Thanks to a surge of apartment-building construction, billings at architecture firms in
The Architecture Billings Index increased to 51.6 from 50.2 in August. A score above 50 indicates an increase in billings, while scores below 50 means a decrease.
The strongest sector continued to be residential; the residential index increased to 57.3 from 55.4. Billings for commercial and industrial property rose to 48.4 from 48.