The church has an aisleless nave with early 14thc wallpaintings considered by Pevsner to be among the finest in the county. The chancel is originally 13thc, from the evidence of a low side lancet in the N wall, but for the rest, both nave and chancel have no features earlier than the 14thc. There is no tower but a double bellcote over the W gable, brought here from Eythrope Park after 1811. Construction is of flint and rubble with stone dressings. The only Romanesque feature is a plain font.

Little Kimble was held by Albert from Turstin fitzRolf in 1086, when it was assessed at 10 hides. Before the Conquest it was held by Beorhtric, a thegn of King Edward. The name of the overlord who succeeded Turstin is not known, but in the later 12thc it was in the hands of James de Newmarket, who died before 1215 leaving it to his daughters Isabel and Hawisia. The story of the dispute between the husbands of the two heiresses, Ralph Russel and Nicholas de Moels, is told in the VCH account. The tenancy is known to have been held by one Humphrey le Dun around 1215, and he was presumably the Humphrey de Kimblewho gave the church to St Albans Abbey in the early 13thc.

Pevsner and Williamson are uncertain about the date of the font, giving 12thc with a query. The list description calls it "an early tub font", and the RCHME inventory calls it a font "of crude workmanship, late 12th or early 13th-century." It is interesting that it still has its original base, and that this contains more carving than the bowl.