21 Northstand Apartments, Highbury Stadium Square, Islington, London, N5 1FJ

21 Northstand Apartments is a one-bedroom mid-terrace house in Islington, London, London (N5 1FJ). It has a recorded floor area of 56 m² (around 603 sq ft), construction records dating it to 2007 onwards and council tax band D. At 56 m² this is the 18th smallest of 71 units on EPC record in the building, where floor areas span 41–100 m². The building's EPC ratings span C to B, with this unit at the bottom. Period features are noted in the property record. The latest certificate (November 2018) shows a C (score 80), near the top of the C band. Earlier certificates rated it B (October 2008); the latest reading is one band lower. Between certificates, wall efficiency went from Good to Very Good and lighting went from Good to Very Good; while window efficiency dropped from Good to Very Poor. The recommended improvements would push it to B (score 82).

It hasn't traded since March 2011, a hold of 15 years that's notably long for the area. Today's modelled estimate of £435,000 sits 50% above the 2011 sale of £290,000. On a £-per-square-foot basis, the last sale (£481/sq ft) was about 30.3% below the postcode norm. At 56 m² it's 19.4% smaller than the typical home in the postcode (70 m² median across 70 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 77% of similar EPCs).