Handcock had originally been an opponent of the Act, but was promised a peerage should he vote in favour of it. He duly succumbed and finally, in 1812, Handcock was created 1st Baron Castlemaine. The Baron decided to create an appropriate stately home on his lands at Moydrum, and therefore asked architect Richard Morrison to remodel and enlarge an existing house belonging to the family there, built 1750.
Handcock initially opposed the Act but was promised a peerage if he voted for it. He eventually agreed and, in 1812, became Baron Castlemaine.  He then commissioned architect Richard Morrison to remodel an existing house at Moydrum, built in 1750, into his new stately home.