5a, Colney Drive, Norwich, NR4 7RH

5a is a detached house in Norwich (NR4 7RH). It has a recorded floor area of 42 m² (around 452 sq ft), construction records dating it to 1967-1975 and council tax band A. At 42 m² this is the smallest unit on EPC record across the building (42–322 m²). The building's EPC ratings span F to B, with this unit at the bottom. On EPC score it ranks last in the building (33 versus a best of 86). The latest certificate (May 2014) shows an F (score 33), near the bottom of the EPC scale. Earlier certificates rated it D (April 2012); the latest reading is 2 bands lower. Between certificates, roof efficiency dropped from Good to Poor and window efficiency dropped from Poor to Very Poor. The recommended improvements would lift it to C (score 75), a 3-band jump. The latest certificate is from May 2014, so improvements made since then won't be reflected.

At 42 m² it sits well below the postcode median (205 m² across 5 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 80% of similar EPCs).