In 1669, vast parts of the original Manor House were demolished to make way for a larger, more lavish extension, retaining of course, the Great Hall and Oak Room.
In 1845, Abington Manor was sold to a Londoner who leased out the Manor to Dr Octavius Pritchard who used the property as a mental asylum. It remained as an asylum until 1892. Conditions in the asylum are not believed to have been overly cruel or unpleasant, however it has been reported that during this time two patients hung themselves. The property further exchanged hands in 1897 when it was given to the people of Northampton. It has remained as a museum until present day