The architectural billing index (ABI) saw a drop of more than three points in November to 42.8 from 46.1 in October, attributed to continuing uncertainty in the construction industry.

The Colorado region in the US had the lowest regional rating at 41.1 while the south had the highest rating at 46.4, which is followed by the north-east 45 and the midwest 43.7.

The new projects enquiry score was zero for November when compared to October at 58.5.

Institutional projects had the highest rating at 47 which is followed by apartments 45.8, mixed-practice 42.8 and industrial 40.7, according to the data released in the November ABI.

The American Institute of Architects (AIA), a professional group for architects based in Washington, DC, produces the monthly index, which is a indicator of future commercial construction activity.