Bottom Flat, 27 Birchfield Road, Northampton, NN1 4RF

Bottom Flat is a mid-terrace house in Northampton (NN1 4RF). It has a recorded floor area of 124 m² (around 1335 sq ft) and construction records dating it to before 1900. The latest certificate (July 2014) shows a D (score 55), a step below the typical UK home. When first surveyed in May 2014 the rating was E, the property has climbed 1 band since. Between certificates, roof efficiency dropped from Good to Very Poor. The recommended improvements would push it to C (score 77). The latest certificate is from July 2014, so improvements made since then won't be reflected.

Held since June 1995 — that's 31 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 £274,000 sits 360.5% above the 1995 sale of £59,500. On a £-per-square-foot basis, the last sale (£45/sq ft) was about 67.2% below the postcode norm.