Architecture firms can’t catch a break. The Architecture Billings Index fell to 48.3 in April from 49.8 in March, and that small slide carries weight. The AIA/Deltek measure reads the front of the construction pipeline. A score under 50 means more firms reported billings shrinking than growing, and April marked the 28th month in a row below that line.
Here’s why a design metric should matter to anyone pouring concrete: billings at architecture firms tend to lead construction spending by nine to twelve months. What architects bill today, contractors build next year. The index hasn’t cleared 50 since January 2023. That’s not a blip. It’s a pattern.
What the April billings numbers say
The month wasn’t all bad news. Inquiries into new projects rose for the third straight month, and the value of newly signed design contracts came close to breaking even. Put those together and you get a picture of demand that keeps circling without landing. Owners are asking questions and running numbers. They’re slow to sign.
Geography didn’t help. No region reported billings growth in April. Firms in the West held up best for the third month straight, while the South gave back the tentative gains it posted earlier in the year. When every region sits below 50 at once, the weakness isn’t local.
Institutional and housing do the heavy lifting
The sector split is where the story gets interesting. Firms that specialize in institutional and multifamily residential work logged modest growth, the first real sign in months that new projects are taking shape. Schools, hospitals, labs, and apartments are moving. Commercial and industrial practices kept sliding and have been the weakest group for half a year, even with data centers and warehouses still booking work. Offices remain the drag they’ve been since 2023.
That divergence tracks with what the wider data already shows. Construction input prices keep climbing, and hiring barely moved in April as residential trades shed jobs. Firms aren’t betting big when financing costs and material prices both point the wrong way.
If the institutional and housing upticks hold through summer, starts could firm up in those categories by late 2027. That’s the bet worth tracking. For now the index keeps saying what it’s said for more than two years: design demand is treading water, and the firms that ride it out are the ones watching their contract pipeline, not the headlines.