Frogmore House is a Grade II* listed building in the Watford local planning authority area, England. First listed on 26 August 1952. House. 4 related planning applications.

Frogmore House

WRENN ID
twisted-loft-tarn
Grade
II*
Local Planning Authority
Watford
Constituency
Watford MP: Matt Turmaine (Lab)
Country
England
Date first listed
26 August 1952
Type
House
Address
Frogmore House, High Street, WD17 2HY
OS grid reference
TQ 116 957
Coordinates
51.64957, -0.3871
Source
Historic England listing

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

Description

Frogmore House is a Grade II* listed building dating from 1716. This red brick house stands three storeys high and features hipped plain tile roofs. The road-facing side has a four-window range, while the formal south front displays five windows. The road front is distinguished by a moulded wood eaves cornice, with blank openings in the left bay of the ground floor and the two left bays above. The windows have gauged brick flat heads and exposed box sashes, with 19th-century sashes included. There are raised brick bands between the floors. A fine doorcase with fluted pilasters is set against a channelled rusticated surround, topped by a Doric frieze with relief-carved metopes. A flat hood is supported by ornately scrolled brackets, and a rainwater head is dated 1716. The south front has a rebuilt parapet, similar window arrangement, and brick bands, with small rectangular sunk panels above the ground and first-floor windows. The centre bay slightly projects, featuring a moulded wood doorcase with a modern flat hood on finely carved brackets. There is a projecting later extension on the ground floor's left side, and the north wall is rendered. Inside, the panelled hall includes an open well staircase with carved brackets, twisted balusters, and column newels.

Local climate

Frogmore House sits in one of the driest parts of the UK, with an average of 700 mm of rain a year. This makes it drier than 93% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 91% of listed buildings.

It experiences an average of 30 freeze-thaw cycles a year, fewer than 65% 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 — 2 transactions since 2021
  • Related listed building consents — 4 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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