12b, Mill Road, Ely, Cardiff, CF5 4AG

12b is a one-bedroom end-of-terrace house in Ely, Cardiff, Cardiff (CF5 4AG). It has a recorded floor area of 41 m² (around 441 sq ft), construction records dating it to before 1900 and council tax band A. At 41 m² this is the 8th smallest of 24 units on EPC record in the building, where floor areas span 33–140 m². The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (44 versus a best of 73). The latest certificate (September 2017) shows an E (score 44), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 79), a 2-band jump. Main heating runs on electricity.

Across 2003–2018, sale prices on this property compounded at 4.2% per year. Today's modelled estimate of £109,000 sits 67.7% above the 2018 sale of £65,000. On a £-per-square-foot basis, the last sale (£147/sq ft) was about 21.9% above the typical sold price in the postcode. At 41 m² it sits well below the postcode median (78 m² across 23 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 83% of similar EPCs). 1 bedrooms is on the smaller side for this postcode, where 3 is the typical count. On the market in February 2018 and unlisted since — roughly 8 years. Across the public record there are 5 sales, relatively high churn for a single property.