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

53 St Stephens Mansions is a two-bedroom detached house in Cardiff (CF10 5LQ). It has a recorded floor area of 99 m² (around 1066 sq ft), construction records dating it to 1996-2002 and council tax band F. At 99 m² this is the largest unit on EPC record across the building (48–99 m²). The building's EPC ratings span E to B across 64 units on file. The latest certificate (April 2019) shows a C (score 71). The rating has held steady at C across 3 certificates since October 2008. Between certificates, window efficiency went from Average to Good and lighting went from Very Poor to Very Good; while hot-water efficiency dropped from Average to Poor and main heating dropped from Average to Very Poor. Main heating runs on electricity.

At 99 m² the property is well over the postcode median (71 m² across 63 EPCs), placing it in the larger end of the local stock. A recent sale: £184,000 in July 2025. Across the public record there are 4 sales, relatively high churn for a single property. Across 2009–2025, sale prices on this property compounded at 1.5% per year. Today's modelled estimate of £210,000 is 14.1% above the 2025 sale price. On a £-per-square-foot basis, the last sale (£173/sq ft) was about 17.5% below the postcode norm.