11 Crystal Avenue, Cardiff, CF23 5QJ

11 Crystal Avenue is a four-bedroom semi-detached house in Cardiff (CF23 5QJ). It has a recorded floor area of 57 m² (around 610 sq ft), construction records dating it to 1930-1949 and council tax band F. The latest certificate (February 2010) shows an E (score 52), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 70), a 2-band jump. The latest certificate is from February 2010, so improvements made since then won't be reflected.

Today's modelled estimate of £410,000 sits 64% above the 2011 sale of £250,000. On a £-per-square-foot basis, the last sale (£410/sq ft) was about 70.8% above the typical sold price in the postcode. At 57 m² it sits well below the postcode median (98 m² across 11 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 82% of similar EPCs). One planning record on file: an extension approved in 2019. Past consents include an extension and partial demolition, meaningful when judging how the property has evolved. On the market in October 2011 and unlisted since — roughly 15 years.