This is a small church of cruciform plan. The nave, N aisle and probably chancel are of Transitional style, from c. 1190. The transepts were added c. 1260. Romanesque features are the late 12thc S doorway, an arch in the N wall of the chancel, the N arcade of four bays, the tube font, and the capital reused as a piscina.

Kelmscott belongs to the Shill Valley and Broadshire benefice. The settlement of Kelmscott belonged to the estate of Broadwell and is not mentioned in a separate entry in the Domesday Book. A chapel, dependent on Broadwell parish church, was established at Kelmscott sometime between the late 11thc and 1200 (VCH, 140). The chapel existed until 1430, by then dedicated to St George.

The decorated capitals of the N nave arcade can be compared with similar arcades at Langford and Little Faringdon, Oxfordshire, both nearby, and all were probably executed by the same masons.

The capital reused for the piscina is of similar octagonal type to those in the N arcade.