Previously enclosed and used as a vestry and then an organ chamber, the south porch became a chapel in 1903. In 1988, the side chapel was remodelled and dedicated as the Chapel of the Holy Spirit. The parish and the Bicentennial Council of New South Wales funded the redesign which saw the removal of the infilling from between the columns of the portico and its replacement with stained glass. The award-winning "Creation Window", designed by Australian artist David Wright, spreads across the three walls and represents the interaction of earth, air, fire and water, symbolic of the action of the Spirit in creation, in life and in rebirth in Christ. The new furniture for the chapel was designed by Leon Sadubin.