13 Gwern Hafren, Severn Grove, Cardiff, CF11 9EY

13 Gwern Hafren is a two-bedroom semi-detached house in Cardiff (CF11 9EY). It has a recorded floor area of 88 m² (around 947 sq ft), construction records dating it to 2007 onwards and council tax band F. The latest certificate (March 2019) returns a B (score 81), comfortably above the UK average. The rating has held steady at B across 2 certificates since February 2009. Between certificates, wall efficiency dropped from Very Good to Good and window efficiency dropped from Very Good to Good. At 88 m² this is the 13th smallest of 15 units on EPC record in the building, where floor areas span 34–93 m². The building's EPC ratings span C to B, with this unit at the top.

It hasn't traded since July 2009, a hold of 17 years that's notably long for the area. That sale fell during the post-crash dip, which often skews comparisons against later neighbouring sales. At 88 m² the property is well over the postcode median (49 m² across 14 EPCs), placing it in the larger end of the local stock. Today's modelled estimate of £269,000 is 47% above the 2009 sale price. On a £-per-square-foot basis, the last sale (£193/sq ft) was about 37.2% below the postcode norm.