1 5 The Light Box, Duke Street, Northampton, NN1 3BA

1 5 The Light Box is a mid-terrace house in Northampton (NN1 3BA). It has a recorded floor area of 99 m² (around 1066 sq ft), construction records dating it to 1996-2002 and council tax band D. At 99 m² this is the largest unit on EPC record across the building (72–99 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 (64 versus a best of 69). The latest certificate (September 2023) shows a D (score 64), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since July 2010. Between certificates, window efficiency went from Average to Good and lighting went from Very Poor to Very Good; while hot-water efficiency dropped from Average to Very Poor and main heating dropped from Poor to Very Poor. Main heating runs on electricity.

Untraded for 23 years, with the last transfer in June 2003. At 99 m² the property is well over the postcode median (70 m² across 35 EPCs), placing it in the larger end of the local stock. Across 2002–2003, sale prices on this property compounded at 78.6% per year. Today's modelled estimate of £172,000 is 37.6% above the 2003 sale price. On a £-per-square-foot basis, the last sale (£117/sq ft) was about 37.5% below the postcode norm.