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

22 St James Mansions is an end-of-terrace house in Cardiff (CF10 5LG). It has a recorded floor area of 39 m² (around 420 sq ft), construction records dating it to 2003-2006 and council tax band D. At 39 m² this is the smallest unit on EPC record across the building (39–92 m²). The building's EPC ratings span D to B across 24 units on file. The latest certificate (June 2025) shows a C (score 72). The rating has held steady at C across 2 certificates since November 2008. Between certificates, lighting went from Very Poor to Very Good; while hot-water efficiency dropped from Average to Poor. The recommended improvements would push it to B (score 81). Main heating runs on electricity.

At 39 m² it sits well below the postcode median (59 m² across 23 EPCs), making it one of the more compact homes locally. Across 2002–2014, sale prices on this property compounded at 2.1% per year. Today's modelled estimate of £145,000 is 31.8% above the 2014 sale price. On a £-per-square-foot basis, the last sale (£262/sq ft) was about 40.8% above the typical sold price in the postcode. On the market in August 2014 and unlisted since — roughly 12 years.