The Guildhall is built of Hamstone sourced from nearby Ham Hill, with slate roofs. The two-storey building has a T-shaped plan and is designed in the Classical style. The facade features a Doric portico with a double row of Tuscan columns at ground level and Doric columns on the second-storey. A domed cupola, featuring clock faces on three sides, sits on top of the facade's pediment. Both the council chamber and mayor's parlour survive unaltered.