Radnage is a dispersed village in the Chilterns, consisting of houses, and farm buildings scattered along a network of minor roads in the hilly, wooded landscape around Bledlow Ridge, 5 miles NW of High Wycombe. The church stands on its own at the N end of the village. It has a nave with a 15thc S porch and a 20thc vestry in the corresponding position on the N. There is a slender central tower (but no sign of transepts), and a two-bay chancel. The church is faced with flint, with ashlar dressings. The building is substantially of the years around 1200, and features that may be 13thc are thus included here; the crossing arches, plain font and S doorway. There is also a scallop capital converted for use as a piscina.

Radnage is not mentioned under that name in the Domesday Survey, but it seems, at that date, to have been a royal demesne attached to the manor of Brill. In the early 12thc Henry I divided the manor into two parts, reserving the larger, known as Radnage Manor, to the crown; and presenting the smaller to the nuns of Fontevrault. The church was attached to the first of the two, which is known to have been the subject of temporary grants under Henry II, and to have been given to the Knights Templar by King John in 1215. When that order was suppressed in the early 14thc, its property passed to the Knights Hospitaller, and the manor returned to the Crown at the Reformation.

The carving of the piscina on two faces rather than three or four rules out the possibility that it could have been a pillar piscina originally; Such a capital must be from a doorway or a window. This most probably predates the chancel arch and doorway, which belong to the years around 1200.