by Calculated Risk on 5/21/2008 01:08:00 PM

From the American Institute of Architects: Architecture Billings Index Remains Weak

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After sinking to its lowest level ever in March, indicating a rapid slowdown in billings at U.S. architecture firms, the Architecture Billings Index (ABI) rose slightly in April. As a leading economic indicator of construction activity, the ABI shows an approximate nine to twelve month lag time between architecture billings and construction spending. The American Institute of Architects (AIA) reported the April ABI rating was 45.5, up from the historic low mark of 39.7 in March (any score above 50 indicates an increase in billings). The inquiries for new projects score was 53.9.

The key here is that the index fell off a cliff in early 2008, and that there is "an approximate nine to twelve month lag time between architecture billings and construction spending". We should expect weaker non-residential structure investment throughout 2008.