St Andrew's has a nave with a S aisle but curiously a clerestorey on the N side only. The S arcade is of three bays and partly 12thc., but with one 19thc. pier. The nave has a 19thc. S doorway under a 19thc. porch. The chancel and its arch date from 1872, but to the S is a large late-13thc. chapel with a two-bay arcade. It now houses the organ and vestry. The W tower is of four storeys, Perpendicular in style and in fact for its lower storeys, although the upper parts are 19thc. Construction is of rough stone blocks except for the ashlar tower. The only Romanesque feature is the S arcade.

The majority of Arthingworth, slightly more than two hides and a virgate, was held by Humphrey from the Count of Mortain in 1086. In addition to this, half a virgate belonged to the King's manor of Rothwell and Orton, and half a virgate to St Edmundsbury Abbey. No church is recorded.

Benefice of Arthingworth and Harrington with Oxendon and East Farndon.

Pevsner suggests that the form of the 19thc. pier 2 indicates that the 12thc. aisle ended at this point. If so, the W impost must be reused, which is probable as it is unlike the E respond. The form of arches and imposts suggests a date at the very end of the 12thc.