Construction input prices rebounded in December after a steep decline in November, according to analysis of U.S. Bureau of Labor Statistics data by Associated Builders and Contractors (ABC).

Input prices rose 0.4 percent for the month and are up 2.1 percent year-over-year, the largest 12-month increase in 30 months.

Nonresidential input prices collectively experienced a slightly larger increase, due in part to surging iron and steel prices, rising 0.6 percent for the month and 2.2 percent on the year.

“Though a number of input categories have experienced significant increases in prices in recent months, the overall price gains are largely attributable to energy prices,” according to ABC’s analysis.