The AIA’s monthly Architecture Billings Index (ABI) increased to a score of 50.8 in October, up 2.4 points from September’s 48.4, the Institute announced today. More importantly, those 2.4 points moves the index and the design and construction market from contraction back to growth.

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The ABI is a leading economic indicator of construction activity in the U.S., and reflects a nine- to 12-month lead time between architecture billings and construction spending nationally and regionally as well as by project type. A score above 50, like this month, represents an increase in billings from the previous month, while a score under 50 represents a contraction.