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

27 Gisbey House is a one-bedroom semi-detached house in Isleworth (TW7 6GH). It has a recorded floor area of 49 m² (around 527 sq ft), construction records dating it to 2007 onwards and council tax band C. The latest certificate (March 2020) shows a C (score 77), near the top of the C band. Earlier certificates rated it B (March 2010); the latest reading is one band lower. Between certificates, wall efficiency dropped from Very Good to Good and lighting dropped from Very Good to Average. At 49 m² this is the 2nd 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 across 27 units on file.

Today's modelled estimate of £266,000 is 12.1% below the 2016 sale of £302,500, below the original sale price, which typically signals condition or completion-status changes worth verifying. On a £-per-square-foot basis, the last sale (£574/sq ft) was about 62.6% above the typical sold price in the postcode. Last sold in September 2016, so it's been off the market for around 10 years. At 49 m² it's 20.3% smaller than the typical home in the postcode (62 m² median across 26 EPCs).