255a, Flat, Chiswick High Road, Hounslow, London, W4 4PU

255a is an end-of-terrace house in Hounslow, London, London (W4 4PU). It has a recorded floor area of 58 m² (around 628 sq ft), construction records dating it to before 1900 and council tax band D. The latest certificate (December 2008) shows an F (score 36), near the bottom of the EPC scale. Earlier certificates rated it C (December 2008); the latest reading is 3 bands lower. Between certificates, hot-water efficiency dropped from Good to Poor and main heating dropped from Good to Average. The recommended improvements would push it to E (score 53). The latest certificate is from December 2008, so improvements made since then won't be reflected. At 58 m² this is the 2nd smallest of 3 units on EPC record in 255a, where floor areas span 55–62 m². The building's EPC ratings span F to D, with this unit at the bottom. On EPC score it ranks last in the building (36 versus a best of 61).

Held since May 1996 — that's 30 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. At 58 m² the property is well over the postcode median (44 m² across 15 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £758,000 sits 116.6% above the 1996 sale of £350,000. One historical planning record sits against the property in 2003.