Virginia's Data Center Corridor — 25 Million Square Feet and Growing

The Capital of the Cloud

Northern Virginia is not just the largest data center market in the United States. It is the largest data center market in the world, and it is not particularly close. With over 25 million square feet of operational data center space and billions of dollars in additional capacity under construction, the region known as Data Center Alley has become the physical foundation of the American internet.

For the construction industry, Virginia's data center corridor represents the single largest concentrated market opportunity in commercial building. The projects are enormous, the budgets are measured in billions, and the pipeline of future work extends at least a decade into the future. But the market is also fiercely competitive, increasingly constrained by power availability, and subject to local political dynamics that can accelerate or derail projects worth hundreds of millions of dollars.

This article provides a comprehensive overview of Virginia's data center construction market — where the projects are, who is building them, what they cost, and the power crisis that is both constraining growth and pushing the industry into new territory.

The Scale of What Exists

Northern Virginia's dominance as a data center market traces back to the earliest days of the commercial internet. The region's proximity to major fiber-optic trunk lines (many of which follow the Interstate 66 and Dulles Toll Road corridors), its relatively low natural disaster risk, and its large pool of technical talent made it a natural home for the internet's physical infrastructure.

Today, the market has grown far beyond its origins. According to CBRE's latest market assessment, Northern Virginia hosts approximately 3.5 gigawatts of operational data center power capacity, distributed across more than 25 million square feet of purpose-built facilities. The major operators include:

Amazon Web Services — the largest single operator in the market, with multiple campuses across Loudoun and Prince William counties totaling well over 5 million square feet
Microsoft Azure — major campuses in Loudoun County and Boydton, Virginia (in southern Virginia), with significant expansion underway
Google Cloud — growing presence in Loudoun County with continued expansion
Meta — significant campus in the region supporting the company's social media and AI infrastructure
Equinix — the largest colocation provider in the market, with its Ashburn campus serving as a critical internet exchange point
Digital Realty — major colocation presence across multiple Northern Virginia locations
QTS Realty — massive campus developments in Prince William County
CyrusOne / KKR — significant and growing presence in the market

This concentration of operators means that Northern Virginia's data center ecosystem is self-reinforcing. The density of interconnection options, the depth of the contractor base, the availability of specialized workers, and the proximity of equipment suppliers all make it easier and more cost-effective to build in the region than almost anywhere else. This network effect has sustained Virginia's dominance even as other markets have grown.

Loudoun County — Data Center Alley

Loudoun County, Virginia has been the epicenter of U.S. data center construction for two decades, and it continues to attract the largest projects. The county hosts the MAE-East internet exchange point (now operated by Equinix), which serves as a critical interconnection hub for internet traffic, and the fiber-optic infrastructure radiating from this hub gives Loudoun County a latency advantage that is difficult to replicate elsewhere.

Current Construction Activity

As of early 2026, Loudoun County has approximately 8 to 10 million square feet of data center space in various stages of active construction. Major projects include:

Amazon's continued expansion of its Ashburn-area campuses, with multiple buildings in construction simultaneously. The company has received permits for at least three new facilities totaling approximately 1.2 million square feet, with combined IT capacity of roughly 180 megawatts.

Microsoft's eastern Loudoun campus, a 900,000-square-foot development that represents part of the company's $14 billion domestic data center investment program. The project involves extensive site preparation, utility infrastructure, and multiple phases of vertical construction.

Google's two-building expansion adding roughly 600,000 square feet and 90 megawatts of IT capacity to its existing Loudoun presence.

Equinix's DC-17 and DC-18 facilities, adding approximately 400,000 square feet of colocation space to the company's already massive Ashburn campus.

Zoning and Community Relations

Loudoun County's relationship with data centers has evolved from enthusiastic welcome to wary coexistence. Data centers generate enormous tax revenue — they account for approximately 30 percent of the county's commercial property tax base — but they also consume large amounts of land, generate noise from cooling equipment and generators, and create relatively few permanent jobs compared to office or retail developments.

The county's Board of Supervisors has responded by imposing increasingly strict land use regulations on data center development. A 2025 ordinance established enhanced noise standards, increased building setback requirements, and mandated visual screening (berms, landscaping, and architectural treatments) for data center facilities in proximity to residential areas.

These regulations have added cost and time to data center projects in Loudoun County. Noise mitigation for cooling towers and generators can add $2 million to $5 million per project. Enhanced landscaping and screening can add another $1 million to $3 million. Permitting timelines have lengthened by 3 to 6 months as projects navigate the new requirements.

Despite these challenges, Loudoun County remains the premier data center location in the United States. The economics still work — land and construction costs are higher than emerging markets, but the connectivity advantages, existing infrastructure, and established contractor ecosystem offset these premiums for most operators.

Prince William County — The Overflow Market

As Loudoun County has become more constrained by zoning, land availability, and community opposition, Prince William County has emerged as the primary expansion market for Northern Virginia data center construction.

QTS Mega Campus

The most significant project in Prince William County is the QTS Realty campus at the former Innovation Technology Park, which at full buildout will be one of the largest data center campuses in the world. The development is designed to deliver over 500 megawatts of IT capacity across more than 4 million square feet of data center space in multiple phases.

Phase one of the QTS campus is already operational, with phases two through five in various stages of construction. The project has employed up to 2,500 construction workers at peak and has created significant demand for electrical and mechanical trades in the region.

Amazon's Prince William Expansion

Amazon's data center development near its HQ2 corporate campus in Prince William County represents another massive construction program. Three buildings are either completed or under construction, with four additional facilities in permitting. The campus will ultimately deliver hundreds of megawatts of IT capacity and represents a multi-billion-dollar construction investment.

