23a, Keston Road, London, SE15 4JA

23a is a mid-terrace house in London (SE15 4JA). It has a recorded floor area of 102 m² (around 1098 sq ft), construction records dating it to 1900-1929 and council tax band B. At 102 m² this is the largest unit on EPC record across the building (47–102 m²). The building's EPC ratings span D to C, with this unit at the bottom. On EPC score it ranks last in the building (60 versus a best of 74). The latest certificate (October 2020) shows a D (score 60), on the cusp of jumping into the C band. The rating has held steady at D across 3 certificates since March 2009. Between certificates, window efficiency went from Poor to Average and lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 72).

Untraded for 23 years, with the last transfer in July 2003. Today's modelled estimate of £606,000 sits 175.5% above the 2003 sale of £220,000. On a £-per-square-foot basis, the last sale (£200/sq ft) was about 57.3% below the postcode norm. At 102 m² it's 25.2% larger than the typical home in the postcode (82 m² median across 18 EPCs).