 The clock tower which rises to a height of , was built between 1660 and 1665 and remodelled in 1832–1833.The tower, which contains an original oak balustraded, cantilevered staircase, is the chief architectural feature of the building on the south side.The brick built tower has stone quoins at the corners and the staircase has eight original stone cross-windows with mullions, transoms and hoodmoulds irregularly spaced at different levels which contained leaded glass in an octagonal pattern.