Hallam Rock, Flat 34, 100 Norwood Road, Sheffield, S5 7BE

Hallam Rock is a one-bedroom detached house in Sheffield (S5 7BE). It has a recorded floor area of 46 m² (around 495 sq ft) and construction records dating it to 1950-1966. At 46 m² this is the 6th smallest of 20 units on EPC record in Hallam Rock, where floor areas span 32–48 m². The building's EPC ratings span E to C, with this unit at the bottom. The latest certificate (June 2016) shows an E (score 48), well below the UK norm with real room to improve. Earlier certificates rated it D (February 2015); the latest reading is one band lower. Between certificates, lighting went from Poor to Very Good; while wall efficiency dropped from Average to Poor and roof efficiency dropped from Poor to Very Poor. The recommended improvements would lift it to C (score 75), a 2-band jump.

On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £106,000 sits 140.9% above the 2017 sale of £44,000. On a £-per-square-foot basis, the last sale (£89/sq ft) was about 20.2% below the postcode norm. Last sold in February 2017, so it's been off the market for around 9 years.