27a, Avonwick Road, Hounslow, TW3 4DX

27a is an end-of-terrace house in Hounslow (TW3 4DX). It has a recorded floor area of 46 m² (around 495 sq ft), construction records dating it to 1900-1929 and council tax band C. The latest certificate (September 2014) shows an F (score 27), near the bottom of the EPC scale. The rating has held steady at F across 2 certificates since September 2014. Between certificates, window efficiency went from Average to Good; while hot-water efficiency dropped from Poor to Very Poor. The recommended improvements would lift it to C (score 77), a 3-band jump. Main heating runs on electricity. The latest certificate is from September 2014, so improvements made since then won't be reflected. At 46 m² this is the 3rd smallest of 23 units on EPC record in the building, where floor areas span 40–172 m². The building's EPC ratings span F to C, with this unit at the bottom. On EPC score it ranks last in the building (27 versus a best of 78).

Held since June 1999 — that's 27 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 46 m² it sits well below the postcode median (101 m² across 22 EPCs), making it one of the more compact homes locally. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £278,000 sits 346.6% above the 1999 sale of £62,250. On a £-per-square-foot basis, the last sale (£126/sq ft) was about 55% below the postcode norm.