The National Association of Home Builders Eye on Housing was out Tuesday with a new survey of single-family builders that found the share of builders who report shortages of labor and subcontractors in 9 key trades has climbed steadily from a low of 21% in 2012, to 46% in 2014, to 52% in 2015, to 56% today.

Its "Eye on Housing" blog said shortages are particularly severe for basic skills like carpentry, with 72% of builders this year reporting either a serious or some shortage of workers willing and able to do rough carpentry. The association added:

... On the typical single-family home, three-quarters of the construction work is done by subcontractors. A shortage of subcontractors can therefore be very serious, and ignoring it gives an incomplete picture of the problem’s severity.

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