Flat 3, 35 Colwyn Road, Northampton, NN1 3PZ

Flat 3 is a two-bedroom mid-terrace house in Northampton (NN1 3PZ). It has a recorded floor area of 74 m² (around 797 sq ft), construction records dating it to before 1900 and council tax band A. At 74 m² this is the largest unit on EPC record across the building (27–74 m²). The building's EPC ratings span D to C, with this unit at the bottom. On EPC score it ranks last in the building (59 versus a best of 70). The latest certificate (June 2016) shows a D (score 59), a step below the typical UK home. The recommended improvements would push it to C (score 73). The latest certificate is from June 2016, so improvements made since then won't be reflected.

Held since April 2007 — that's 19 years off the open market, well above the local norm. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. Across 2002–2007, sale prices on this property compounded at 5.8% per year. Today's modelled estimate of £147,000 sits 67% above the 2007 sale of £88,000. On a £-per-square-foot basis, the last sale (£110/sq ft) was about 16.3% below the postcode norm. At 74 m² it's 15.9% smaller than the typical home in the postcode (88 m² median across 53 EPCs).