Gardnor House is a Grade II* listed building in the Camden local planning authority area, England. First listed on 11 August 1950. House. 2 related planning applications.

Gardnor House

WRENN ID
under-lantern-marsh
Grade
II*
Local Planning Authority
Camden
Constituency
Hampstead and Highgate MP: Tulip Siddiq (Lab)
Country
England
Date first listed
11 August 1950
Type
House
Address
Gardnor House, Flask Walk, NW3 1HA
OS grid reference
TQ 265 858
Coordinates
51.55741, -0.17543
Source
Historic England listing

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

Description

Gardnor House is a detached house built around 1736 for Thomas Gardnor. It was refronted at both the back and front in the early 19th century. The house features a slated mansard roof with dormers and tall brick chimney stacks.

The exterior consists of three storeys and attics. The north-east elevation is made of 19th-century yellow stock brick and includes plain brick clasping pilasters at the corners. It has a double front with three windows and a 20th-century reproduction Georgian doorcase that has a console bracketed hood and a part-glazed door. The ground floor has French windows with margin glazing, while the upper floor has recessed sash windows, all topped with gauged brick flat arches. A parapet completes this elevation.

The north-west elevation is patched brown brick, also featuring plain brick clasping pilasters. It has a ground floor French window and a central first-floor window with a gauged red brick round arch and keystone, topped by a tall segmental-arched sash with a gauged red brick head, dressings, and a moulded brick sill band with paterae linking to the keystone below. There is a small sash window to the right, and the elevation retains original lead rain-water heads and pipes, one inscribed with the year 1736.

The south-west elevation is constructed of 19th-century yellow stock brick with plain brick clasping pilasters and features a central three-window bowed bay that rises the full height of the building, along with a parapet.

The south-east elevation is made of brown brick with plain brick clasping pilasters and also has a parapet.

The interior has not been inspected but is noted to retain a good quality interior, including a wide 18th-century panelled open staircase with turned balusters, column newels, and carved brackets. Some original doorcases remain, while most rooms feature early 19th-century cornices, doorcases, and fireplaces.

Local climate

Gardnor House sits in one of the driest parts of the UK, with an average of 690 mm of rain a year. This makes it drier than 98% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 98% of listed buildings.

It experiences an average of 30 freeze-thaw cycles a year, fewer than 66% of listed buildings. Of these, 13 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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  • No EPC on record for this property
  • Sale history — 2 transactions since 2019
  • Related listed building consents — 2 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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Nearby listed buildings

  1. South East Garden Wall to Gardnor House Grade II 18 m
  2. K6 (South) on Island Outside Number 71a (Number 71a Not Included) Grade II 28 m
  3. K6 (North) on Island Outside Number 71a (Number 71a Not Included) Grade II 29 m
  4. The Wells and Campden Baths and Wash Houses Grade II 40 m
  5. Garden Wall, Railings and Gate to Number 75 Grade II 50 m
  6. 75, Flask Walk Grade II 56 m
  7. 40, New End Square Grade II 59 m
  8. 38, New End Square Grade II 61 m
  9. Three Lamp Posts on North Side Raised Pavement Grade II 62 m
  10. Entrance Gates and Flanking Wall to Burgh House Grade II 77 m