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AIA Billings Index Posts Fourth Consecutive Growth Month

AIA-logoWashington, D.C. – Design services at architecture firms continue to project a healthy disposition on the construction industry as the Architecture Billings Index (ABI) recorded the fourth consecutive month of growth. 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 May ABI score was 53.0, up from a score of 50.9 in the previous month. This score reflects an increase in design services (any score above 50 indicates an increase in billings). The new projects inquiry index was 62.4, up from a reading of 60.2 the previous month, while the new design contracts index increased from 53.2 to 54.8.

“The fact that the data surrounding both new project inquiries and design contracts have remained positive every month this year, while reaching their highest scores for the year, is a good indication that both the architecture and construction sectors will remain healthy for the foreseeable future,” AIA Chief Economist, Kermit Baker, Hon. AIA, PhD. “This growth hasn’t been an overnight escalation, but rather a steady, stable increase.”

Key May ABI highlights:

• Regional averages: South (56.1), West (52.3), Midwest (50.4), Northeast (46.5)

• Sector index breakdown: mixed practice (55.8), multi-family residential (51.3), commercial / industrial (51.2), institutional (51.2)

• Project inquiries index: 62.4

• Design contracts index: 54.8

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

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 recently released White Paper, Designing the Construction Future: Reviewing the Performance and Extending the Applications of the AIA’s Architecture Billings Index on the AIA web site.

About The American Institute Of Architects

For over 150 years, members of the American Institute of Architects have worked with each other and their communities to create more valuable, healthy, secure, and sustainable buildings and cityscapes. Members adhere to a code of ethics and professional conduct to ensure the highest standards in professional practice. Embracing their responsibility to serve society, AIA members engage civic and government leaders and the public in helping find needed solutions to pressing issues facing our communities, institutions, nation and world. For more information, visit

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