File:Northleach, SSPeter & Paul church interior (48612021321).jpg

The church dates from the twelfth century onwards, although much of it was rebuilt in the perpendicular style by the wool merchant John Fortey who left £300 for the task. His Memorial brass is in the north aisle.

The church was restored by James Brooks 1877-84, the Lady Chapel was refurnished by F. C. Eden 1927-8, and there was further restoration in 1961.

There is a western tower, clerestoried nave with north and south aisles, south porch, and chancel with north and south chapels. The church is constructed in ashlar with stone slate and lead roofing. The chancel dates from the mid-fourteenth century. Its pitched roof is visible through the nave gable window. The hundred foot tall tower was built sometime later in the fourteenth century, before the present nave was begun. The south aisle is probably early fifteenth century and the nave and clerestory date from around 1450. The nave has five-bay arcades with unusual concave sided octagonal piers and low arches. There are large four light clerestory windows above. The east gable of the nave has a nine light window above the chancel arch. The Lady Chapel, south of the chancel, has the date 1489 on a roof corbel. It was built by William Bicknell and his wife Margaret who were probably Lords of the Manor at the time. The south porch is of two stories and has several original statues and has a vaulted ceiling inside. It was built around 1500 and is described by many as the finest in England. The upper floor or parvis had a fireplace and oven and was living accommodation for the Priest.

There is a fourteenth century octagonal font with carved heads supported by Angels playing musical instruments, with devils being crushed at the base. It has a modern font cover. There is a fifteenth century stone goblet shaped pulpit, and remains of wall paintings on the south side.

The church has a unique collection of brasses, mostly to wool merchants dating from circa 1400 to the mid-sixteenth century. There are eight floor brasses, and two set on the wall.

The east window is by Christopher Webb 1963, and there are remnants of mediaeval glass in the traceries of the nave windows.

There is a two manual organ by Thorold and Smith, 1883. It was enlarged by Bishop and son of Ipswich in 1990.