This large church, set in the village of Irnham, originally possessed a S aisle, of which arcade remnants can be seen in the S wall of nave. The lowest stage of the W tower is the oldest part of the church; the W doorway and W tower arch into the nave are Romanesque.

Domesday Book records a church and a priest at Irnham in 1086 on land held by Ralph Pagnell. Ralph owned a house in Lincoln as well as eight manors in Lincolnshire, including Irnham. Ralph is listed as the sheriff of Yorkshire in 1088 (Morgan and Thorn 1986, 14, 35). St Andrew’s is linked with the Luttrell family that resided in Irnham Hall, adjacent to the church. Robert Luttrell was rector here from 1262 to 1315. Around 1325 Sir Geoffrey Luttrell commissioned the renowned Luttrell Psalter (British Library Add. MS. 42130).

On the W doorway, the N jamb and the N impost are renewed as is the sill. The abacus and impost on the crocket capital of the W tower arch have very clean, sharp edges which suggest that the capital has perhaps been scraped or re-cut. The result is rather clumsy looking and somewhat reminiscent of Pearson’s work just up the road at Boothby Pagnell, St Andrew. (fieldworker)

The three-bay nave, N aisle, and chancel date from the late 13thc, and the N chancel chapel, with its own three-bay arcade, from the early 14thc. The clerestory and crenellation are late medieval, probably 15thc or 16thc. The upper stage of the W tower with the bell-openings is 14thc, while the lancets below - blocked in on two sides - are 13thc.