The American Society of Interior Designers (ASID) has released its third quarter Interior Design Billings Index (IDBI).

Through September, the end of the third quarter, the IDBI was 59.0, up from the end-of-second-quarter June IDBI score of 57.1. However, the pace of billings at interior design firms saw a minor dip in October as the IDBI score was 54.8. Taken as a whole, though, the numbers are positive: any number above 50 represents expansion.

Based on the IDBI three-month moving average, billings have been in positive territory since the third quarter of 2011. Also, the September new product inquiry index score of 62.8 is up from the June score of 58.3 and has shown a series of steady positive scores since late 2011.

Total new construction spending is approximately 13.7 percent above its August 2014 level. During the fourth quarter of 2015, evidential improvement spending will increase an estimated $106.8 billion for the quarter, a year-over-year increase of 13.5 percent from the fourth quarter of 2014.

While the six-month business conditions index score of 66 for September is down from the June score of 74, the consistency of these scores in positive territory suggest ongoing continued expansion for the design industry.