National Design Billings Slip as Midwest Firms Gain
Architecture firms nationwide face slower new contract signings, while commercial and industrial clients in the Midwest show modest billings growth.
Updated on Nov. 4, 2026 in Construction
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Midwest architectural billings strengthened in September while the national index weakened, falling to 44.7 from 47.2 in August. Firms serving construction clients across the country are seeing slower billings and longer project pipelines.
Why it matters
A reading below 50 on the AIA/Deltek Architectural Billings Index means more firms are seeing billings shrink than grow, which tends to precede slower construction starts. Tight project financing and cautious clients are slowing decisions across the country, pushing out timelines for design work.
The national billings index fell to 44.7 in September from 47.2 in August, while the Midwest index rose to 50.6, its strongest reading since November 2025. Average project backlogs shrank to 6.2 months at the end of the third quarter from 6.6 months at the end of the first quarter.
The players
AIA/Deltek Architectural Billings Index
A survey-based index that tracks billings at architecture firms and serves as a leading indicator for nonresidential construction activity.
AIA Iowa
The Iowa chapter of the American Institute of Architects, whose member firms contributed commentary on regional conditions.
The details
The billings index is built from a survey of architecture firms, and a score above 50 indicates that more firms are seeing billings grow than shrink. Commercial and industrial firms posted modest billings growth for a second consecutive month, while institutional and multifamily residential firms saw billings decline again. New project inquiries nationally edged up to 53.2, but the value of newly signed design contracts dropped to 43.7, showing that interest is not yet converting into committed work.
Timeline
Average project backlog stood at 6.6 months at the end of the first quarter of 2026.
The national billings index was 47.2 in August 2026.
The Midwest index last reached this strength in November 2025.
Average project backlog fell to 6.2 months at the end of the third quarter of 2026.
The September 2026 readings showed the Midwest at 50.6 and the national index at 44.7.
Market Landscape
The 50-point threshold of the AIA/Deltek Architectural Billings Index is the standard dividing line between expanding and contracting firm billings, and the national reading of 44.7 falls clearly beneath it. The Midwest's move above that line sets it apart from the national pattern and marks the region's strongest showing since November 2025.
Firms with heavy exposure to institutional or multifamily residential work should plan for slower billings and watch backlog levels closely. Operators in the Midwest may find near-term opportunity in commercial and industrial pipelines, which posted modest growth for a second consecutive month.
The takeaway
Operators should track the national billings index and backlog length each month, since a sustained drop in design contracts often shows up later as thinner construction starts. Business owners in construction-adjacent trades should compare their own pipeline length against the 6.2-month national average to gauge how much runway they have.
Further reading
For broader context on how design-stage slowdowns feed into construction activity, explore the Construction section.
Source note: This article includes information reported by Business Record.
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