[2][3] The walls are up to 7 feet (2.1 m) thick, although there is a lot of decorative stonework, including faces around one the oriel window on the south-west side.

[4] The original entrance was located at the bottom of the stair-tower, with the main hall, maids room and pantry on the first floor and the upper levels divided into multiple chambers.

Margaret Kennedy, Countess of Cassilis wrote from the castle in 1578 about wishing to order some luxury items.

[15][1] By the start of the 19th century, it had fallen into disrepair and in 1805 part of the original castle was demolished and the main entrance was modified.

[8][9] Maybole became more accessible in the 19th century thanks to the efforts of Niven of Kirkbride who opened up roads through moats and outer fortified walls.

[12][16] The castle was renovated and expanded with the addition of rubble-built two-storey gabled wings on the west and south sides, sometime before 1856.

[7] Around 1837, Robert Brandard produced an engraving of the castle,[17] based on original works by William Henry Bartlett.

[18] Later, in the 1890s, architect and artist Charles Rennie Mackintosh examined the castle as part of this own "perpetual interest in recording the decorative details of the buildings of the 'old national style'".

[16] It become a category A listed building in April 1974, along with its rubble-built garden walls, in recognition of its national importance as the town mansion of the Earls of Cassillis.

[32][33][34] Mark Fletcher, Chair of Maybole Community Council, was quoted as saying "This generous grant from Scottish Government secures a sustainable future for the castle.