Workforce Pipeline

Prince William County has partnered with Northern Virginia Community College and local trade unions to develop workforce training programs specifically targeting data center construction skills. These programs aim to create a local pipeline of electricians, HVAC technicians, and controls specialists who can support the county's growing data center industry.

The Dominion Energy Power Crisis

The single biggest challenge facing Virginia's data center construction market is power — specifically, the inability of Dominion Energy to deliver the electricity that data center operators need at the pace they need it.

The Scale of the Problem

Dominion Energy's interconnection queue — the list of customers requesting new electrical service connections — includes over 40 gigawatts of requests as of early 2026. To put this in perspective, Dominion's total current generating capacity is approximately 30 gigawatts. Even accounting for the fact that many queue entries will never materialize, the backlog is staggering.

The utility has publicly stated that major transmission upgrades required to serve the Northern Virginia data center load have lead times of 3 to 7 years. These upgrades include new 500-kV transmission lines, expanded substations, and additional generating capacity — all of which require extensive permitting, environmental review, and construction.

Impact on Construction

The power constraint is affecting data center construction in Virginia in several ways.

First, it is slowing new project starts. Operators who cannot secure firm utility interconnection commitments are delaying or canceling projects, choosing instead to build in markets where power is more readily available. This dynamic is directly benefiting emerging markets like Indiana, Georgia, and Ohio.

Second, it is driving investment in on-site power generation. Several Virginia data center projects now include on-site natural gas turbines or fuel cell installations that provide dedicated power independent of the Dominion grid. These installations add significant scope, cost, and complexity to construction projects.

Third, it is changing building design. Some operators are incorporating energy storage systems (battery banks) into their Virginia facilities to manage power quality and provide short-duration backup during grid fluctuations. Others are designing facilities for lower power density than their standard specifications, essentially underbuilding IT capacity relative to building size in order to stay within available power budgets.

Dominion's Response

Dominion Energy has proposed approximately $10 billion in transmission and distribution upgrades to serve the data center market, including:

New 500-kV transmission lines connecting the Piedmont region to the Northern Virginia load center
Expansion and reinforcement of multiple substations serving data center corridors
Accelerated deployment of advanced metering and grid management technology
Exploration of dedicated nuclear generation to serve data center loads

These investments, if approved by Virginia regulators, would address the power constraints over a 5 to 10 year horizon. But they do not solve the near-term problem, which means that power availability will continue to constrain Virginia data center construction for at least the next three to five years.

The Contractor Landscape

Virginia's data center construction market is served by a deep and experienced contractor base that has been built up over two decades. The major general contractors active in the market include DPR Construction, Holder Construction, Hensel Phelps, Turner Construction, Whiting-Turner, and Balfour Beatty, among others.

The MEP subcontractor landscape is similarly deep, with firms like Rosendin Electric, MYR Group, Power Solutions International, and Southland Industries maintaining large, dedicated data center divisions in the region.

Breaking In

For contractors from outside the region who want to enter the Virginia data center market, the barriers are significant. The established firms have deep relationships with the major operators, extensive local knowledge, and large local workforces. New entrants typically need to either acquire a firm with an existing data center presence in Virginia or start by taking subcontractor roles on larger projects and building relationships over time.

The emerging data center markets — Indiana, Ohio, Georgia — offer better entry points for contractors looking to establish data center capabilities without competing head-to-head against Virginia's entrenched firms.

Construction Costs in Virginia

Data center construction costs in Northern Virginia are among the highest in the country, driven by the combination of expensive land, high labor costs, and stringent local requirements. Representative cost ranges (in 2026 dollars) include:

Land: $500,000 to $2 million per acre in Loudoun County; $200,000 to $800,000 per acre in Prince William County
Site Development: $15 to $25 per square foot of building area
Shell Construction: $150 to $250 per square foot
MEP Systems: $300 to $600 per square foot (varies significantly based on power density and redundancy level)
Total All-In Cost: $8 to $12 million per megawatt of IT capacity

These costs represent a 15 to 25 percent premium over emerging markets like Indiana and Ohio, where land is cheaper, labor costs are lower, and local requirements are less stringent. However, the premium is offset for many operators by the connectivity, ecosystem, and operational advantages that Virginia provides.

For perspective on how these data center costs compare to broader commercial construction trends, see our 2026 construction spending forecast, which provides cost benchmarks across all nonresidential building types.

What Comes Next

Virginia's data center corridor is at an inflection point. The market is still growing — current construction activity exceeds $10 billion in estimated contract value — but the rate of growth is being constrained by power availability, land costs, and community resistance.

The most likely scenario is that Virginia remains the largest single data center market in the United States for at least the next decade, but that its share of total national data center construction spending declines as emerging markets capture a growing portion of new investment. Virginia's 25 million-plus square feet of existing space creates enormous maintenance, upgrade, and expansion demand that will sustain the construction market even if new greenfield development slows.

For construction firms, the strategic question is whether to double down on Virginia — where the market is large but highly competitive — or to diversify into emerging markets where competition is less intense and growth rates are higher. The answer will depend on each firm's existing relationships, capabilities, and risk tolerance, but the data suggests that a blended approach — maintaining Virginia presence while establishing footholds in one or two emerging markets — offers the best risk-adjusted opportunity.

The construction workforce challenges are also particularly acute in Virginia, where the concentration of data center construction has strained the local skilled trades supply beyond its limits. For more on this dynamic, see our workforce gap analysis, which details how data center construction is affecting labor availability across the broader construction market.