12b, Cromarty Close, Sinfin, Derby, DE24 9NB

12b is a semi-detached house in Sinfin, Derby, Derby (DE24 9NB). It has a recorded floor area of 64 m² (around 689 sq ft) and construction records dating it to 1950-1966. The latest certificate (January 2014) shows a D (score 64), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since January 2014. Between certificates, roof efficiency went from Poor to Average and lighting went from Very Poor to Very Good; while wall efficiency dropped from Average to Poor. The recommended improvements would push it to C (score 73). The latest certificate is from January 2014, so improvements made since then won't be reflected. At 64 m² this is the 2nd smallest of 24 units on EPC record in the building, where floor areas span 51–99 m². The building's EPC ratings span E to C across 24 units on file.

At 64 m² it's 25.9% smaller than the typical home in the postcode (86 m² median across 23 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 78% of similar EPCs). One historical planning record sits against the property in 2024.