31a, Moreton Terrace, Westminster, London, SW1V 2NS

31a is a mid-terrace house in Westminster, London, London (SW1V 2NS). 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. The latest certificate (April 2019) shows a D (score 68), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since December 2008. Between certificates, window efficiency went from Very Poor to Poor, hot-water efficiency went from Average to Good and lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 78). At 53 m² this is the 5th smallest of 23 units on EPC record in the building, where floor areas span 33–233 m². The building's EPC ratings span E to C across 23 units on file.

Held since October 1995 — that's 31 years off the open market, well above the local norm. 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 £688,000 sits 568% above the 1995 sale of £103,000. On a £-per-square-foot basis, the last sale (£181/sq ft) was about 68.4% below the postcode norm. At 53 m² it's 23.7% smaller than the typical home in the postcode (70 m² median across 32 EPCs).