121a, Sheen Lane, Richmond Upon Thames, London, SW14 8AE

121a is a two-bedroom mid-terrace house in Richmond Upon Thames, London, London (SW14 8AE). It has a recorded floor area of 50 m² (around 538 sq ft) and construction records dating it to 1900-1929. The latest certificate (September 2012) shows a D (score 61), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since June 2011. Between certificates, roof efficiency went from Average to Good. The recommended improvements would push it to C (score 72). The latest certificate is from September 2012, so improvements made since then won't be reflected. At 50 m² this is the 6th smallest of 29 units on EPC record in the building, where floor areas span 17–161 m². The building's EPC ratings span F to B across 29 units on file.

It hasn't traded since September 2002, a hold of 24 years that's notably long for the area. Today's modelled estimate of £503,000 sits 64.9% above the 2002 sale of £305,000. At 50 m² it's 18% smaller than the typical home in the postcode (61 m² median across 35 EPCs).