21a, Balfour Road, Islington, London, N5 2HB

21a is a mid-terrace house in Islington, London, London (N5 2HB). It has a recorded floor area of 50 m² (around 538 sq ft) and construction records dating it to 1900-1929. At 50 m² this is the 3rd smallest of 24 units on EPC record in the building, where floor areas span 33–250 m². The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (39 versus a best of 73). The latest certificate (April 2025) shows an E (score 39), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 79), a 2-band jump. Main heating runs on to be used only when there is no heating/hot.

It hasn't traded since April 2002, a hold of 24 years that's notably long for the area. Today's modelled estimate of £581,000 sits 263.1% above the 2002 sale of £160,000. On a £-per-square-foot basis, the last sale (£297/sq ft) was about 40.6% below the postcode norm. At 50 m² it sits well below the postcode median (90 m² across 40 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 85% of similar EPCs).