[1] The church was built late in the 12th century as part of Ramsey Abbey, possibly the hospitium.

[2] The oldest part of the building dates from around AD 1180–90, when it was built as a hospital, infirmary or guesthouse of the abbey.

It was originally an aisled hall with a chapel at the east end with a vestry on the north side and the warden's lodgings on the south, but both these have been demolished.

The very small chancel, the long nave and the absence of a tower from the original church imply, as the investigators of the Royal Commission on Historical Monuments suggest, that the building may have been designed for a hospital, infirmary or guest house.

As in the case of all monasteries whose foundation predates the Norman conquest of England, the parishioners of Ramsey would have had rights in the monastic church.

The late 12th-century building consisted of a chancel, with north and south chapels, nave and aisles.

In the south wall is an early 14th-century window of two pointed lights with a trefoil above in a roundhead, and farther west is a doorway of about 1600, with a four-centred arch in a square head.

The 12th-century chancel arch has a two-centred head, and the responds have scalloped capitals and moulded bases.

The clerestory, consisting of seven windows of two cinquefoiled lights in four-centred heads on each side, is of 15th-century date.

The 15th-century oak lectern has a steep double rotating desk, supported on a square stem with four traceried buttresses surmounted by figures of the evangelists.

In 1672 the wooden steeple collapsed and was replaced by the present west tower, built with material taken from the monastic buildings.

The tower arch is two-centred, with semi-cylindrical responds, having two attached shafts, scalloped capitals and moulded bases.

A beam of the bell frame bears the inscription, "1672 Nevill Jones et Thomas Wallis, churchwardens".

In 1810 Robert Taylor recast these bells at his St Neots bell-foundry to form the present ring of six.