Early 12thc aisleless nave, W part of chancel, chancel arch, S doorway and blocked N doorway in situ, one small undecorated light in chancel (GL7/20), and font tub on a 19thc base. The chancel walls were raised and the E wall rebuilt as well as the S porch added (probably in the 19thc). In the 19thc the W wall of the nave was rebuilt, including the large window and the stone bell-cote. Between 1840 and 1880, the chancel floor level was raised by two steps to the sanctuary.

The Domesday Book records Winestune held by Ansfrid de Corneilles, who held one mill, Winson was in the liberty of Bibury, the mother parish. The Bishop of Worcester granted the church and chapels of Bibury, that is Winson ad Barnsley, to the Abbey of Oseney, near Oxford, the grant confirmed by Pope Alexander III in 1163. The church was dedicated to St. Michael by 1457. The earliest known documentary reference is of 1276.

The exterior sculpture is executed in pink stone while the chancel arch consists exclusively of grey stone.