Wren's church retained the plan of its medieval predecessor, which was in the form of an irregular quadrilateral that tapered towards the east. The walls were made from brick and rubble covered with stucco, only the south and east fronts being exposed. The main façade, at the east end, towards Coleman Street, was faced with Portland stone with rusticated corners, and had a circular pediment between two pineapples. Between the pediment and the large round-headed window below was a carving of a cock between two swags. The south front had five large round-headed windows.