Grade II*listed
The church dates from the twelfth century onwards and consists of a west tower with a pyramid roof, nave with north aisle, south porch, chancel, and vestry.
The tower dates from the early twelfth century at the lower stage where there is a small west doorway with a tympanum, which is most likely a copy. The bell chamber stage dates from 1868. The interior tower arch is twelfth century with a rounded head.
An existing south aisle was removed in the past, and the arcades can still be made out within the south wall of the church. They probably originally dated from the thirteenth century. The north aisle of two bays was rebuilt when the church was restored in 1883.
The chancel was rebuilt in 1868, although the chancel arch is thirteenth century. There is also a Norman pillar piscina.
There is a 19th-century pink marble and ashlar pulpit, and most of the other fittings are nineteenth century, including two stained-glass windows.
The font is Norman.
There is an old rhyme told about the church: "You must pity poor Swallow People, who sold the bells to mend the steeple". This refers to the collapse of the steeple some time before 1663. This is probably when the south aisle was destroyed.
The church was repaired in 1968 and again in 1976 when over £2000 was spent.
See other images of Holy Trinity church, Swallow