Grounds and garden
View of Bramshill House from its grounds to the south
The house is set in 262-acre (106 ha) of grounds, which include an 18-acre (7.3 ha) lake north of the house. The grounds form part of a Registered Historic Park that received a Grade II* listing in 1984; this was subsequently upgraded to Grade I in September 2017. Under this designation are the 25 acres (10 ha) of early 17th-century formal gardens near the house, the wider 490 acres (200 ha) medieval park, landscaped from the 17th to the 20th century, with 250 acres (100 ha) of woodland and buildings including an icehouse and a folly known as Conduit House. Parts of the park have been used for commercial softwood production since the 19th century.
To the west of the house is Peatmoor Copse and to the east Bramshill Forest, and the grounds contained what was known as the "Green Court" and the "Flower Garden" at the time of William Henry Cope in the 1880s. The Grade I listed gatehouse dates to the time of the Foxleys. The fir trees in the grounds are reputed to have been planted "as a memento of his former home" by James I, who brought them from Scotland. The formal gardens were first laid out by Edward la Zouche, a horticulturist. Sir John Cope redesigned the gardens and continued the planting of trees in the park. At the close of the 18th century the grounds were re-landscaped to be less formal, and some areas in the south were returned to parkland.
Bramshill Park was conceived as a "hunting box" for Henry Frederick and became a popular estate for hunting. On 24 July 1621, while hunting in the park, George Abbot, Archbishop of Canterbury, accidentally shot and killed one of the gamekeepers with his crossbow. An inquiry cleared him of murder. Another notable clergyman/hunter who frequented Bramshill was Charles Kingsley, rector of Eversley, who hunted fox and deer and collected butterflies there and frequently took his family and friends. Kingsley was reportedly especially enamoured of the fir trees, which he considered "a source of constant delight", fondly naming them "James the First's gnarled giants". In the 19th century, Sir John Cope, a friend of Kingsley's, was known as a supporter of the fox hunt and especially as a breeder of fox hounds. The opening of the season at Bramshill in the late 1840s was noted in the British hunting press.
The main avenue approaches from the southwest, through an arched gateway formed by two Grade II listed early 19th-century lodges, before crossing the Broad Water formed by the River Hart by a Grade I listed early 19th-century bridge with two arches. There are separate listings for other structures near the house, including the Grade I listed early 17th-century triple-arched gateway on the route to Reading to the northeast of the house, Grade I listed early 17th-century boundary walls and turrets to the south and west, Grade II listed boundary walls and gate-piers to the west, including the kitchen garden, Grade I listed garden walls and gateways to the north and east, and the Grade II listed late 18th-century stable block to the north.