255a, First Floor Flat, Chiswick High Road, London, W4 4PU

255a is an end-of-terrace house in London (W4 4PU). It has a recorded floor area of 55 m² (around 592 sq ft) and construction records dating it to before 1900. At 55 m² this is the smallest unit on EPC record across 255a (55–62 m²). The building's EPC ratings span F to D, with this unit at the top. On EPC score it ranks first in the building (61 versus a worst of 36). The latest certificate (May 2021) shows a D (score 61), on the cusp of jumping into the C band. The rating has held steady at D across 6 certificates since January 2009. The recommended improvements would push it to C (score 74).

Across 1996–2021, sale prices on this property compounded at -11.6% per year. Today's modelled estimate of £737,000 sits 4654.8% above the 2021 sale of £15,500. On a £-per-square-foot basis, the last sale (£26/sq ft) was about 95.1% below the postcode norm. At 55 m² it's 25% larger than the typical home in the postcode (44 m² median across 15 EPCs). Last sale on file: £15,500 in September 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.