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International Interior Design Association

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IIDA Index


IIDA Index

The IIDA Index, developed with Designer Pages, is a one-of-a kind indicator of economic health for the commercial design industry. Using project data from diverse design firms across the U.S., and focused on commercial interior projects, the Index is designed to enable firms to assess their position compared to the overall industry, recognize new business strategies, and identify market opportunities.

The Index features the IIDA Index Report, available for purchase, and a user-friendly online interface exclusive to participating firms.

Read the Introduction to the IIDA Index to find out more. 

“Until now, we have only had access to generalized reporting for the construction industry at large, but not specific to our core sector of commercial interior design. The availability of empirical data that’s directly representative of our marketplace will help inform future business decisions.” - Sascha Wagner, FIIDA, AIA, President and CEO, Huntsman Architectural Group

Project data is represented by a diffusion index that assesses growth using a neutral indicator of 50. A value above 50 indicates expansion; a value below 50 indicates contraction. The Index categorizes projects by region, project size, and market sector.

With an accelerated trend of growth and solidity in the profession and industry as a whole, the 2019 IIDA Index Report indicates robust industry expansion in 2018 compared to 2017. The 2018 index value of 70 is considerably higher than the 2017 index value of 59.

Additional key Index results include:

  • Healthy growth in all U.S. geographic regions, specifically in the East (88) and the Midwest (65)
  • Indications of expansion in Hospitality (62) and Workplace (58) projects across the country
  • Strong positive momentum in Education projects in the East (88)
  • Vigorous growth in Large projects in all regions (84) with particularly significant growth in the South (92)


Participate in the IIDA Index

Download and review the Introduction to the IIDA Index and share it with your firm leadership.

The submission period for the 2020 Index is currently open. Firms interested in maintaining their subscription or becoming a participant can learn more at

For more information, contact