File:Burnham Norton, St Margaret's church interior (29110015982).jpg

The oldest part of the church probably dates from the 11th century, that is the tower. The nave and aisles are from the 13th century, chancel 14th century, and clerestory added in the 15th century.

There is a round west tower, nave with north and south aisles, clerestory, chancel, and north porch. The church is built in flint with stone dressings, and slate roofs. The interior is whitewashed.

The doorway into the tower may be Anglo-Saxon, the upper part having honeycomb brick windows to the belfry, and there is an embattled parapet. The nave has a 13th century five bay arcade on the north aisle with short circular piers, the south aisle is slightly later, the western end is 14th century with octagonal piers. The eastern arches have a parclose screen which crosses the nave about halfway. The Rood screen has date of 1458. The Rood stairs are to the north There are fragments of wall painting above the chancel arch.

The chancel has 13th C. lancets, the only stained-glass window in the church is a two light east window depicting Saint Margaret of Antioch and Saint Margaret of Scotland.

There is an excellent 15th century painted wineglass pulpit depicting the Latin Doctors of the church and portraits of the donors. There is also an early 17th century single decker pulpit with a tester.

The Norman font has a rectangular bowl and is on five piers. It has arches and diamond patterns.

By the north door there is an opening which is probably an old wafer oven.

There is a small modern organ by Pulham.