Howard decided to build a new house at Arlington Street in London, purchasing land in 1734. She employed James Gibbs as architect and commissioned a marble fireplace from John Michael Rysbrack. Whilst the construction was underway, she lived on Pall Mall. The work was completed in 1740, with skilled craftsmen working on the interior. The house was partially demolished in the 1930s and now serves as the clubhouse for the Royal Over-Seas League. Widdrington died in 1748. By this point, Howard was an absentee landlord, managing her northern estates from London. The last recorded time she was in Stonyhurst was 1734. She continued to support Jacobite initiatives but was not linked to the rising of 1745.