Grimthorpe House, Flat 59, Percival Street, Islington, London, EC1V 0BP

Grimthorpe House is a five-bedroom mid-terrace house in Islington, London, London (EC1V 0BP). It has a recorded floor area of 88 m² (around 947 sq ft), construction records dating it to 1950-1966 and council tax band D. The latest certificate (September 2019) shows a C (score 79), near the top of the C band. The rating has held steady at C across 2 certificates since July 2009. Between certificates, wall efficiency went from Very Poor to Poor and lighting went from Good to Very Good. The recommended improvements would push it to B (score 82). At 88 m² this is the 17th smallest of 19 units on EPC record in Grimthorpe House, where floor areas span 52–89 m². The building's EPC ratings span E to B across 19 units on file. Other recorded features include a balcony. Period features are noted in the property record.

Held since June 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 88 m² the property is well over the postcode median (65 m² across 18 EPCs), placing it in the larger end of the local stock. Today's modelled estimate of £580,000 sits 132% above the 2007 sale of £250,000. On a £-per-square-foot basis, the last sale (£264/sq ft) was about 35% below the postcode norm.