The village of Kilmersdon lies at the head of a valley leading N through the Mendip Hills to Radstock. It straddles the secondary road between Norton St Philip and Chilcompton, which road climbs to the W of the village up to the ridge along which runs N-S the Fosse Way and, to the NE, around Ammerdown Park up to the ridge along which runs the Frome-Radstock main A362 road.
The church is of Norman origin, although much of the existing fabric dates between the 15th and the 16thc; the church was restored in the 19thc. It consists of a W tower, a nave, a chancel, a N aisle with a chapel, a S organ loft and a vestry. The Romanesque elements comprise the window in the nave S wall (reopened in 1898), the plain narrow S doorway (now into the vestry) visible from the nave, remains of a chancel N window (again visible only from inside), many stretches of a fish-scale frieze outside, part of a corbel table on the nave walls and built-in fragments of carving inside (chancel N wall) as well as outside.
