This stairway was added when the top stage was constructed in the late C14. The powerful tower arch has a pointed, double chamfered and hoodmoulded arch supported by half round responds with semi- octagonal capitals. Note how the abaci are extended to form an internal stringcourse to the nave's west wall.  Above this archway is a blocked C17 or C18 doorway which afforded entry to a musician's gallery which was taken down in 1882 when the church acquired its organ.

The south aisle and chantry chapel

In the west wall of the south aisle is a C15 depressed arched window possessing three cinquefoil lights. To the east of the porch is a small C14 two-centred arched window of two trefoil lights over which is quatrefoil. Further east is another depressed arched window. This is also of three lights. However they are uncusped, suggesting a C16 date. Like the window opposite to it in the nave's north wall, this window has been fitted into the larger embrasure of an earlier window. The window round the corner behind the organ in the east wall was unglazed in 1882 when the organ chamber was built, but it retains its rib work, and is similar to the adjacent window in the south wall. A small, round arched niche with C14 trefoil cusping is located at the east end of the south wall. This houses a piscina, a small basin where the ablutions from the mass were poured away. This shows that an altar once stood here. The openwork window mentioned above once contained a stained glass figure of the Blessed Virgin Mary in a 'full state of pregnancy', with a label 'Erultate mecum pro infante in utero meo', signifying that it represented one of the twenty-five joys of the Virgin. There were also the Woodford arms shown impaling the ermine cross 'saltire' of Nevill. These were recorded by the early Leicestershire antiquary Francis Peck, who was rector of Goadby Marwood, when he visited Sproxton church in 1729, but by 1794 when john Nichols came, only a fragment of the figure of the Virgin still remained. This fragment probably survived until 1882, when, not being recognised for what is was, it would have been discarded. The presence of the Virgin Mary confirms that the altar in this side chapel was dedicated to Our Lady. Regarding the presence of the arms of Woodford impaling Nevill, John Woodford, who was referred to earlier with regard to the architecture of the tower, died in 1401, leaving a son, Robert. On Saturday 5th May 1403 Robert married Isabel Nevill in the church of Holy Trinity, Rollestone, Notts., and the stained glass