51a, Flat 5, St Giles Street, Norwich, NR2 1JR

51a is a semi-detached house in Norwich (NR2 1JR). It has a recorded floor area of 42 m² (around 452 sq ft) and construction records dating it to before 1900. At 42 m² this is the 3rd smallest of 7 units on EPC record in 51a, where floor areas span 35–60 m². The building's EPC ratings span E to B, with this unit at the bottom. On EPC score it ranks last in the building (49 versus a best of 86). The latest certificate (May 2020) shows an E (score 49), well below the UK norm with real room to improve. Earlier certificates rated it B (October 2008); the latest reading is 3 bands lower. Between certificates, roof efficiency went from Good to Very Good and lighting went from Poor to Very Good; while wall efficiency dropped from Good to Very Poor and window efficiency dropped from Average to Poor. The recommended improvements would push it to D (score 67). Main heating runs on electricity.

At 42 m² it sits well below the postcode median (60 m² across 13 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 85% of similar EPCs).