The Tariff Math Is Quietly Repricing Every Groundbreaking

The Signal:

• The cost side of feasibility just lost a temporary buffer and kept two permanent ones.
• Tariff pass-through and energy costs are moving at once and respond to different policy levers.
• Data-center construction is crowding contractor capacity everywhere else.

A tariff framework that had capped part of the materials hit expired on July 24, replaced by a patchier Section 301 regime and a country-by-country map. Underneath it, the Section 232 steel, aluminum and copper tariffs sit at a permanent 50%, with no ceiling or expiration. That is the difference between a cost spike and a cost floor.

The numbers are already in the indices. Final-cost measures including contractor margin are running above 5% year over year, and JLL puts a roughly 8% upper bound in play for full-year 2026. Aluminum is up about 40%, steel pipe and tube up 12.5%, cement up 7.7%.

Labor makes it worse in a way capital cannot fix quickly. About 61% of US metros are supply-constrained for construction labor today, rising to 72% by 2027. Where data-center work concentrates, contractor backlogs stretch to 12.2 months against 8.3 elsewhere, pulling capacity and pricing away from every other project.

Implications: For developers, pro formas underwritten in 2024 are stale on the cost line, and the gap is structural. Deals that only pencil at yesterday hard costs should be re-run before anything breaks ground. Contractors with locked material pricing and secured crews are now a competitive input, not a commodity.