Anglo-Saxon features include a tall, narrow nave and chancel, late Anglo-Saxon wall-arcading in the north west aisle and traces of a Saxon door.

[4] The building has been altered and expanded over the years but the nave and a tiny window in the north side of the chancel are original features.

On the north wall of the chancel are 12th-century frescoes depicting Saint Martin on horseback, escorted by attendants, dividing his cloak and giving one half to a naked beggar.

On one of the walls a number of red stars have been painted, possibly representing plague deaths in the 17th century.

[2] During the Great Fire of Wareham in 1762, the church was used as a temporary refuge for those who had lost their homes.