11a, Cockfosters Parade, Cockfosters Road, Barnet, EN4 0BX

11a is a mid-terrace house in Barnet (EN4 0BX). It has a recorded floor area of 19 m² (around 205 sq ft), construction records dating it to before 1900 and council tax band C. At 19 m² this is the smallest unit on EPC record across the building (19–92 m²). The building's EPC ratings span E to C, with this unit at the bottom. The latest certificate (April 2020) shows an E (score 53), well below the UK norm with real room to improve. Earlier certificates rated it D (November 2009); the latest reading is one band lower. Between certificates, wall efficiency went from Very Poor to Poor and lighting went from Very Poor to Very Good; while hot-water efficiency dropped from Very Good to Poor and main heating dropped from Very Good to Very Poor. The recommended improvements would lift it to C (score 75), a 2-band jump. Main heating runs on electricity.

Held since February 2002 — that's 24 years off the open market, well above the local norm. Today's modelled estimate of £474,000 sits 97.5% above the 2002 sale of £240,000. At 19 m² it sits well below the postcode median (81 m² across 9 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 78% of similar EPCs).