St Peter's has an early 12thc. nave and chancel with scars of windows visible in the N wall of the nave inside, and plain round-headed windows in the chancel. A N aisle was added c.1160-70, and in the 13thc. a S aisle and W tower were built, and the W arch of the N arcade rebuilt. The clerestorey dates from the 15thc., and at this time too the S arcade was rebuilt. The N aisle was rebuilt in 1884-85, and the W tower in 1890. Construction is of stone and pebble rubble throughout, with ashlar buttresses except for those of the chancel, which are of brick. The tower has a short lead-covered spire. Romanesque features recorded here are the early 12thc. chancel arch, the mid-12thc. N arcade and the plain font, of indeterminate age.

In 1086 the manor was held by the Abbot of Ramsey. A priest and church were recorded at that time.

Benefice of Ramsey (St Thomas and St Mary) and the Upwoods.

The cusped scalloping of the W capital in the N arcade relates it to work at Fletton, and to the more complex capitals at Denny Abbey and Ely Infirmary.