5a, Northbrook Road, London, N22 8YQ

5a is an end-of-terrace house in London (N22 8YQ). It has a recorded floor area of 39 m² (around 420 sq ft), construction records dating it to 1900-1929 and council tax band C. At 39 m² this is the smallest unit on EPC record across the building (39–87 m²). The building's EPC ratings span E to D, with this unit at the bottom. The latest certificate (August 2012) shows an E (score 52), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 71), a 2-band jump. The latest certificate is from August 2012, so improvements made since then won't be reflected.

Held since September 1996 — that's 30 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 £291,000 sits 438.9% above the 1996 sale of £54,000. On a £-per-square-foot basis, the last sale (£129/sq ft) was about 60% below the postcode norm. At 39 m² it sits well below the postcode median (81 m² across 28 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 82% of similar EPCs).