13a, St Johns Road, Isleworth, TW7 6NB

13a is a two-bedroom mid-terrace house in Isleworth (TW7 6NB). It has a recorded floor area of 49 m² (around 527 sq ft), construction records dating it to 1900-1929 and council tax band B. The latest certificate (July 2020) shows a D (score 59), a step below the typical UK home. Earlier certificates rated it C (January 2010); the latest reading is one band lower. Between certificates, lighting went from Average to Very Good; while roof efficiency dropped from Average to Very Poor and window efficiency dropped from Good to Average. At 49 m² this is the 14th smallest of 22 units on EPC record in the building, where floor areas span 20–114 m². The building's EPC ratings span F to C across 22 units on file. Other recorded features include a loft.

Held since June 1997 — that's 29 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. Today's modelled estimate of £342,000 sits 288.6% above the 1997 sale of £88,000. On a £-per-square-foot basis, the last sale (£167/sq ft) was about 58.2% below the postcode norm.