25a, Stonefield Street, Islington, London, N1 0HW

25a is a one-bedroom end-of-terrace house in Islington, London, London (N1 0HW). It has a recorded floor area of 38 m² (around 409 sq ft) and construction records dating it to 1900-1929. At 38 m² this is the 3rd smallest of 8 units on EPC record in the building, where floor areas span 30–180 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 (46 versus a best of 74). The latest certificate (August 2018) shows an E (score 46), 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 electricity.

Held since April 2007 — that's 19 years off the open market, well above the local norm. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. Sale prices here have outpaced London HPI: 11.9% per year against 0% for the wider region. On a £-per-square-foot basis, the last sale (£3,411/sq ft) was about 364.3% above the typical sold price in the postcode. At 38 m² it sits well below the postcode median (76 m² across 11 EPCs), making it one of the more compact homes locally. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement.