The church consists of nave, chancel, N aisle, W tower and vestry (the vestry abuts the N wall of the chancel). In the 12thc. it consisted of chancel, nave and W tower. The N aisle and three-bay N arcade are 13thc., the chancel was widened in the 14thc. and the tower was rebuilt in the 15thc. The S wall of the chancel and the S porch are of brick and are 17thc.-18thc. and the vestry is 20thc. The S wall of the nave is the only surviving 12thc. feature, and sculpture is found on a reused fragment and a reset tympanum.

There is no reference to Ravensden in the Domesday Survey, although it may be the manor referred to as Chainhalle (Channels End), which was held by Hugh de Beauchamp. This manor was given to Newnham Priory (Bedfordshire) by Simon de Beauchamp c.1166 and remained with the Priory until the Dissolution. (VCH, 214)

It seems likely that the reset fragments were from the original 12thc. church. Hall, Hutchings and Dring suggest a late 12thc. date for the fragments, based on the archaeological evidence.