Otterspool House and the Flat is a Grade II listed building in the Hertsmere local planning authority area, England. First listed on 12 August 1985. Former coaching inn. 7 related planning applications.

Otterspool House and the Flat

WRENN ID
ruined-hearth-summer
Grade
II
Local Planning Authority
Hertsmere
Constituency
Hertsmere MP: Sir Oliver Dowden (Con)
Country
England
Date first listed
12 August 1985
Type
Former coaching inn
Address
Otterspool House and the Flat, Otterspool Lane, Aldenham, WD25 8AX
OS grid reference
TQ 128 988
Coordinates
51.67706, -0.36994
Source
Historic England listing

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

Description

Otterspool House and The Flat is a former coaching inn, now student housing, dating from the early to mid-18th century, with 19th-century extensions and alterations, and a link to a late 18th-century house. The main house is built of red brick with a hipped slate roof. It originally had five windows, though the original front now faces the garden. A late 19th-century full-height canted bay projects to the left of centre, with the ground floor of the bay being cement rendered and featuring banded rustication. A mutuled cornice runs along the ground floor. There are traces of an arch over the ground floor on the left, potentially the original entrance. The windows are glazing bar sashes with flat arched heads, and there are two blind windows on the left side. The building has a dentilled timber cornice. An early 19th-century addition in red brick, set back from the main house, is located to the left, and includes an entrance with a semi-circular fanlight. The road frontage now features a 19th-century gabled porch, with the second bay from the right acting as the entrance. A central stack is present at the front, along with a cross-axial stack on the later addition. The remnants of a large, late 18th- to early 19th-century grotto is attached to the right return from the garden, extending over three sides of a rectangle. It was likely associated with the consumption of water from the nearby pool, a fashionable pastime at the time. There are two-storey and single-storey links to the late 18th-century house. A 20th-century porch addition is present to the right on the road. The rear features a dentilled timber cornice and an external stack to the front left.

Local climate

Otterspool House and the Flat sits in a drier-than-average part of the UK, with an average of 710 mm of rain a year. This makes it drier than 86% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 85% of listed buildings.

It experiences an average of 31 freeze-thaw cycles a year, fewer than 61% of listed buildings. Of these, 15 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 — 1 transaction since 2014
  • Related listed building consents — 7 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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