1a, Rock Street, Islington, London, N4 2DN

1a is a two-bedroom semi-detached house in Islington, London, London (N4 2DN). It has a recorded floor area of 54 m² (around 581 sq ft) and construction records dating it to 1900-1929. The latest certificate (March 2022) shows a D (score 66), on the cusp of jumping into the C band. When first surveyed in November 2011 the rating was E, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Poor and roof efficiency went from Very Poor to Good. The recommended improvements would push it to C (score 78). At 54 m² this is the 7th smallest of 18 units on EPC record in the building, where floor areas span 21–152 m². The building's EPC ratings span D to B, with this unit at the bottom.

At 54 m² the property is well over the postcode median (28 m² across 66 EPCs), placing it in the larger end of the local stock. Across 2002–2013, sale prices on this property compounded at 4.4% per year. Today's modelled estimate of £410,000 sits 105% above the 2013 sale of £200,000. On a £-per-square-foot basis, the last sale (£344/sq ft) was about 28.3% below the postcode norm. 13 years since the last transfer (March 2013).