TL;DR
Data center construction schedules are set by power, not by the building. Transformers can take 18 months to three years to arrive. Switchgear often takes a year. Owners who sign a utility agreement late turn a 24 month plan into a 36 month one. The shell is rarely the problem.
Why Is Data Center Building Booming Right Now?
AI workloads changed the demand curve. Census Bureau figures put private spending on these facilities in the United States at roughly $30B a year, about double the level of late 2022.
Hyperscale capital spending also passed $240B in 2024, a 44% jump in a single year, according to Synergy Research Group. The category then grew large enough that official statistics changed to track it. The Census Bureau construction spending survey now reports a dedicated data center line under private office construction. Monthly estimates run back to 2014. Government statisticians do not add categories for small markets.
Space still stayed scarce through the buildout. CBRE research put vacancy in primary markets at 1.9% in 2024. Pricing for 250 to 500 kilowatt requirements also rose sharply: up 14.5%, then 18.6%, then 12.6% across three straight years. That reversed a decade of steady declines.
How Long Does a Data Center Take to Build?
Between 18 and 30 months for a standard build. Hyperscale campuses take 24 to 36 months.
Small edge sites move faster, often opening 8 to 12 months after groundbreaking.
| Facility size | Total timeline | Construction portion |
|---|---|---|
| Edge, 1 to 5 MW | 8 to 12 months | 5 to 8 months |
| Mid-size, 5 to 15 MW | 12 to 18 months | 8 to 12 months |
| Large enterprise, 15 to 30 MW | 18 to 24 months | Varies |
| Hyperscale building, 30 to 60 MW | 20 to 30 months | 14 to 22 months |
| Hyperscale campus, 100 MW+ | 24 to 36 months | 18 to 30 months |
Those ranges have also been stretching. JLL puts the average hyperscale campus phase at about 22 months from groundbreaking to first power-on, roughly 15% longer than in 2023. Grid interconnection queues are the reason. Fully redundant Tier III and Tier IV facilities sit at the top of every range, specifically because their commissioning scope is far larger.
Phased delivery is how large campuses manage that. Instead of waiting for an entire site, owners commission buildings in sequence. Early capacity then earns revenue while later structures are still being fitted out.
What Actually Sets the Schedule?
Long-lead electrical equipment does. The building shell is rarely the constraint.
Concrete, structural steel, and envelope work run on predictable durations that experienced crews control. Current lead times tell the real story:
- Large power transformers: 18 months to more than three years.
- Medium and low-voltage switchgear: around 12 months or longer.
- Generators, UPS systems, and batteries: commonly 12 to 18 months.
- Chillers and major cooling plant: typically 12 to 18 months.
Switchgear ordered in month four may not land on site until month sixteen. Nothing energizes without transformers and switchgear. Hence that single 40 to 60 week wait explains why projects run 18 to 36 months, rather than the 12 months owners sometimes promise their boards.
What Are the Project Phases?
Five, and they overlap in practice. First, site selection and feasibility take 3 to 6 months.
That work covers land, zoning, environmental limits, and early utility conversations about available capacity. Design and engineering follow over 6 to 12 months. This is also when long-lead items get specified and ordered. A slow design phase therefore pushes every downstream date.
Permitting and approvals next need 6 to 18 months, depending on jurisdiction. Developers usually overlap permitting with design. Still, there is a limit to how much work can proceed while legal authorizations are pending.
Site work, shell, and core then run 10 to 24 months. Grading, foundations, structural frame, and envelope come first. Switchgear, transformers, generator yards, UPS rooms, and cooling plant follow. Finally, testing and commissioning close the project over 3 to 6 months. That includes simulated power failures, integrated load tests, and acceptance testing on major equipment.
Why Do Utility Agreements Matter So Much?
Without a signed power agreement early, a 24 month schedule is fiction. Utilities need long lead times to plan substations and upgrade transmission.
They also need time to expand distribution for loads this concentrated. Utilities, consequently, now set the pace for the whole sector. A DOE report on electricity demand examines how sharply these facilities are increasing load. Meanwhile, interconnection queues for large industrial loads keep growing, as utilities juggle renewables, manufacturing, and electrified transport at once.
