The earliest parts of the Church, nave, North aisle, tower and belfry date from the 12th century. The nave has sections of herringbone masonry that is typical in the area during the early Norman period. It is a feature of the use of building with the material from the thin upper beds of the local limestone.
The three Western bays of the North aisle are of the 13th Century, but the Eastern bay dates to the 15th Century, probably inserted when St. Mary's Chapel was built.
The South aisle, clerestory and chancel are of 14th Century date. There is an Easter sepulchre in the Chancel, also a stone bench for the priests, a double piscine and a mediaeval altar stone. The chancel was partially rebuilt in 1872-3 to the design of George Gilbert Scott and the floor is laid with beautiful Victorian tiles. The tower had to be partially reconstructed in 1898 and the nave was re-roofed in 1938.
The gates of the rood screen have the initials W A on them, those of William Adam, Lord of the Manor of Owston, although he is buried in Burghwallis Church.
Two beautiful marble monuments by Chantrey are in the chancel. Thee wall mounted one is to Bryan Cooke who died in 1821; he is depicted siting with his face resting on his hand. That to his wife depicts a lady kneeling, with head bowed and arms crossed; she is set on a pedestal.
A brass depicting Robert of Hatfield and his wife holding hands is under an archway of the nave close to the South aisle. He founded a Chantry in the church just prior to his death in 1417.
(See below)