Derlwyn Mansion, Alltwalis Road, Alltwalis, Carmarthen, SA32 7DZ

Derlwyn Mansion is a detached house in Alltwalis, Carmarthen, Carmarthen (SA32 7DZ). It has a recorded floor area of 371 m² (around 3993 sq ft), construction records dating it to before 1900 and council tax band H. The latest certificate (July 2022) shows a D (score 59), a step below the typical UK home. When first surveyed in October 2008 the rating was F, the property has climbed 2 bands since. Between certificates, wall efficiency went from Very Poor to Good, window efficiency went from Average to Good and lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 80). Main heating runs on oil.

At 371 m² the property is well over the postcode median (127 m² across 17 EPCs), placing it in the larger end of the local stock. Its energy rating outperforms most of the postcode (better than 76% of similar EPCs). Today's modelled estimate of £841,000 sits 107.7% above the 2012 sale of £405,000. On a £-per-square-foot basis, the last sale (£101/sq ft) was about 31.3% below the postcode norm. On the market in February 2012 and unlisted since — roughly 14 years.