In 1595 (37th Eliz.), the manor of Stagenhoe was conveyed to William Hale, of King's Walden. His seventh son and eleventh child, John Hale, was knighted in 1660, built Stagenhoe Manor House about that time, was sheriff of the county in 1663, and died in 1672. Dame Elizabeth, was the wife of this John Hale, and died one year after him. They were the last of the Hales of Stagenhoe ; their daughter, Rose, who died 1695, carried the property to Sir John Austen, of Hall Place, Bexley, he died 1689. His son, Sir Robert Austen (died 1706) sold it to the Heyshams.
The house of 1650 or 1660 was burnt in 1737, and a new house was built by Mr. G. T. Heysham, about 1740. In 1703, the manor and surrounding park was sold to Robert Heynsham, a Member of parliament and it remained within his family until 1833. In about 1869, it was sold to another parliamentarian James Sinclair, 14th Earl of Caithness.
The current manor was built in the 18th century, after a fire in about 1737. It has many 19th-century and later additions, including extensions to the rear and a porch on the west side. The main feature is the stuccoed south facade. The property was listed in 1968.
- "A History of the County of Hertford, vol 2". british-history.ac.uk. British History Online. Retrieved 24 September 2014.
- "Heynsham, Robert (1663-1723), of London and Stagenhoe". historyofparliamentonline.org. The History of Parliament. Retrieved 24 September 2014.
- "Stagenhoe Park (Sue Ryder Home), St Paul's Walden". britishlistedbuildings.co.uk. British Listed Buildings. Retrieved 24 September 2014.
- "Stagenhoe Park Certified Location". ukcampsite.co.uk. UK Campsite. Retrieved 24 September 2014.