The composition of the church demonstrates Hawksmoor's characteristic abruptness: the very plain rectangular box of the nave is surmounted at its west end by a broad tower of three stages topped by a steeple more gothic than classical. The magnificent Tuscan porch with its semi circular pediment is bluntly attached to the west end: it was a late addition to the design intended to add further support to the tower.

Like those of Hawksmoor's other London churches and many of Wren's, the central space of the nave is organised around two axes, the shorter originally emphasised by two entrances of which only that to the south remains . It has a richly decorated flat ceiling and is lit by a clerestory. The aisles are roofed with elliptical barrel-vaults carried on a raised Composite order (cf. Wren's St. James, Piccadilly), and the same order is used for the screens across the east and west ends. The Venetian window at the east may show his ease with using Palladian motifs, or it may be a rhyme with the arched pediment of the entrance portico, repeated in the wide main stage of the tower.