Tower has 2 diagonal, stepped buttresses, C14 west doorway with moulded pointed arch and panel window over the brick dressings to stonework.
Inside is a C13 font with square bowl on round shaft and 4 detached columns
The square font at Kirton is square and is thought to date from the 13th century, a survival from an earlier church on the site. Unusually it now stands not near the entrance but at the east end of the north aisle, a 19th-century addition to the present early Tudor building which itself is some three centuries younger than the ancient font. The timber cover, an octagonal pyramid, may well be a much newer addition. Suffolk Churches http://www.suffolkchurches.co.uk/kirton.htm
C15 piscina and south blocked doorway.