309a, High Road Leytonstone, London, E11 4JT

309a is a two-bedroom mid-terrace house in London (E11 4JT). It has a recorded floor area of 55 m² (around 592 sq ft) and construction records dating it to 1900-1929. At 55 m² this is the 11th smallest of 13 units on EPC record in the building, where floor areas span 29–77 m². The building's EPC ratings span E to C, with this unit at the bottom. The latest certificate (November 2025) shows an E (score 40), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since December 2013. Between certificates, roof efficiency went from Very Poor to Average; while window efficiency dropped from Good to Average and hot-water efficiency dropped from Average to Poor. The recommended improvements would lift it to C (score 70), a 2-band jump. Main heating runs on electricity. This certificate was lodged in the last six months, so the rating reflects current condition.

At 55 m² it's 17% larger than the typical home in the postcode (47 m² median across 53 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 83% of similar EPCs).