26quality%3D100&w=96&q=75) Paul JonesHead of Growth at Classet ](/blog/authors/paul-jones) August 26, 2026 Skilled Trades, Guides & Insights Every data center schedule has the same shape: a slab, a shell, then a wall of electricians and pipefitters that shows up in month six and disappears in month fourteen. The contractors who hit their energization date are the ones who planned the wall, opened the reqs before the slab cured, and kept the crew warm through the gap to the next hall. The ones who miss it treated staffing as something that starts when the conduit arrives. This is a phase-by-phase plan for data center construction staffing, written for general contractors and MEP subcontractors. The headcount numbers are sourced where a source exists and described qualitatively where one does not, because a published headcount-by-phase curve from a major builder turned out not to exist when we went looking. Quick answer Data center construction staffing is the practice of matching crew size to a four-phase headcount curve: civil and site work, structural and shell, MEP rough-in, then commissioning, across roughly 12 to 24 months per building. Headcount stays low through civil, climbs through structural, and peaks during MEP rough-in, when electricians dominate the site because the IBEW puts electrical work at 45 to 70 percent of a data center's construction budget. Virginia's JLARC study puts a single building at about 1,500 workers at peak; Leopard Project Controls figures cited by iRecruit put hyperscale campuses at 3,000 to 3,500. Commissioning then tapers the crew to a small team of controls technicians and test engineers. Three actions follow: open electrical requisitions when the slab is poured, screen applicants the same day, and overlap the next building's underground work to hold a core crew. ## The curve, phase by phase Trade and recruiting sources agree on the sequence and roughly on the durations. Broadstaff's [construction timeline](https://broadstaffglobal.com/data-center-construction-timeline) and iRecruit's [greenfield-to-RFS breakdown](https://www.irecruit.co/insights/data-center-construction-timeline-greenfield-to-rfs) both put site selection at three to six months, design at six to twelve, permitting at six to eighteen, construction (civil, shell, MEP) at twelve to twenty-four, and testing and commissioning at three to six. Virginia's JLARC [study](https://jlarc.virginia.gov/landing-2024-data-centers-in-virginia.asp) found individual buildings usually take twelve to eighteen months and carry about 1,500 workers on site at peak. **Civil and site (months 0 to 3).** Grading, utilities, foundations, the substation pad. Operators, laborers, concrete crews. Headcount is a fraction of peak, and the trades are ones the general market has. The staffing risk here is low, which is exactly why the electrical reqs should already be open. **Structural and shell (months 2 to 7).** Steel or precast, roof, envelope, the raised floor or slab-on-grade. Ironworkers, carpenters, roofers. Headcount climbs. This is when the electrical and mechanical contractors mobilize for underground and in-slab work, and when the first medium-voltage crews start on the substation and campus loop. **MEP rough-in (months 5 to 13).** The peak. Switchgear, transformers, UPS rooms, generator plants, busway, cable tray, chilled-water piping, CRAH units. The IBEW puts electrical work at [45 to 70 percent](https://ibew.org/electrical_worker/the-data-center-surge-a-new-generation-of-ibew-jobs/) of a data center's construction budget, and this is the phase where that shows up as people. Data Center Frontier [profiled](https://www.datacenterfrontier.com/sponsored/article/55242648/views-from-the-ground-electrical-contractors-building-data-centers-weigh-in) a Loudoun County job with more than 250 electricians and 60 to 70 apprentices under one general foreman; the IBEW cites a Frederick, Maryland site expecting 1,000 workers with a peak "double that. Or triple." iRecruit, citing Leopard Project Controls, puts hyperscale peak workforces at 3,000 to 3,500, "concentrated in electrical fit-out and commissioning." Pipefitters, HVAC mechanics, and fire protection ride the same curve a few weeks behind the electricians. **Commissioning (months 12 to 18).** Level 1 through Level 5: factory tests, site acceptance, system startup, integrated systems testing under simulated failure. Headcount falls sharply and the mix changes: fewer journeymen, more controls technicians, test engineers, and the electricians who know switchgear well enough to work alongside the commissioning agent. The crew is small and the schedule risk is large, because a hall waiting on one controls technician is a hall not earning revenue. ## What the peak costs when it is late The reason to plan the curve is the penalty behind it. STL Partners [modeled](https://stlpartners.com/press/delays-in-data-centre-construction/) a 60 MW facility and found each month of delay costs the developer about $14.2 million in lost lease revenue, cost overruns, and contractual penalties, dragging