The church consists of a nave, a chancel, N aisle and NW tower. The only Romanesque feature is a doorway, now blocked, re-set in the N wall of the N aisle.

Idbury is listed in the Domesday Survey as a settlement worth £12, and held of the king by Ralph de Mortimer and re-gifted to Oidelard. No church is mentioned in the Survey but a chapel must have existed by the 12thc. In the late 11thc Idbury was presumably dependent on the church at Swinbrook, perhaps functioning as a chapel of Shipton under Wychwood and Brixworth - all at the time attached to the Salisbury cathedral.

There seems to be no substance in Hoffmann's statement, repeated by Pevsner, that the 14thc chancel arch contains earlier remains.

The chevron in the arch of the 1st order may be compared with the re-used chevron voussoirs at Bampton.