Washington House, Flat 12, Basil Street, Kensington And Chelsea, London, SW3 1AR

Washington House is a mid-terrace house in Kensington And Chelsea, London, London (SW3 1AR). It has a recorded floor area of 215 m² (around 2314 sq ft), construction records dating it to 1900-1929 and council tax band H. At 215 m² this is the largest unit on EPC record across Washington House (145–215 m²). The building's EPC ratings span E to B, with this unit at the bottom. On EPC score it ranks last in the building (39 versus a best of 82). The latest certificate (May 2024) shows an E (score 39), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since January 2013. Between certificates, window efficiency went from Very Poor to Average; while hot-water efficiency dropped from Good to Average. The recommended improvements would push it to D (score 63).

Sale prices here have lagged London HPI: -2.7% per year against 0% for the wider region. Today's modelled estimate of £4,378,000 is 23.2% below the 2024 sale of £5,700,000, below the original sale price, which typically signals condition or completion-status changes worth verifying. On a £-per-square-foot basis, the last sale (£2,463/sq ft) was about 422.9% above the typical sold price in the postcode. At 215 m² the property is well over the postcode median (160 m² across 7 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. One planning record on file: an extension approved in 2025. Past consents include an extension, meaningful when judging how the property has evolved. Most recent transfer: September 2024 at £5,700,000.