The church consists of a west tower, a north transept, a south aisle and a south porch. The nave and chancel form one unit. The N wall of the nave and the walls of the transepts are probably Norman. However, the present appearance is almost entirely Perpendicular. There is a 12thc font.
The Domesday Survey mentiones no church in Lanreath. The lord of Lanreath was Aelfric in 1066 and Richard (son of Turolf) in 1086.
F. Arnold-Forster. Studies in Church Dedications, London (1899), 226.
N.Pevsner, Cornwall: The Buildings of England, London: Penguin Books (1974), 279- 280.