[6] During the 19th century, a significant amount of church rebuilding and restoration work took place throughout Anglesey, and St Peulan's was given a new roof and new internal fittings at this time.

At the west end, there is a gabled bellcote with one bell; crosses made of iron are fixed to the roofs of the chancel and south chapel.

The entrance door, from the 19th century, is positioned on the east side of the chapel and has a pointed archway.

[12] The east window of the chancel, from the 15th century, has two lights topped with trefoils and decorated with carved heads.

One of the shorter sides has a cross with four arms of equal length imposed on a ring; at the base are two small hemispheres, and the design is framed with bands (some plain, some decorated with chevrons or a twisted rope pattern).

Accepting the 11th-century dating, Lord stated that "as an altar of the pre-Norman period it is a unique survivor in Wales and, indeed, in Britain".

[13] The Friends of Friendless Churches describes the font as the building's "chief glory".

[2] It was given this status on 5 April 1971, and has been listed because it is "a rural Medieval church retaining its simple character.

"[3] It is described by Cadw (the Welsh Assembly Government body responsible for the built heritage of Wales) as a church "of typical Anglesey type", where the 19th-century restoration work has "retained the simplicity of design and construction", and also the church's medieval character.

[3] In the 19th century, the writer Samuel Lewis said that it was "small and of rude workmanship", but had "several curious features" such as the font that made it "valuable".

[4] The antiquarian Angharad Llwyd, writing in 1833, described it as "a small cruciform structure, situated in a little barren valley", with the south transept "bearing evidence of very great antiquity.