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

25 St James Mansions is a one-bedroom mid-terrace house in Cardiff (CF10 5LG). It has a recorded floor area of 44 m² (around 476 sq ft), construction records dating it to 2003-2006 and council tax band D. At 44 m² this is the 9th 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. The latest certificate (February 2011) shows a D (score 67), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since November 2008. The recommended improvements would push it to C (score 80). Main heating runs on electricity. The latest certificate is from February 2011, so improvements made since then won't be reflected.

Held since June 2002 — that's 24 years off the open market, well above the local norm. Today's modelled estimate of £135,000 sits 53.4% above the 2002 sale of £88,000. At 44 m² it's 25% smaller than the typical home in the postcode (59 m² median across 23 EPCs).