18 St Stephens Mansions, Mount Stuart Square, Cardiff, CF10 5LQ

18 St Stephens Mansions is a mid-terrace house in Cardiff (CF10 5LQ). It has a recorded floor area of 62 m² (around 667 sq ft), construction records dating it to 1996-2002 and council tax band E. The latest certificate (May 2023) returns a B (score 82), comfortably above the UK average. When first surveyed in May 2013 the rating was C, the property has climbed 1 band since. Between certificates, lighting went from Good to Very Good; while window efficiency dropped from Good to Average and hot-water efficiency dropped from Average to Poor. Main heating runs on electricity. At 62 m² this is the 17th smallest of 64 units on EPC record in the building, where floor areas span 48–99 m². The building's EPC ratings span E to B, with this unit at the top.

10 years since the last transfer (March 2016). Across the public record there are 6 sales, relatively high churn for a single property. At 62 m² it's 15.1% smaller than the typical home in the postcode (73 m² median across 63 EPCs). Its energy rating outperforms most of the postcode (better than 79% of similar EPCs). Across 2003–2016, sale prices on this property compounded at 1.4% per year. On a £-per-square-foot basis, the last sale (£255/sq ft) was about 23.7% above the typical sold price in the postcode.