Flat 1, 51 Semilong Road, Northampton, NN2 6BT

Flat 1 is a one-bedroom mid-terrace house in Northampton (NN2 6BT). It has a recorded floor area of 41 m² (around 441 sq ft), construction records dating it to 1900-1929 and council tax band A. At 41 m² this is the 2nd smallest of 3 units on EPC record in the building, where floor areas span 40–80 m². The building's EPC ratings span E to D, with this unit at the top. The latest certificate (September 2019) shows a D (score 65), on the cusp of jumping into the C band. When first surveyed in July 2009 the rating was E, the property has climbed 1 band since. Between certificates, lighting went from Very Poor to Very Good and main heating went from Very Poor to Average. The recommended improvements would lift it to B (score 82), a 2-band jump. Main heating runs on electricity.

Held since April 2000 — that's 26 years off the open market, well above the local norm. Across 1998–2000, sale prices on this property compounded at 81.6% per year. Today's modelled estimate of £110,000 sits 253.1% above the 2000 sale of £31,150. On a £-per-square-foot basis, the last sale (£71/sq ft) was about 44.6% below the postcode norm.