The church, consisting of W tower, nave with clerestory, N & S aisles, S aisle transept, and the chancel, is mostly of the 13^th and 14^th centuries. Anglo-Saxon W tower arch and two reused Anglo-Saxon cross shafts on the lower exterior of the W tower. In 1857 the chancel was renovated and in 1861the vestry and organ chamber added; another restoration in 1889. The font is from the Romanesque period.

Market Overton is mentioned in DB as part of the land of Countess Judith, the niece of William the Conqueror, but there is no mention of a church here in 1086. However, several Anglo-Saxon remnants, namely the W tower arch, the two reused cross shafts on the W tower exterior and the two baluster shafts now in the churchyard stile, clearly demonstrate the existence of a church here in the 10^th/early 11^th century. The earliest mention of the advowson is in 1238 when the patron was Gilbert de Umfraville.

The square upper and round lower form of the bowl, the undulating, organic, curvilinear designs on the N, S and W faces of the bowl, as well as the different treatment of the upper corners of the bowl here are similar to that of the font at Lyndon, St. Martin, just some eleven miles south of Market Overton. Like this font, the Lyndon font was also broken in two fragments between the lower round and upper square portions. The higher relief of the curvilinear motifs at Lyndon, compared to that on the font here suggest that the Market Overton font may not have been finished. Pevsner suggests that the bowl is actually a reused, square Norman capital, possibly based on the treatment of the upper corners being like volutes on a capital. However, the large dimensions of the bowl and the similarity with the Lyndon font argue against this interpretation. Could this font and the Lyndon font be from the same workshop?