the project return from 17.1 percent to 12.6 percent after three months. The GC and MEP subs carry a share through liquidated damages. Being 40 electricians short in month eight is not a staffing inconvenience. It is the reason the owner's rep is in your trailer. And the crews are short everywhere. ABC's July 2026 [backlog indicator](https://www.tileletter.com/abcs-construction-backlog-indicator-plummets-in-july/) found contractors on data center work carrying 11.4 months of backlog against 7.5 for everyone else, which means every MEP sub in the market is planning the same peak with the same journeymen. Our running tally of the [data center labor shortage](/blog/data-center-labor-shortage-2026) has the numbers by trade. ## When to open reqs A phase ahead. The rule that works: post the electrical and mechanical reqs when the foundation is poured, not when the shell is dried in. Rough-in headcount peaks four to six months after civil starts, and in this market a journeyman who applies takes about a week to accept somewhere, so a req opened when you need the bodies is a req that fills with whoever the other bidders passed on. Opening early creates a different problem, which is holding people you cannot put to work yet. Three tactics handle it. Give applicants a real start window in the posting ("crews mobilize the week of March 9") so the ones who apply are the ones who can wait. Use the early weeks for underground, in-slab, and substation work that absorbs a smaller crew productively. And screen applicants the day they apply, so the bench you are building is a bench of people you have already talked to, not a folder of resumes that will be stale by mobilization. That last one is the piece most ramp plans get wrong. Our data across trades hiring shows 55 percent of applications arrive outside business hours and 88 percent of candidates complete a phone screen within 20 minutes when the call comes right away. An electrician who applied at 8pm in January and got a call from Joy that night, answered questions about license, medium-voltage and switchgear experience, travel and per diem, and heard a start window, is attached to your project. One who applied and heard nothing until the recruiter's Thursday callback took the offer from the campus next door. ## Keeping the bench warm between phases Campuses are built in halls, and halls come in phases: the crew that finishes rough-in on Building 2 in October is the crew you want on Building 3 in February. The gap is where you lose them, because a journeyman with a four-month hole takes the next call. Three things close it. First, sequence the phases so the electrical peak on one hall overlaps the underground and in-slab work on the next, which keeps a core crew billing. Second, publish the campus schedule to the crew: "Building 3 rough-in starts February 16, same rate, same per diem" is a retention plan. Third, keep the screened bench in your ATS with the recording and summary attached, so when February comes you call the 40 electricians you already interviewed instead of reopening the req to strangers. Whether that ATS is Greenhouse, Workday, Lever, Bullhorn, iCIMS, or Classet's built-in candidate management, the point is that the bench is yours, not an agency's. The seasonal version of this problem, where contractors lose crews to the winter gap, is one we covered in the [construction seasonal hiring guide](/blog/construction-seasonal-hiring-guide-contractors); the data center version has the same shape with bigger numbers. ## A ramp plan on one page Phase Months (typical) Headcount Trades Staffing action Civil and site 0 to 3 Low Operators, laborers, concrete Open electrical and mechanical reqs; start screening Structural and shell 2 to 7 Climbing Ironworkers, carpenters, roofers; first MV crews Mobilize underground and substation crews; publish the rough-in start window MEP rough-in 5 to 13 Peak; ~1,500 per building, 3,000 to 3,500 on hyperscale campuses Electricians (45–70% of budget), pipefitters, HVAC, fire protection Screen applicants same day; superintendent calls back within 24 hours; sequence next hall's underground to overlap Commissioning 12 to 18 Falling; specialized Controls, commissioning, switchgear-fluent electricians Recruit controls techs early (they are the scarcest); hold core electricians through IST Gap to next hall Varies Core crew only Publish next start date and rate; call the screened bench first Sources for the durations and headcounts are linked above; the actions are what our data center customers do. The version of this for the operators who take the hall after you energize it is on the [data center hiring page](/use-cases/data-centers), which covers both sides of the fence. ## Common questions How many workers does a data center construction project need? About 1,500 workers on site at peak for a single building, according to Virginia's JLARC study, with hyperscale campuses reaching 3,000 to 3,500 per Leopard Project Controls figures cited by iRecruit. The peak lands during MEP rough-in, when electricians dominate the site