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Any score below 50 indicates a billings decline, although this month’s score indicates that fewer firms reported a decline in billings in December than in November.

Architecture firm billings declined throughout 2025 and most months since October 2022, with only three exceptions. While fewer firms reported a decrease in December, declining design contract values suggest a near-term rebound is unlikely. However, firm backlogs remain strong, averaging 6.3 months. Large firms with annual billings of $5 million or more report backlogs of 8.6 months, while institutional specialists average 8.2 months. Despite a decline in project inquiries and the value of newly signed design contracts, work pipelines have remained stable in recent years.

“Despite the ongoing decline in billings at most architecture firms, there are a few signs of potential improvement on the horizon. The number of inquiries into future project work continues to grow, and Midwest firms saw billings increase for the fourth consecutive month in December,” said AIA Chief Economist, Kermit Baker, Hon. AIA, PhD. “In general, however, overall conditions remain weak across all specializations. Multifamily residential firms faced the steepest declines, while institutional firms experienced a slightly slower pace of decline compared to earlier in the year.”

Key ABI highlights for December include:
•    Regional averages: Midwest (51.7); South (47.7); West (45.3); Northeast (44.2)
•    Sector index breakdown: institutional (48.7); commercial/industrial (47.8); multifamily residential (45.5); mixed practice (firms that do not have at least half of their billings in any one other category) (44.0)
•    Project inquiries index: 52.9
•    Design contracts index: 47.5

The regional and sector categories are calculated as three-month moving averages and may not always average out to the national score.