The church has a 19thc. chancel; a 12thc. nave with aisles, extensively restored in 19thc., and a W tower. The N nave aisle has a two-storey porch with a timber-framed gable at the W end, protecting a 12thc doorway, and at the E end of the N nave aisle is a 13thc doorway with a pointed arch and dogtooth ornament, and a 12thc head corbel reset above it. The nave arcades are of four bays with single-stepped arches. The westernmost arch in the S arcade is round and plain. Other arches are pointed, with some sculptural decoration. There is a clerestory with round-headed windows in S wall of nave, but no N clerestory. Round-headed window in W wall of nave. Fortified W tower c.1200 with a W doorway of the same date. The building was restored in 1877 by G. E. Street.

Clun was held by Picot from Earl Roger in 1086, and by Eadric before the Conquest. It was assessed at 15 hides, 2 of which were held from Picot by Walter. The manor also had a mill. c.1190 Isabella of Say, baroness of Clun Castle, gave St George's, together with St Swithun's, Clunbury, to Much Wenlock Priory (see Clunbury).

Label stops on N doorway are probably 13thc. The N aisle doorway and its relationship to the N aisle are difficult to date. The animal head above the N aisle doorway recalls the head of a bear on the W corbel table at Diddlebury. The weathered human head above the W doorway resembles that above the W doorway at Diddlebury.