21 Derwen Fawr, Llandybie, Ammanford, SA18 2UY

21 Derwen Fawr is a detached house in Llandybie, Ammanford, Ammanford (SA18 2UY). It has a recorded floor area of 112 m² (around 1206 sq ft), construction records dating it to 1976-1982 and council tax band D. The latest certificate (March 2014) shows a D (score 62), on the cusp of jumping into the C band. When first surveyed in November 2009 the rating was E, the property has climbed 1 band since. Between certificates, window efficiency went from Poor to Average, hot-water efficiency went from Poor to Good and lighting went from Very Poor to Average; while wall efficiency dropped from Good to Average. The recommended improvements would lift it to B (score 84), a 2-band jump. The latest certificate is from March 2014, so improvements made since then won't be reflected.

It hasn't traded since September 2010, a hold of 16 years that's notably long for the area. At 112 m² the property is well over the postcode median (81 m² across 17 EPCs), placing it in the larger end of the local stock. Today's modelled estimate of £240,000 sits 92% above the 2010 sale of £124,999. On a £-per-square-foot basis, the last sale (£104/sq ft) was about 34.7% below the postcode norm.