A long thaw, finally. AIA’s March 2026 Architecture Billings Index landed at 49.8, the closest the index has been to neutral since the first quarter of 2023. All three building sectors crossed above 50 for the first time in roughly two years. Backlogs at responding firms climbed to 6.6 months, the highest since December 2023.
The ABI tracks billings at U.S. architecture firms as a leading indicator for nonresidential construction, typically running 9 to 12 months ahead of building starts. A reading of 50 separates growth from contraction. The index has been below 50 almost every month since mid-2023.
The signal under the headline
Institutional firms reported the strongest billings, at 52.6. Commercial and industrial firms came in at 52.5. Multifamily residential design, which has been ugly for the better part of two years, came in at 50.9.
Regionally, the West posted 50.6, its first positive print since December 2024. The South stayed above 50. The Midwest and Northeast remained slightly under but improved.
The unresolved tell
New design contracts declined for the 25th consecutive month, and the rate of decline accelerated from February. That’s the metric architects use to forecast their pipeline 12+ months out. Backlog growth from existing committed work can mask this for a while, but the contract pipeline is still thin.
The implication for the construction side: starts will probably trail the Dodge Momentum Index recovery rather than running with it. Owners are exploring projects, but the contract-to-start handoff isn’t moving yet.
The texture of the data
A few details from the survey worth noting:
- Inquiries into new projects continued to rise — the third straight month of acceleration
- Backlogs of 6.6 months suggest firms are getting busier on the work they already have, not the work they’re winning
- Multifamily’s flip above 50 lines up with rent growth recovering in Sun Belt metros and the supply pipeline burning off through 2025
What to watch in April and May
If the May reading clears 50 and new contract values stop declining, the story becomes: the architecture market is finally back. If contracts continue to slip and the headline drifts down, the institutional and data-center-driven pieces of the index are masking weakness in the rest of the nonresidential market.
The next data release lands in late May.