The principal part of Gunby Hall was built at the end of the 17th century for Sir William Massingberd on the site of a small manor house that had once belonged to a family called Gunby. The 3-storey, 7-bay house was built of red brick, some brought from Holland in 1699, and the rest probably dug from the brickfield that is now the Icehouse Pond in the park. The exterior is distinctly formal; the only ornament is a doorway on the west front with an elaborately scrolled, broken segmental pediment enclosing a cartouche of arms. The interior decoration is restrained with simple early 18th-century panelling and an early Georgian staircase with a moulded ceiling.