Near St Mary's is a tithe barn that was built for New College, Oxford. In the 1970s Jennifer Sherwood dated it mainly to the 14th century but English Heritage dates the earliest parts of the building to 1422. The walls are of ashlar marlstone and the roof is of Stonesfield slate. In the 17th century the barn was reduced to its present length of five bays and partly rebuilt. In about 1877 it was altered for Lawrence Palk, 1st Baron Haldon. The barn has similarities with tithe barns at Swalcliffe and Upper Heyford, both of which were also built for New College early in the 15th century. Because of its post-Medieval alterations it is only a Grade II listed building.