because the IBEW puts electrical work at 45 to 70 percent of a data center's construction budget. Data Center Frontier profiled one Loudoun County job where a single general foreman ran more than 250 electricians alongside 60 to 70 apprentices. Campus totals run far higher: Fayette County put QTS Fayetteville at roughly 8,000 workers at peak, and the Stargate campus in Abilene, Texas is reported at around 9,000 construction jobs. How long does data center construction take? Twelve to eighteen months per building from the first shovel to energization, according to Virginia's JLARC study, within a broader 12-to-24-month construction window in trade estimates from Broadstaff and iRecruit. Testing and commissioning adds another three to six months on top, running Level 1 factory tests through Level 5 integrated systems testing under simulated failure. The work before construction is longer than most hiring plans account for: site selection runs three to six months, design six to twelve, and permitting six to eighteen, so a campus announced today may not need its electrical peak crew for two years. That lead time is the argument for opening requisitions a phase early rather than treating staffing as something that starts when the trade shows up. When should a contractor start hiring for a data center build? A phase ahead of need, which in practice means opening electrical and mechanical requisitions when the foundation is poured rather than when conduit arrives on site. Rough-in headcount peaks four to six months after civil work starts, and journeymen in this market accept offers within days of applying, so a requisition opened at the moment of need fills with whoever the other bidders passed on. Three tactics make early posting work: state a real start window such as "crews mobilize the week of March 9" so applicants who can wait self-select, use the early weeks for underground, in-slab, and substation work that absorbs a smaller crew productively, and screen each applicant the day the application lands so the bench at mobilization consists of people already interviewed rather than stale resumes. What is data center construction workforce management? Planning headcount by phase, opening requisitions ahead of each peak, sequencing halls so core crews stay billing through gaps, and keeping screened candidates attached to the project in your ATS. It is the difference between hitting the energization date and paying liquidated damages against STL Partners' $14.2 million per month of delay. How do you keep a construction crew between data center phases? Three tactics close the gap between buildings on a campus. First, sequence the phases so the electrical peak on one building overlaps the underground, in-slab, and substation work on the next, keeping a core crew billing rather than idle. Second, publish the campus schedule in specifics, because "Building 3 rough-in starts February 16, same rate, same per diem" functions as a retention plan; a journeyman facing a four-month hole takes the next call instead. Third, keep the screened bench inside the contractor's own ATS, with a summary and recording on each candidate record in Greenhouse, Workday, Lever, Bullhorn, iCIMS, or Classet's built-in candidate management, so February opens with calls to 40 electricians already interviewed. Kelly reports 25 percent annual turnover across data center staff, and a cold bench compounds that churn. ## Key points - The curve runs civil, shell, MEP rough-in, commissioning over 12 to 18 months per building, with the peak in rough-in. - Peak is about 1,500 workers per building (JLARC) and 3,000 to 3,500 on hyperscale campuses; electricians dominate because electrical is 45 to 70 percent of the budget. - A one-month delay on a 60 MW facility costs about $14.2 million (STL Partners); data center contractors already carry 11.4 months of backlog (ABC). - Open reqs when the slab is poured, publish the start window, and screen each applicant the day they apply. - Keep the bench warm between halls by overlapping phases, publishing the next start date, and calling screened candidates from your own ATS first. ## Next steps If your next rough-in peak is inside six months, [see how Joy screens applicants the day they apply](/demo), or start with the ramp section of the [data center hiring page](/use-cases/data-centers). [![Paul Jones](/_next/image?url=https%3A%2F%2Fassets.basehub.com%2Fe0b5701f%2F6599306507912123f90f150a8bfaaf6c%2Fscreenshot-2026-01-28-at-10.53.16-am.png%3Fwidth%3D100%26height%3D100%26quality%3D100&w=128&q=75) Paul Jones Head of Growth at Classet Paul comes from an operator background running an Alpine-owned company, and brings firsthand experience with the hiring challenges Classet was built to solve. He's driven by a belief that the right technology can make meaningful work more accessible. ](/blog/authors/paul-jones) Follow Classet in Google Add classet.ai as a preferred source and our hiring research is more likely to show up in your Top Stories and AI Overviews. 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