Main, N door to church at the base of the tower with C13 Early English doorway with shafts and stiff leaf capitals flanked by blank arches
Abutting the NE tower of the corner a late C16 classical gateway into the churchyard
To the W of the tower, a large two storied, gabled porch (the upper room perhaps a priest¿s lodging). Beyond the porch, the N wall of the outer N aisle has 3 C14 windows
INTERIOR: The interior of the church was heavily remodelled in the C15
The chapel roof is panelled and has a very fine painted scheme of c.1390 with foliage and figures depicting the Tree of Jesse with a painted inscription recording the chapel's commissioning and repair
The rest of the aisle has an early C15 roof
The central nave and chancel, with a clerestory to the nave, are C15
The inner S (St Katherine's) aisle is early C15, the outer S (or Reade) aisle 1539, the roof dated and with the initials I.A and K.A. for John and Katherine Audlett
The chancel interior was refitted in flamboyant Early English style in 1869-73 by Henry Woodyer, who inserted a new E window, sedilia, tiled floor and wooden rood screen
Pulpit of 1636, moved from the nave and cut down in 1849
White marble font, a copy of that at Sutton Courtenay, by H P Peyman of Abingdon, shown at the Great Exhibition in 1851
Font cover dated 1634
The old font is said to be buried beneath the present font
Chancel sedilia, tiled floor and wooden rood screen of 1869-73
Glass includes several late C19 and early C20 windows by C E Kempe
The interior, previously reordered in the C18, C19 and probably the C17, was re-ordered in 2003-4, with the pews repositioned to face the centre of the church where a low platform of the altar has been introduced
The body of the church was refloored with simple grey tiles
Abingdon Abbey to the E of St Helen's was founded in the C7 and refounded in the C10, and the town was an important Saxon site