21a, Denning Road, Camden, London, NW3 1ST

21a is a mid-terrace house in Camden, London, London (NW3 1ST). It has a recorded floor area of 43 m² (around 463 sq ft) and construction records dating it to 1900-1929. At 43 m² this is the 3rd smallest of 31 units on EPC record in the building, where floor areas span 33–374 m². The building's EPC ratings span E to C, with this unit at the bottom. The latest certificate (November 2018) shows an E (score 45), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since October 2008. Between certificates, window efficiency went from Poor to Average and lighting went from Very Poor to Good; while main heating dropped from Average to Very Poor. The recommended improvements would lift it to C (score 75), a 2-band jump. Main heating runs on to be used only when there is no heating/hot.

Held since July 2004 — that's 22 years off the open market, well above the local norm. Today's modelled estimate of £426,000 sits 373.3% above the 2004 sale of £90,000. On a £-per-square-foot basis, the last sale (£194/sq ft) was about 74.6% below the postcode norm. At 43 m² it sits well below the postcode median (70 m² across 59 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 83% of similar EPCs).