How fast is the data-center buildout growing compared with past capex booms?
Core argument: Data-center capex is projected to rise from 1.4% of GDP in 2025 to 3.1% in 2027, adding 1.7 percentage points in two years, or roughly 0.85 percentage points a year.
In level, the ongoing data-center buildout sits between the fiber and housing cycles: more than twice the fiber peak, less than half the housing peak. In cumulative change, what matters is not the level of the share but how much it moves. On this measure, the data-center buildout is the bigger capex cycle. In speed, the contrast is sharper still, and it holds even when each cycle is measured over its own fastest stretch. Data-center capex adds 1.7 percentage points in just two years, from 1.4% of GDP in 2025 to 3.1% in 2027, or roughly 0.85 percentage points a year. Housing's quickest phase, from 5.1% in 2002 to 6.6% in 2005, ran at 0.5 percentage points a year, and telecom's at around 0.15. The AI cycle is building at close to twice the pace of the housing boom at its fastest.


