The session house, which forms the south "transept", has a Baronial turret attached to it. Internally there is rich ornamentation with many stained glass windows and an apsidal baptistery with a mosaic floor and painted half domed ceiling entered under a chevroned arch. The plain massive columns of the six-bay nave with its half-rounded timber ceiling dominate. This famous pitch pine barrel-roof was the work of Turnbulls of Bonhard. The stone for the church was brought by horse from Deanfield Quarry and the whole operation cost £6,500.