Llaethdy Sunday school was first built in 1860 as a branch of Capel Mawr, Amlwch. It was rebuilt in 1905 in the later Vernacular style of the gable-entry type, at a cost of £564, by architect Richard Davies of Bangor. The chapel is a very plain rendered example of an early twentieth-century rural Sunday School of some interest as the work of a named local chapel architect. In 2007 the school was in use as a chapel for worship.

RCAHMW, February 2010