The 35 m (116 ft) high tower of St Andrew's is one of the tallest in Somerset and is an important feature in the landscape surrounding Blagdon Lake.
Built in the C15th the tower is the oldest part of the church. The chancel, nave and aisles, although C15th in style, were rebuilt in 1907–08 by Sir Frank Wills.
Above the altar is a striking painting by Oswald Moser (1874–1953) The Last Supper, purchased in 1907 for the church by Lord Winterstoke. It is unusual in English churches to have a painting behind the altar and the picture is a focal point in the chancel. The composition is in the style of Caravaggio – the models came from the unemployed on the Chelsea embankment.
The Space@St Andrew's at the back of the church is used by a wide range of community groups, and the church also hosts concerts for organists and choirs as well as other performances and festivals.
Pipistrelles and brown long-eared bats have both been recorded inside the church. The brown long eared bats appear to be roosting in the chancel void and wall cavity behind the sanctuary from the outside via a ventilation grille in the east wall and then gaining access to the interior via a hole in the east corner of the chancel.
The Bats in Churches project is working with the church to find a way to retain the existing bat roost in the cavity wall and chancel roof void but protect the Moser picture from bat urine and droppings.