The London-based practice won the task of renovating and extending the Blanden Art Museum in Fort Dodge in August.
According to McAslan, the revamp of the gallery will address its lack of display space and will release previous education facilities for use as offices. A new atrium will connect an original 1920s Beaux Arts museum to the new gallery space.
The development will create 50 per cent more space for the gallery - a total of 1,500m 2.
McAslan, who has got the go-ahead for the first stage of the project - principally a feasibility study, masterplan and outline designs - will present his proposals to the gallery trustees in November.