Flat 1, 20 Warwick Square Mews, London, SW1V 2EL

Flat 1 is a one-bedroom end-of-terrace house in London (SW1V 2EL). It has a recorded floor area of 53 m² (around 570 sq ft), construction records dating it to before 1900 and council tax band E. At 53 m² this is the largest unit on EPC record across the building (44–53 m²). The building's EPC ratings span E to C across 3 units on file. Other recorded features include a balcony. The latest certificate (June 2019) shows a D (score 65), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since May 2009. Between certificates, hot-water efficiency went from Average to Very Good and lighting went from Very Poor to Average; while window efficiency dropped from Average to Very Poor. The recommended improvements would push it to C (score 76).

Untraded for 31 years, with the last transfer in June 1995. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £626,000 sits 421.7% above the 1995 sale of £120,000. On a £-per-square-foot basis, the last sale (£210/sq ft) was about 65% below the postcode norm. At 53 m² it's 24.3% smaller than the typical home in the postcode (70 m² median across 13 EPCs).