 Even though the house has been through many renovations, a great deal of 17th-century fittings still remain such as carved woodwork, plaster and alabaster.Robert Smythson heavily influenced Burton Agnes Hall, however comparing the Smythson plan with the house as built it is clear there are several differences.In the plan all four of the great bay windows at the corners of the main front are five-sided but in the building two are semicircular.