The Hoo is a Grade II* listed building in the Dacorum local planning authority area, England. First listed on 26 January 1967. Country house. 11 related planning applications.

The Hoo

WRENN ID
secret-crypt-fog
Grade
II*
Local Planning Authority
Dacorum
Constituency
Harpenden and Berkhamsted MP: Victoria Collins (LD)
Country
England
Date first listed
26 January 1967
Type
Country house
Address
The Hoo, Ledgemore Lane, Great Gaddesden, HP2 6HD
OS grid reference
TL 036 127
Coordinates
51.80403, -0.49803
Source
Historic England listing

Also on this page: sale history · EPC · related consents · flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Hoo is a country house with a complex history. The western range, dating back to circa 1683, was originally built for Dr. Edward Green as a wing of a larger, half-H shaped house that faced south. This earlier southern portion was demolished around 1948. An eastern range was constructed circa 1948 and subsequently linked to the western range in circa 1968. The western range is constructed of plum brick in Flemish bond, incorporating blue headers and red brick dressings. It features a steep roof covered with old red tiles.

The western façade is two storeys and attics high and symmetrical, with three windows. The central bay projects forward, featuring a heavy Roman Doric doorcase with a triglyph frieze, columns, and a triangular pediment. Within the doorcase is a six-panel raised and fielded door set in panelled reveals and a moulded surround. The façade includes a chamfered plinth (now plastered), a moulded band, a wooden eaves cornice, and flush box sash windows with 6/6 panes, each with a flat gauged arch. A segmental head and arch sits above the window in the pediment. The south end has two similar windows on each floor, and a smaller sash window within a pedimented gable featuring a dentilled cornice at eaves level.

Inside the western range, a late 17th-century wooden fire surround is found in the north room, complete with an ornate spit-rack over it, featuring a cornice. A contemporary fire surround with a cornice shelf and central block is also present. The room features ovolo moulded half panelling to the walls, with H-hinges. There's shelving opposite the fireplace, with shaped brackets and a cornice. Ovolo moulded six-panel doors also use H-hinges. Cellar stairs lead up. In the stair and entrance hall are tall ovolo panels, a moulded dado, and cornice. A closed-string staircase with barley-sugar balusters ascends to the attic. A six-panel door with bars leads to segmental headed sashes. A room on the right-hand first floor displays reeded moulding with a patera around the ceiling’s margin. The room’s heavy moulded cornice surrounds a 19th-century marble fire surround. The original fire surround may have been a flat marble one. Dado panelling and two-panel doors with H hinges are visible. The cut-string stair to the attic exhibits scrolled ends to the treads, remaining barley-sugar newels, and a swept oak handrail.

Local climate

The Hoo sits in a drier-than-average part of the UK, with an average of 730 mm of rain a year. This makes it drier than 78% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 77% of listed buildings.

It experiences an average of 36 freeze-thaw cycles a year, more than 64% of listed buildings. Of these, 17 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 2 transactions since 2016
  • Related listed building consents — 11 applications
  • Detailed attributes — period, style, materials, features
  • Flood risk assessment
  • Radon risk assessment
  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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