• Construction Cost Index History
  200 hours of common labor at the 20-city average of common labor rates, plus 25 cwt of standard structural steel shapes at the mill price prior to 1996 and the fabricated 20-city price from 1996, plus 1.128 tons of portland cement at the 20-city price, plus 1,088 board-ft of 2 x 4 lumber at the 20-city price.
• Building Cost Index History
  68.38 hours of skilled labor at the 20-city average of bricklayers, carpenters and structural ironworkers rates, plus 25 cwt of standard structural steel shapes at the mill price prior to 1996 and the fabricated 20-city price from 1996, plus 1.128 tons of portland cement at the 20-city price, plus 1,088 board-ft of 2 x 4 lumber at the 20-city price.
• Materials Price Index
  The Materials Cost Index is the materials component of ENR’s building and construction cost indexes. It tracks the weighted price movement of structural steel, portland cement and 2 X 4 lumber.
• Skilled Labor Index
  The Skilled Labor Index is the labor component of ENR’s Building Cost Index and tracks union wages, plus fringe benefits, for carpenters, bricklayers and iron workers.
• Common Labor Index
  The Common Labor Index is the labor component of ENR’s Construction Cost Index and tracks the union wage, plus fringe benefits, for laborers.

The building and construction cost indexes for ENR’s individual cities use the same components and weighting as those for the 20-city national indexes. The city indexes use local prices for portland cement and 2 X 4 lumber and the national average price for structural steel. The city’s BCI uses local union wages, plus fringes, for carpenters, bricklayers and iron workers. The city’s CCI uses the same union wages for laborers.