St Oswalds chapel is the oldest part of the church. There is a carved statue of St Oswald in a niche on one of the pillars in the south aisle, which was placed there in the 19th century. The church was significantly restored in 1863 by notable Gothic Revival architect James Fowler (architect). The window above the altar depicts St Michael and was designed by the architect William Butterfield in memory of the Rev Charles Butterfield, rector of West Retford parish from 1857 to 1866. In the small chapel at the end of the north aisle, also known as the 'Mary chapel', there is a reredos by Sir Ninian Comper.