Flat 6, 46 Derngate, Northampton, NN1 1HS

Flat 6 is a two-bedroom mid-terrace house in Northampton (NN1 1HS). It has a recorded floor area of 56 m² (around 603 sq ft), construction records dating it to 1996-2002 and council tax band C. At 56 m² this is the 5th smallest of 6 units on EPC record in the building, where floor areas span 45–56 m². The building's EPC ratings span D to B, with this unit at the bottom. On EPC score it ranks last in the building (67 versus a best of 84). The latest certificate (November 2018) shows a D (score 67), on the cusp of jumping into the C band. Earlier certificates rated it C (November 2008); the latest reading is one band lower. Between certificates, hot-water efficiency went from Poor to Average and main heating went from Poor to Average. The recommended improvements would push it to C (score 76). Main heating runs on electricity.

Untraded for 26 years, with the last transfer in June 2000. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £176,000 sits 102.4% above the 2000 sale of £86,950. On a £-per-square-foot basis, the last sale (£144/sq ft) was about 41.3% below the postcode norm.