6 St James Mansions, Mount Stuart Square, Cardiff, CF10 5LG

6 St James Mansions is a one-bedroom semi-detached house in Cardiff (CF10 5LG). It has a recorded floor area of 43 m² (around 463 sq ft), construction records dating it to 1996-2002 and council tax band D. At 43 m² this is the smallest unit on EPC record across 6 St James Mansions (43–86 m²). The building's EPC ratings span D to C, with this unit at the bottom. On EPC score it ranks last in the building (62 versus a best of 77). The latest certificate (April 2019) shows a D (score 62), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since March 2009. Between certificates, lighting went from Very Poor to Very Good; while hot-water efficiency dropped from Average to Very Poor. The recommended improvements would push it to C (score 79). Main heating runs on electricity.

Untraded for 24 years, with the last transfer in June 2002. Today's modelled estimate of £135,000 sits 62.7% above the 2002 sale of £83,000. At 43 m² it's 27.1% smaller than the typical home in the postcode (59 m² median across 23 EPCs).