1b, Haroldstone Road, London, E17 7AN

1b is an end-of-terrace house in London (E17 7AN). It has a recorded floor area of 48 m² (around 518 sq ft) and construction records dating it to 1900-1929. The latest certificate (June 2011) shows an E (score 53), well below the UK norm with real room to improve. When first surveyed in April 2010 the rating was G, the property has climbed 2 bands since. Between certificates, window efficiency went from Very Poor to Good, hot-water efficiency went from Average to Good and main heating went from Very Poor to Good; while roof efficiency dropped from Poor to Very Poor. The recommended improvements would push it to D (score 59). The latest certificate is from June 2011, so improvements made since then won't be reflected. At 48 m² this is the 3rd smallest of 4 units on EPC record in the building, where floor areas span 47–59 m². The building's EPC ratings span E to D, with this unit at the bottom. On EPC score it ranks last in the building (53 versus a best of 67).

At 48 m² it's 24.5% smaller than the typical home in the postcode (64 m² median across 22 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 82% of similar EPCs).