The tracery mouldings and corbels in the interior are extremely elegant; there are also some fine specimens of screen work: it consists of nave, chancel, side aisles, and an embattled tower, surmounted by an octagonal spire, and contains a peal of thirteen good bells.

There was originally a late 12th-century church on the site, the only evidence of which is the east end of the south wall of the nave with a blocked window, and the marks of its steeply pitched roof on the west face of the tower.

The church was enlarged by Sir William de Odingsells with the chancel, and a vaulted chamber and chapel dedicated to St Alphege to the north of it.

A north aisle with a chapel of St Thomas Becket was added to the nave and some remains of an arch between the two still exist.

[4] The top section of the tower was constructed in 1470, much later on than the lower part, probably near the date of other 15th-century work, likely undertaken before the nave and aisles were completed.

The south aisle, owing to a structural weakness in the arcade and the pressure of the nave roof, collapsed in 1751 and was again rebuilt almost immediately afterwards, but the arcade and aisle again failed to resist the thrust of the roof and in 1939 were heavily shored with timber until the work of restoration was undertaken.

In 1879 the west window was renewed and other repairs executed, including work to the roofs of the nave and aisles, which were stripped and rebolted.

St Alphege has an active music department, with choirs for boys, girls, ladies and men who sing services both separately and in various combinations.