421b, Bethnal Green Road, Tower Hamlets, London, E2 0AN

421b is a mid-terrace house in Tower Hamlets, London, London (E2 0AN). It has a recorded floor area of 53 m² (around 575 sq ft) and construction records dating it to 1900-1929. The latest certificate (June 2009) returns a B (score 82), comfortably above the UK average. The latest certificate is from June 2009, so improvements made since then won't be reflected. At 53 m² this is the 8th smallest of 18 units on EPC record in the building, where floor areas span 21–93 m². The building's EPC ratings span F to B, with this unit at the top. On EPC score it ranks first in the building (82 versus a worst of 38).

Held since March 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. On energy efficiency it sits in the top 10% of properties in this postcode. Today's modelled estimate of £417,000 sits 434.6% above the 1995 sale of £78,000. On a £-per-square-foot basis, the last sale (£136/sq ft) was about 73.7% below the postcode norm.