Outside you can see the huge quoin stones on the south west corner, which may have come from the ruins of Roman Canterbury.
The South and West walls are possibly original, but the windows were added in the 1300s along with the tower on the North side of the church. (The tower was demolished in 1836.) The North aisle was built in 1486.

The roof with huge beams and king posts dates from the 1300s. Note the medieval woodwork in the sanctuary.

The East window of the Ascension is a fine piece of work by Ward and Hughes of London, 1897.
The font dates from 1420 and is one of the few surviving complete with the original cover and counter balance lifting system.
The bench ends on the Clergy pews, depicting an eagle, are thought to have come from St John's church, which was demolished in 1520.