13 Gisbey House, Union Lane, Isleworth, TW7 6GH

13 Gisbey House is a two-bedroom mid-terrace house in Isleworth (TW7 6GH). It has a recorded floor area of 66 m² (around 710 sq ft), construction records dating it to 2007-2011 and council tax band D. At 66 m² this is the 22nd smallest of 27 units on EPC record in the building, where floor areas span 48–68 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 (65 versus a best of 87). The latest certificate (December 2021) shows a D (score 65), on the cusp of jumping into the C band. Earlier certificates rated it B (March 2010); the latest reading is 2 bands lower. Between certificates, wall efficiency dropped from Very Good to Good and hot-water efficiency dropped from Good to Very Poor. Main heating runs on electricity.

At 66 m² it's 20.8% larger than the typical home in the postcode (55 m² median across 26 EPCs). On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2010–2015, sale prices on this property compounded at 8% per year. On a £-per-square-foot basis, the last sale (£493/sq ft) was about 39% above the typical sold price in the postcode. Last changed hands 11 years ago, in September 2015.