 It is a Grade I listed building.The advowson or patronage of the church of St. Mary at Baldock originally belonged to the Knights Templar, who built the original church in about 1150 on land given to them by Gilbert de Clare, the Earl of Pembroke (parts of this early church are found at the east end of the chancel), and it continued in their possession until their suppression in 1308.It was then granted, together with the manor of Baldock, to the Knights Hospitaller, who expanded it in about 1330 and who in 1335 granted the advowson for ten years to John de Blomvill.