Building construction cost data - located in the 2nd floor reference collection (TH 435.B9). Contains various construction related data, including construction and labor costs per hour for various cities.
Indexes for construction, building, and materials costs - Located in recent issues of ENR (Engineering News Record) - TA 1 .E611 in the "construction economics" section.
Marshall & Swift Equipment Cost Index - Located in recent issues of Chemical Engineering (TP1 .C5) in the section marked "Economic Indicators", it also includes Current Business Indicators. Available online in the ABI/Inform database.
Plant Cost Index - Located in recent issues of Chemical Engineering (TP1 .C5) in the section marked "Economic Indicators", it also includes Current Business Indicators. Available online in the ABI/Inform database.
Producer Price Index - from the Bureau of Labor Statistics. Includes PPI information for various commodities.