7 Blackwell Hill, Northampton, NN4 9YB

7 Blackwell Hill is a three-bedroom detached house in Northampton (NN4 9YB). It has a recorded floor area of 74 m² (around 797 sq ft), construction records dating it to 1983-1990 and council tax band C. The latest certificate (November 2013) shows an E (score 51), well below the UK norm with real room to improve. Earlier certificates rated it D (May 2009); the latest reading is one band lower. Between certificates, window efficiency went from Average to Good, lighting went from Very Poor to Average and main heating went from Average to Good; while roof efficiency dropped from Average to Very Poor. The recommended improvements would lift it to B (score 85), a 3-band jump. The latest certificate is from November 2013, so improvements made since then won't be reflected.

It hasn't traded since April 1998, a hold of 28 years that's notably long for the area. 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 £281,000 sits 319.4% above the 1998 sale of £67,000. On a £-per-square-foot basis, the last sale (£84/sq ft) was about 49.2% below the postcode norm. At 74 m² it's 19.5% smaller than the typical home in the postcode (92 m² median across 24 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 88% of similar EPCs).