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

23 St James Mansions is a two-bedroom semi-detached house in Cardiff (CF10 5LG). It has a recorded floor area of 65 m² (around 700 sq ft), construction records dating it to 1996-2002 and council tax band E. The latest certificate (March 2017) shows a D (score 62), on the cusp of jumping into the C band. When first surveyed in June 2010 the rating was E, the property has climbed 1 band since. Between certificates, lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 80). Main heating runs on electricity. At 65 m² this is the 15th smallest of 24 units on EPC record in the building, where floor areas span 39–92 m². The building's EPC ratings span D to B, with this unit at the bottom.

Untraded for 24 years, with the last transfer in November 2002. At 65 m² it's 20.4% larger than the typical home in the postcode (54 m² median across 23 EPCs). Across 2002–2002, sale prices on this property compounded at 9% per year. Today's modelled estimate of £194,000 is 33.8% above the 2002 sale price.