Prices for inputs to construction materials expanded 0.8 percent in March and are 5.8 percent higher than at the same time one year ago, according to an ABC analysis of U.S. Bureau of Labor Statistics data. Prices for nonresidential construction inputs increased 0.9 percent on a monthly basis and are up 5.6 percent year over year.

The upward pressure on construction materials prices was masked to a certain extent by natural gas.  Natural gas prices fell 32.1 percent in March—after rising 23.5 percent in February—and are down nearly 13 percent on an annual basis. In stark contrast, crude petroleum prices expanded 5 percent in March and are up 34 percent year over year. Predictably, steel prices rose in March, but larger increases are forthcoming as the price of steel to be delivered is increasingly subject to the renegotiation of expiring contracts.

“Construction backlog and other data indicate that leaders at the typical nonresidential construction firm expect their company to be busy in 2018, but that meaningfully expanding profit margins may prove challenging,” said ABC Chief Economist Anirban Basu. “A combination of economic momentum and dueling tariffs has served to accelerate construction input price growth in categories that have been featured in recent trade disputes, such as steel/iron and softwood lumber.

“Ongoing increases in employee compensation strongly suggest that the cost of delivering construction services is set to rise substantially in 2018,” said Basu. “So far, there is little evidence to suggest that purchasers of construction services have been significantly discouraged by rising prices in the context of an improving economy. However, construction spending growth continues to be only moderate, and further cost increases may induce more developers and other purchasers to postpone projects. Growing uncertainty regarding the availability of domestic steel and other inputs during the latter stages of 2018 also may have a chilling effect on some project starts.