15a, Gillespie Road, Islington, London, N5 1LH

15a is a three-bedroom mid-terrace house in Islington, London, London (N5 1LH). It has a recorded floor area of 42 m² (around 452 sq ft), construction records dating it to before 1900 and council tax band C. At 42 m² this is the smallest unit on EPC record across the building (42–166 m²). The building's EPC ratings span E to C, with this unit at the top. Other recorded features include a conservatory. The latest certificate (June 2018) shows a C (score 72). The rating has held steady at C across 2 certificates since October 2008. Between certificates, window efficiency went from Very Poor to Poor and lighting went from Very Poor to Poor.

Held since November 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. At 42 m² it sits well below the postcode median (102 m² across 31 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 84% of similar EPCs). Across 1999–2007, sale prices on this property compounded at 8.6% per year. Today's modelled estimate of £805,000 is 27% above the 2007 sale price. On a £-per-square-foot basis, the last sale (£1,402/sq ft) was about 198.4% above the typical sold price in the postcode.