Mangrove Hall and Attached Outhouses is a Grade II listed building in the North Hertfordshire local planning authority area, England. First listed on 24 October 1988. A Late C17 House. 1 related planning application.

Mangrove Hall and Attached Outhouses

WRENN ID
veiled-pilaster-jackdaw
Grade
II
Local Planning Authority
North Hertfordshire
Constituency
Hitchin MP: Alistair Strathern (Lab)
Country
England
Date first listed
24 October 1988
Type
House
Address
Mangrove Hall and Attached Outhouses, Mangrove Green, Offley
OS grid reference
TL 124 240
Coordinates
51.90407, -0.36749
Source
Historic England listing

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

Description

Mangrove Hall is a house with attached outbuildings, dating from the late 17th century, with renovations occurring in the 19th century when the outbuildings were added. The house is brick-built, incorporating timber framing in the rear wing and framed cross-partitions. The exterior is roughcast, with steep roofs of old red tiles. The outbuildings are of red brick. It is L-shaped, with two storeys, a cellar, and attics. The main facade, facing west, is three windows wide, with a smaller window above a gabled porch. It has casement windows and three gabled dormers on the roof slope. Parapets are present on the end gables. The south side has three windows on each floor, and a side door with a gabled hood on brackets. A small two-storey block has been added next to the gabled stair tower, in the angle of the 'L', with a low, former keeping cellar to the rear. The west front is symmetrical. Inside, a large internal chimney is situated in the middle of the western range, with a lobby entry on the west and a large stair tower on the east. The framing of the attic floor clasps the chimney. The ground floor has chamfered cross-beams with ogee stops. The kitchen wing on the southeast has a parallel outshut to the north, and an east gable chimney with an open fireplace. A service room extends to the east half, open to the roof with an east gable chimney. A closed-string stair continues to the attic. The staircase has turned balusters, square newels with pendants and ball finials. A 18th-century dentilled wooden fire surround with a stone insert is found on the first floor. Moulded plank doors and iron hinges lead to the attics. The roof structure features a clasped-purlin arrangement, with inclined queen-posts and cambered tie-beams at each gable. A plat-band on the east gable of the kitchen wing is now located inside an adjoining outhouse.

Local climate

Mangrove Hall and Attached Outhouses 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 80% 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 37 freeze-thaw cycles a year, more than 70% of listed buildings. Of these, 18 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 — 7 transactions since 2002
  • Related listed building consents — 1 application
  • 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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  6. Home Farm Nos 1, 2, 3, 4 and Outhouses Linked to the North Grade II 749 m
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