1 Crystal Avenue, Cardiff, CF23 5QJ

1 Crystal Avenue is a four-bedroom detached house in Cardiff (CF23 5QJ). It has a recorded floor area of 176 m² (around 1894 sq ft), construction records dating it to 1950-1966 and council tax band G. The latest certificate (February 2014) shows an E (score 49), well below the UK norm with real room to improve. The recommended improvements would push it to D (score 68). The latest certificate is from February 2014, so improvements made since then won't be reflected.

Held since October 1998 — that's 28 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. At 176 m² the property is well over the postcode median (90 m² across 11 EPCs), placing it in the larger end of the local stock. It lags the bulk of the postcode on energy efficiency (less efficient than 82% of similar EPCs). Today's modelled estimate of £520,000 sits 534.1% above the 1998 sale of £82,000. On a £-per-square-foot basis, the last sale (£43/sq ft) was about 82.5% below the postcode norm.