AIA Architecture Billings Index – October 2013


AIA Architecture Billings Index – October 2013

Washington, D.C. – November 20, 2013 – Following three months of accelerating demand for design services, the Architecture Billings Index (ABI) reflected a somewhat slower pace of growth in October. As a leading economic indicator of construction activity, the ABI reflects the approximate nine to twelve month lead time between architecture billings and construction spending. The American Institute of Architects (AIA) reported the October ABI score was 51.6, down from a mark of 54.3 in September. This score reflects an increase in design services (any score above 50 indicates an increase in billings). The new projects inquiry index was 61.5, up from the reading of 58.6 the previous month.

“There continues to be a lot of uncertainty surrounding the overall U.S. economic outlook and therefore in the demand for nonresidential facilities, which often translates into slower progress on new building projects,” said AIA Chief Economist Kermit Baker, Hon. AIA, PhD. “That is particularly true when you factor in the federal government shutdown that delayed many projects that were in the planning or design phases.”

Key October ABI highlights:

  • Regional averages: West (55.9), South (54.4), Midwest (51.6), Northeast (49.7)
  • Sector index breakdown: multi-family residential (57.0, commercial / industrial (53.7), mixed practice (53.2), institutional (50.2)
  • Project inquiries index: 61.5

The regional and sector categories are calculated as a 3-month moving average, whereas the index and inquiries are monthly numbers.

                     Oct.  Sept.   Aug.   July   June    May  April  March
                     2013   2013   2013   2013   2013   2013   2013   2013
Billings Index       51.6   54.3   53.8   52.7   51.6   52.9   48.6   51.9
  Monthly change     -2.7    0.5    1.1    1.1   -1.3    4.3   -3.3   -3.0
Inquiry Index        61.5   58.6   63.0   66.4   62.6   59.1   58.5   60.1
  Monthly change      2.8   -4.4   -3.4    3.9    3.5    0.6   -1.6   -4.7
                     Oct.  Sept.   Aug.   July   June    May  April  March
                     2013   2013   2013   2013   2013   2013   2013   2013
Northeast            49.7   50.1   53.0   53.2   56.3   52.7   52.3   52.0
Midwest              51.6   51.9   51.7   51.3   49.9   47.8   49.0   51.5
South                54.4   54.1   52.8   54.0   53.2   53.3   52.2   52.6
West                 55.9   55.9   58.2   52.8   52.0   51.0   51.7   51.5
Residential          57.0   55.2   54.6   52.7   53.5   53.2   52.6   55.2
Industrial           53.7   55.4   55.5   55.8   53.4   51.0   50.0   50.2
Institutional        50.2   50.2   50.7   50.5   51.6   51.4   51.3   50.7
Mixed                53.2   54.6   57.9   57.1   55.9   51.0   50.4   51.6
NOTE: Regional and sector data is a 3-month rolling average; data is 
seasonally adjusted.

About the AIA Architecture Billings Index

The Architecture Billings Index (ABI), produced by the AIA Economics & Market Research Group, is a leading economic indicator that provides an approximately nine to twelve month glimpse into the future of nonresidential construction spending activity. The diffusion indexes contained in the full report are derived from a monthly “Work-on-the-Boards” survey that is sent to a panel of AIA member-owned firms. Participants are asked whether their billings increased, decreased, or stayed the same in the month that just ended as compared to the prior month, and the results are then compiled into the ABI. These monthly results are also seasonally adjusted to allow for comparison to prior months. The monthly ABI index scores are centered around 50, with scores above 50 indicating an aggregate increase in billings, and scores below 50 indicating a decline. The regional and sector data are formulated using a three-month moving average. More information on the ABI and the analysis of its relationship to construction activity can be found in the White Paper Architecture Billings as a Leading Indicator of Construction: Analysis of the Relationship Between a Billings Index and Construction Spending on the AIA web site.

About The American Institute of Architects

Founded in 1857, members of the American Institute of Architects consistently work to create more valuable, healthy, secure, and sustainable buildings, neighborhoods, and communities. Through nearly 300 state and local chapters, the AIA advocates for public policies that promote economic vitality and public well being. Members adhere to a code of ethics and conduct to ensure the highest professional standards. The AIA provides members with tools and resources to assist them in their careers and business as well as engaging civic and government leaders, and the public to find solutions to pressing issues facing our communities, institutions, nation and world. Visit

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