Hatton became wealthy through his progressing career and the Queen's fondness for him, and in 1583 he embarked on building at Holdenby, Northamptonshire, what was to be the largest privately owned Elizabethan house in England. It had 123 huge glass windows at a time when glass was very expensive – window numbers became a way to show wealth. It had two great courts and was as large as Hampton Court palace. It was three storeys high and had two large state rooms, one for himself and another for the Queen, should she ever stay, which she never did.