Northwood, United Kingdom

Northwood had a manorial grange in 1248, which may have occupied the site of the later Northwood Grange. The monks of the Bec Abbey who lived at Manor Farm in Ruislip in the 11th century owned this grange. A few cottages at Northwood are mentioned in the 1565 manorial survey. Two hundred years later the shape of the hamlet, composed of a few farms and dwellings scattered along the Rickmansworth road, had altered little except for the addition of Holy Trinity church. Robert Cecil, 1st Earl of Salisbury had 568 acres (230 ha) of Ruislip cleared of forest.

Northwood, however, elevated and separated from the rest of the parish by a belt of woodland, took until the 19th century to form a village — 350 acres (140 ha) in the manor of St. Catherine's were inclosed under the Ruislip Inclosure Act 1769 (9 Geo. 3. c. 67 Pr.) privatizing land which lay west of Ducks Hill Road, including West Wood (now Mad Bess Wood) which was common ground. A further 3,000 acres (1,200 ha) of Ruislip parish were inclosed by the Ruislip Inclosure Act 1804 (44 Geo. 3. c. 45 Pr.). The character of the area in providing for Northwood and Northwood Hills to have the majority of open spaces as opposed to housing land was begun by transfers of open space land to the public as early as 1899. The open nature of the district attracted three hospitals to move or establish in this part of the parish: Mount Vernon Hospital, St. Vincent's Orthopaedic Hospital and Northwood, Pinner and District Hospital.

A land survey of Northwood conducted in 1565 by King's College, Cambridge, the new lords of the manor of Ruislip, recorded ten houses and several farms.

By 1881, the population of Northwood had reached 257, with 62 houses recorded from 41 people in 1841. David Carnegie owned the large Eastbury Park Estate in the north of the area in 1881. In 1887, the Metropolitan Railway was extended from Harrow-on-the-Hill to Rickmansworth and Carnegie sold his land to Frank Carew for development for £59,422. Northwood station opened in August that year. Carew stipulated the prices for the new housing he had built, with the cottages along the west side of the High Street priced at £120. He had hoped these would be owned by the staff of the larger houses. The High Street itself had been a track leading on from Rickmansworth Road to Gate Hill Farm. The first shops opened in 1895 on the east side of the road, and included a hairdresser, butchers and a fishmongers. Carew sold the majority of the estate to George Wieland in 1892.

By 1902, the population had reached 2,500 in 500 houses and running 36 shops. In 1904, the Emmanuel Church opened in Northwood Hills, designed by Sir Frank Elgood, a local architect. It had been built in 1895, originally to serve as a school. Elgood later served as chairman of the Ruislip-Northwood Urban District Council.

Northwood and Pinner Cottage Hospital was built in 1926 as a memorial to the First World War, using donations from the Ruislip Cottagers' Allotments Charity.

Northwood is home to Northwood Headquarters, in the grounds of Eastbury Park, the estate purchased by David Carnegie in 1857. The Royal Air Force took over the site in 1939 for the use of RAF Coastal Command which made use of Eastbury house and also created a network of underground bunkers and operations blocks, at which time the house was used as the leading Officers' Mess, though was subsequently damaged by fire. The RAF vacated the site in 1969, and it is now the location of the British Armed Forces Permanent Joint Headquarters (PJHQ) for planning and controlling overseas military operations, together with the NATO Maritime Command.

A new community centre on the town's high street, replacing an older building, was officially opened by the local MP Nick Hurd in September 2012. The new building was named the Kate Fassnidge Community Centre after the Uxbridge landowner who donated some of her land to the borough, and replaced a derelict dining club that had originally been a Ritz cinema.

Northwood was listed as the UK’s most expensive place to buy property because of its suburban setting and good transport links to Central London.