The largest window, which sits under a hoodmould, is in the east end of the chancel; it is a three-light lancet with prominent tracery in the curvilinear/reticulated style. The window dates from the 14th century, which may make it the same age as a small window next to the porch, which has twin lights with foliated heads set below a quatrefoil in an ogive arch. Both windows also have scrollwork drip-moulds. Most other windows are plain trefoil-headed single lancets. The blocked doorway in the modern north aisle is the oldest surviving part of the church. Its lintel is thick and sits below 11 voussoirs, each about across. Below the lintel, the former opening is high and wide; gradual settling into the ground has masked its original height. The jambs are made up of five stones of equal height, but the uppermost is wider because it served as an impost. Inside the church, the jambs and arch are visible, but there is no lintel. The wall of the chancel retains a trefoil-arched piscina added during the 14th-century restoration work. The font—a "rather florid circular" example—dates from 1864, and the church possesses Eucharistic objects dating from the 16th and 17th centuries, such as a chalice of 1568 and a paten dating from 1666. The west wall has a wide range of old carved prayer and commandment boards, which are a common feature of Sussex churches. Ancient examples of graffiti, consisting of etched crosses and dates, also survives inside; such "curious carvings" are also common in Sussex. All Saints Church was listed at Grade II* on 13 October 1952. Worship at All Saints is in the Open Evangelical style. There is a Sunday school and regular youth group. All Saints is the church in the Benefice of Patcham All Saints, which also incorporates the Church of the Ascension in Westdene, a postwar suburb west of Patcham. This is a modern building of brick and glass, designed in 1958 by architect John Wells-Thorpe. The ecclesiastical parish of All Saints covers the north of Brighton and its rural hinterland, incorporating Withdean, Westdene, Patcham, Hollingbury, part of Preston (as far south as Preston Park railway station), and the scattered residential buildings north of the A27 Brighton Bypass and south of Pyecombe.