21, Duchess Mews W1 is a Grade II listed building in the Westminster local planning authority area, England. First listed on 15 June 1973. Mews building. 2 related planning applications.
21, Duchess Mews W1
- WRENN ID
- pitched-gateway-raven
- Grade
- II
- Local Planning Authority
- Westminster
- Constituency
- Cities of London and Westminster MP: Rachel Blake (Lab)
- Country
- England
- Date first listed
- 15 June 1973
- Type
- Mews building
- Address
- 21, Duchess Mews W1, City of Westminster, W1G 9DY
- OS grid reference
- TQ 287 816
- Coordinates
- 51.51936, -0.14531
- Source
- Historic England listing
Description
No. 21 Duchess Mews is a mews building dating from around 1775-76, designed by James Adam and associated with No. 21 Portland Place. The building features a stock brick front that has been altered, with a stuccoed "polite" east front facing the rear of the Portland Place house, and it has a slate roof. It is two storeys high with a basement and is five windows wide, with the central bay slightly advanced and topped with a pediment. The exposed brick basement includes a wide segmental gauged brick arch. The ground floor, partly obscured by 20th-century additions, has a blind semicircular archway that is recessed for two orders, flanked by empty niches. The imposts of the arch extend into a frieze adorned with fluting and rosette decorations. Above the frieze are two circular Coade stone medallions depicting mythological scenes in relief, with rectangular panels featuring a double swag motif on either side. The first floor has three recessed casement windows interspersed with two blocked window openings, and there is a moulded cornice and parapet with coping, along with a pedimented central bay.
Local climate
21, Duchess Mews W1 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 95% 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 35 freeze-thaw cycles a year, more than 57% of listed buildings. Of these, 16 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
- No sale records on file
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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