The church comprises a nave with a W bell-turret, a S porch, a N aisle, and a chancel with a modern flat-roofed vestry on its N side. The three-bay N arcade, which has moulded capitals and chamfered, pointed arches, is Early English in style.

In 1086 Heyshott was held by Odo of Winchester. It had a church.

This font dates from the early 13thc. It seems contemporary with the capitals of the S arcade (three bays). Fonts with moulded capitals which form part of a square bowl are found at Cuckfield, Iford, Ripe, Slindon, West Hoathly and Woodmancote. The font at Selmeston and the disused font at Maresfield, although both circular, also have this feature.