The interior of Convocation Hall is a mix of Romanesque and Gothic with an open, cathedral-like space featuring king-post hammer beam truss enlivened with embellished pendants and articulated bossed junctions, and a combination of red brick and buff brick incorporated into a decorative pattern. The side walls feature a series of round arched windows and the centre of the north wall features a rose window set in a Romanesque niche, which unfortunately was concealed from the interior by renovations carried out in the mid-1960s.