1a, Flat 1, Billington Street, Northampton, NN1 4LH

1a is a detached house in Northampton (NN1 4LH). It has a recorded floor area of 63 m² (around 676 sq ft), construction records dating it to 1950-1966 and council tax band A. At 63 m² this is the largest unit on EPC record across the building (24–63 m²). The building's EPC ratings span G to D, with this unit at the bottom. On EPC score it ranks last in the building (19 versus a best of 65). The latest certificate (May 2009) shows a G (score 19), near the bottom of the EPC scale. The recommended improvements would lift it to E (score 46), a 2-band jump. Main heating runs on electricity. The latest certificate is from May 2009, so improvements made since then won't be reflected.

Untraded for 19 years, with the last transfer in August 2007. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 63 m² it's 29.5% larger than the typical home in the postcode (49 m² median across 16 EPCs). On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2007–2007, sale prices on this property compounded at 46.7% per year. Today's modelled estimate of £147,000 is 11.4% above the 2007 sale price.