Perpendicular nave with a S aisle of 1877 and N doorway under a porch, and a splendid 14thc. chancel with a N vestry. The W tower is dateable by the heraldry of its windows to the time of Bishop Fordham of Ely (1388–1426). The chancel is ashlar faced, the tower of pebble rendered with mortar and equipped with a stumpy lead spire, the nave of pebble with brick repairs, and limewashed except for the 19thc. S aisle. Into the W end of this, the Victorian builders incorporated a number of 12thc. carved stones, presumably from an earlier church on the site. These are described in Section III.3.d below. The report also describes the plain font.

In 1086 Grantchester included two main holdings, each of 2 hides and 3 virgates. One was held by Robert Fafiton, and the other by two knights from Count Eustace. A tenant named Robert also held 1 virgate from the Count of Mortain and half a virgate from Picot of Cambridge, but it is not clear whether this was also Robert Fafiton, or indeed whether one, two or three Roberts were involved. Finally, Gollan held 1½ virgates from Count Alan, and two knights held 3 virgates from Guy de Raimbeaucourt. No church is mentioned in connection with any of these holdings.