12 Garth Olwg, Gwaelod Y Garth, Cardiff, CF15 9HW

12 Garth Olwg is a semi-detached house in Gwaelod-Y-Garth, Cardiff, Cardiff (CF15 9HW). It has a recorded floor area of 63 m² (around 678 sq ft), construction records dating it to 1967-1975 and council tax band D. At 63 m² this is the smallest unit on EPC record across the building (63–157 m²). The building's EPC ratings span E to C, with this unit at the top. The latest certificate (June 2014) shows a C (score 69), just inside the C band. When first surveyed in November 2012 the rating was D, the property has climbed 1 band since. Between certificates, hot-water efficiency went from Average to Good; while wall efficiency dropped from Good to Poor and roof efficiency dropped from Good to Average. The latest certificate is from June 2014, so improvements made since then won't be reflected.

Untraded for 20 years, with the last transfer in February 2006. At 63 m² it's 25% smaller than the typical home in the postcode (84 m² median across 18 EPCs). Its energy rating outperforms most of the postcode (better than 89% of similar EPCs). Today's modelled estimate of £211,000 is 19.2% above the 2006 sale price. On a £-per-square-foot basis, the last sale (£261/sq ft) was about 29.8% above the typical sold price in the postcode.