Flat 3, 17 Burnell Road, Sutton, SM1 4EE

Flat 3 is a one-bedroom semi-detached house in Sutton (SM1 4EE). It has a recorded floor area of 37 m² (around 398 sq ft), construction records dating it to 1983-1990 and council tax band C. Tenure is freehold. At 37 m² this is the smallest unit on EPC record across the building (37–56 m²). The building's EPC ratings span E to C, with this unit at the bottom. The latest certificate (May 2018) shows an E (score 47), well below the UK norm with real room to improve. The rating has held steady at E across 3 certificates since October 2008. Between certificates, wall efficiency went from Poor to Good; while window efficiency dropped from Good to Average and main heating dropped from Average to Very Poor. The recommended improvements would lift it to C (score 77), a 2-band jump. Main heating runs on to be used only when there is no heating/hot.

It hasn't traded since September 1997, a hold of 29 years that's notably long for the area. 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 £208,000 sits 395.2% above the 1997 sale of £42,000. On a £-per-square-foot basis, the last sale (£105/sq ft) was about 57.4% below the postcode norm. At 37 m² it's 21.3% smaller than the typical home in the postcode (47 m² median across 34 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 74% of similar EPCs).