St Barnabas' Church, Mossley Hill

The church is built in specially moulded bricks of various sizes, with red sandstone dressings,[5] and the roof is of slate.[2] The architectural style is Perpendicular.[3][5] Inside, the columns are in Storeton stone.[5] The plan of the church consists of a four-bay nave with a clerestory, north and south aisles under lean-to roofs, two south porches, north and south transepts, a chancel with a south chapel and a northeast vestry, and a west tower. The tower has a west entrance, above which is a three-light window. The bell openings are paired with louvres, and above them is a cornice and an arcaded embattled parapet. The porches also have embattled parapets. The windows along the sides of the aisles and the clerestory have three lights, and those in the transepts and the chancel have five lights. The chapel windows have three lights, and those in the vestry have two and three lights.[2]

Inside the church are five-bay arcades between the nave and aisles, and a three-bay arcade between the chancel and the chapel,[2] the latter being more ornate than the former.[3] In the east window is a war memorial in stained glass by H. G. Hiller.[3] The two-manual pipe organ was built by Henry Willis & Sons, and there have been alterations and repairs since. The organ case was designed by Sydney W. Doyle.[7] There is a ring of eight bells[8] installed in 2010: the six largest bells were transferred from St James, Waterfoot, Lancashire,[9] and the two smallest bells from elsewhere.[6]