The 14th century Chapel constructed of flint and stone sits on the South East corner of the main house. Much altered over the centuries the decoration is that of the earliest Gothic Revival, begun in 1759, with additions in 1797. The stained glass windows were executed by Francis Eginton (1737-1805). The tower, built in 1416, is one of the earliest known instances of brick being used as a building material in this part of England since the departure of the Romans one thousand years earlier. The Stations of the Cross were carved by Jozef Janas, a Polish prisoner of war in WWII and given to Stonor by Graham Greene in 1956.
In 2014 the Chapel received a grant to re-tile the Chapel and Clock Tower roofs, and improve the building’s rain water system.