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

15 St Stephens Mansions is a two-bedroom end-of-terrace house in Cardiff (CF10 5LQ). It has a recorded floor area of 53 m² (around 570 sq ft), construction records dating it to 1996-2002 and council tax band E. The latest certificate (January 2024) shows a D (score 60), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since April 2009. Between certificates, hot-water efficiency went from Very Poor to Poor and lighting went from Very Poor to Very Good; while window efficiency dropped from Good to Average. The recommended improvements would push it to C (score 72). Main heating runs on electricity. At 53 m² this is the 4th 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 across 64 units on file.

Last sold in December 2014, so it's been off the market for around 12 years. Across the public record there are 4 sales, relatively high churn for a single property. At 53 m² it's 27.4% smaller than the typical home in the postcode (73 m² median across 63 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 86% of similar EPCs). Today's modelled estimate of £173,000 is 10.2% above the 2014 sale price. On a £-per-square-foot basis, the last sale (£275/sq ft) was about 33.5% above the typical sold price in the postcode.