12 Hydrangea Close, Cardiff, CF23 7HT

12 Hydrangea Close is a three-bedroom detached house in Cardiff (CF23 7HT). It has a recorded floor area of 85 m² (around 915 sq ft), construction records dating it to 1967-1975 and council tax band E. The latest certificate (June 2016) shows a D (score 61), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since October 2009. Between certificates, window efficiency went from Average to Good, hot-water efficiency went from Average to Good and lighting went from Very Poor to Very Good; while wall efficiency dropped from Good to Poor. The recommended improvements would lift it to B (score 85), a 2-band jump. The latest certificate is from June 2016, so improvements made since then won't be reflected.

Held since March 1997 — that's 29 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. Today's modelled estimate of £297,000 sits 350% above the 1997 sale of £66,000. On a £-per-square-foot basis, the last sale (£72/sq ft) was about 54.7% below the postcode norm.