Flat 23a, 480 London Road, Isleworth, TW7 4RL

Flat 23a is an end-of-terrace house in Isleworth (TW7 4RL). It has a recorded floor area of 53 m² (around 570 sq ft) and construction records dating it to 1996-2002. The latest certificate (April 2021) shows a D (score 64), on the cusp of jumping into the C band. When first surveyed in April 2010 the rating was E, the property has climbed 1 band since. Between certificates, lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 80). Main heating runs on electricity. At 53 m² this is the 2nd smallest of 18 units on EPC record in the building, where floor areas span 50–121 m². The building's EPC ratings span D to B, with this unit at the bottom. On EPC score it ranks last in the building (64 versus a best of 84).

At 53 m² it's 15.9% smaller than the typical home in the postcode (63 m² median across 17 EPCs). On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2007–2017, sale prices on this property compounded at 3% per year. On a £-per-square-foot basis, the last sale (£517/sq ft) was about 63% above the typical sold price in the postcode. 9 years since the last transfer (June 2017).