Plain tiled roof with crested ridge tiles and restored end parapets.
The bellcote is carried on three carved stone corbels.
The chancel has two C13 lancets in the south wall with modern labels.
North wall also has two C13 lancets.
Piscina, C13, of two bays each in two centred arch.
Font: C13, square bowl with chamfered courses on modern stem and base.
TL4481 : St Mary, Mepal - Font
Wall monument on west wall James Fortrey , son of Samuel Fortrey, of Fortreys Hall, Byal Fen, in Chatteris parish.