30 Key Close, Tower Hamlets, London, E1 4HG

30 Key Close is a one-bedroom end-of-terrace house in Tower Hamlets, London, London (E1 4HG). It has a recorded floor area of 45 m² (around 484 sq ft), construction records dating it to 1950-1966 and council tax band B. At 45 m² this is the 7th smallest of 33 units on EPC record in the building, where floor areas span 30–112 m². The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (49 versus a best of 74). The latest certificate (December 2016) shows an E (score 49), well below the UK norm with real room to improve. Earlier certificates rated it D (October 2008); the latest reading is one band lower. Between certificates, window efficiency went from Poor to Average, hot-water efficiency went from Poor to Average and main heating went from Average to Good; while wall efficiency dropped from Good to Poor and roof efficiency dropped from Poor to Very Poor. The recommended improvements would lift it to C (score 77), a 2-band jump.

Held since September 2007 — that's 19 years off the open market, well above the local norm. Across the public record there are 4 sales, relatively high churn for a single property. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 45 m² it sits well below the postcode median (67 m² across 32 EPCs), making it one of the more compact homes locally. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. 1 bedrooms is on the smaller side for this postcode, where 3 is the typical count. Across 2000–2007, sale prices on this property compounded at 15.4% per year. Today's modelled estimate of £292,000 sits 53.7% above the 2007 sale of £190,000. On a £-per-square-foot basis, the last sale (£392/sq ft) was about 29.7% above the typical sold price in the postcode.