 St Mary's Lodge was built around 1470 as an addition to the late 12th-century buildings that formed the gatehouse at the main entrance to the abbey, – now the Marygate entrance to the gardens.Some remains of the 12th-century gatehouse can still be seen, in particular the archway attached to the side of the lodge.The lodge is built of stone, and does not contain timber framing like the nearby Hospitium.