Maryon Hall (Number 19) and Maryon House (Number 21) is a Grade II listed building in the Camden local planning authority area, England. First listed on 14 May 1974. Residential building. 10 related planning applications.

Maryon Hall (Number 19) and Maryon House (Number 21)

WRENN ID
waning-foundation-dawn
Grade
II
Local Planning Authority
Camden
Constituency
Hampstead and Highgate MP: Tulip Siddiq (Lab)
Country
England
Date first listed
14 May 1974
Type
Residential building
Address
Maryon Hall (Number 19) and Maryon House (Number 21), Frognal Lane, NW3 7DB
OS grid reference
TQ 260 855
Coordinates
51.55455, -0.18369
Source
Historic England listing

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

Description

Maryon Hall (number 19) and Maryon House (number 21) are a detached house, originally built around 1793 and later divided into two residences. The house may have been built by T Pool and was converted in 1896 by Francis Tasker. Number 19 was subsequently altered in 1964 by John Brandon-Jones. The exterior is multi-coloured stock brick with a high slate mansard roof featuring pedimented dormers. It is two storeys with attics and a basement. Number 19 has two windows and Number 21 has two windows plus a slightly recessed one-window entrance bay. The entrance to Number 21 features a later 19th-century doorway with a segmental open pedimented canopy, sidelights, a fanlight, and a panelled door. The main entrance to Number 19 is on Chesterford Gardens and has a prostyle Doric portico and a later 19th-century altered doorway. Gauged brick flat arches frame the recessed sash windows and first-floor shutters. Number 19 has a canted bay window rising through the ground and first floors, while Number 21 has a canted bay window on its ground floor. A parapet tops the building. The interior has not been inspected.

Local climate

Maryon Hall (Number 19) and Maryon House (Number 21) 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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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 1 transaction since 1995
  • Related listed building consents — 10 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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