Developers now sign memoranda of understanding with utilities before final site selection. Gigawatt-scale campuses feel this hardest. Transmission upgrades alone can stretch past two years before construction finishes.
What Does AI Rack Density Change?
It changes the mechanical scope more than the structural one. GPU-heavy racks can exceed 40 to 60 kilowatts each.
Traditional air-cooled rooms with raised floors were never built to handle that. Density therefore pushes designs toward chilled water systems and evaporative cooling. Some facilities also adopt direct liquid cooling to the chip, or immersion cooling. Chillers and cooling towers thus become long-lead items requiring coordinated civil and mechanical work, instead of equipment ordered late in the build.
Networking scope grows in parallel. Connecting thousands of GPUs in one tightly coupled cluster requires high-capacity fiber and dense cable routing. It also requires duct banks and trenches between buildings. On hyperscale campuses, that civil work sits on the critical path alongside the electrical scope.
Flexibility has additionally become a design requirement of its own. Hardware generations turn over quickly. Owners increasingly ask for adaptable power and cooling distribution, rather than a layout tuned to one generation of equipment.
Where Is Data Center Construction Moving?
Into secondary markets, and power availability is driving the shift. Notably, Atlanta recorded the most net absorption of capacity in 2024.
That was the first time any market has passed Northern Virginia on that measure, according to CBRE data center research. Under-construction capacity grew sharply across several regions:
- Atlanta: up 195% year over year.
- Chicago: up 125%.
- Northern Virginia: up 116%.
Vacancy also fell in Houston, Southern California, and the Charlotte and Raleigh corridor. Meanwhile, construction surged around Charlotte, Raleigh, Austin, and San Antonio. Operators are chasing scalable power, workable land economics, and predictable permitting. Regions with grid headroom therefore win projects that once defaulted to established hubs. We track this closely through our USA operations.
What Do These Projects Do to Local Construction Markets?
They absorb skilled trades quickly. A single hyperscale campus draws electricians, millwrights, pipefitters, and controls technicians.
Those crews get hired away from every other job site in the region. The announced figures give a sense of scale. For example, AWS campuses in Pennsylvania are projected to create roughly 1,250 high-skilled permanent roles, plus thousands more in construction. A separate North Carolina campus is expected to add at least 500 high-skilled positions.
Permanent headcount still understates the construction impact. Peak crews on these builds run far larger than the operating staff. They also arrive for a defined window, which strains local labour markets, accommodation, and subcontractor capacity.
Owners planning other industrial work nearby need to account for that competition. When a major campus breaks ground, trade rates rise and availability tightens. Schedules built on historical productivity assumptions consequently tend to slip.
What Does This Mean for Industrial Owners?
The lesson travels well beyond data centers. Any power-dense industrial facility now faces the same equipment queues and utility timelines.
That includes processing plants, compressor stations, and mine sites across the industries we serve. We have seen this pattern on remote industrial projects for years. The transformer and the access road dictate the schedule long before anyone erects steel. The discipline that protects a date is straightforward:
- Order long-lead electrical equipment during design, not after permits clear.
- Start utility conversations before the site is finalized.
- Sequence the shell so mechanical and electrical rough-in never waits on envelope work.
- Build commissioning time into the contract, instead of compressing it at the end.
Owners who treat procurement as a construction activity keep their dates. Owners who treat it as paperwork lose a year. Similarly, labour planning in remote locations needs booking on equipment timelines rather than construction timelines.
Where Does Steel Fit in a Power-Driven Schedule?
Steel is the part of the schedule you can still control. Pre-engineered and structural steel systems go up quickly and predictably.
That matters more when other trades are hostage to equipment deliveries. Fast, reliable shell delivery also creates float. When the frame and envelope finish early, crews get clean, weather-tight space the moment their gear arrives. Teams then avoid losing weeks to sequencing conflicts. On projects like the Mayo B Powerhouse, that overlap between structure and heavy electrical installation is where schedules are won.
Modular and prefabricated assemblies extend the same logic. Building skids and equipment rooms offsite compresses the critical path without adding risk. It also reduces the skilled labour needed in remote or constrained locations.
Overall, the physical building is no longer the hard part of these projects. Power procurement, utility coordination, and equipment scheduling decide whether a facility opens on time. Ultimately, those decisions get made in the first six months of a project, not the last six.