[4][5] In 1796, a further more extensive redesign was undertaken by Thomas Harrison (1744–1829), the Yorkshire-born architect noted for working in the Grecian manner.
Part of the Harrison design, a semi-circular bay on the south front is decorated with three Coade Stone panels[6] depicting reclining figures.
The 7th Earl, over some 30 years, commissioned 14 architects to produce plans, especially for the completion of the north front entrance porch.
[10] For example, a massive columned portico designed by Sir Robert Smirke was made 1808 to 1810 but never installed and became the entrance to the Perth Sheriff Court in 1819.
[11] The north front was finally completed with the addition of a three bay porch in 1865–66 to a design by Charles Heath Wilson, the low east and west wings in their present form not until 1874.