 The rectangular structure with an internal width of 3 metres (10 ft) has an entrance door at one side near the back of the nave which is 4.87 m (16 ft) long, then a typically Romanesque round chancel arch 1.52 m (5 feet) wide with chevron mouldings decorating the arch above columns on each side leads into an apsed sanctuary 3 m long, with the apse having a radius of 1.52 m. The north wall has been renewed, and the three surviving outer walls are 61 cm (2 ft) thick, as is the chancel wall.Five small round-headed windows and the round arch above the entrance door confirm the Romanesque style.The five stained-glass windows were made by Douglas Strachan in 1922, and illustrate St Margaret, St Andrew, St Columba, St Ninian and William Wallace.