17 Masons Yard, Islington, London, EC1V 8DX

17 Masons Yard is a one-bedroom end-of-terrace house in Islington, London, London (EC1V 8DX). It has a recorded floor area of 79 m² (around 850 sq ft), construction records dating it to 1983-1990 and council tax band F. The latest certificate (May 2021) shows a D (score 66), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since March 2011. Between certificates, roof efficiency dropped from Good to Average and lighting dropped from Very Good to Good. Main heating runs on electricity. At 79 m² this is the 18th smallest of 23 units on EPC record in the building, where floor areas span 44–111 m². The building's EPC ratings span E to B across 23 units on file. Other recorded features include a balcony and a basement. Period features are noted in the property record.

Held since August 2001 — that's 25 years off the open market, well above the local norm. Today's modelled estimate of £671,000 sits 148.5% above the 2001 sale of £270,000. On a £-per-square-foot basis, the last sale (£318/sq ft) was about 18.1% below the postcode norm. At 79 m² it's 29.5% larger than the typical home in the postcode (61 m² median across 22 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 86% of similar EPCs).