3 Derby Mews, Derby Road, Northampton, NN1 4JR

3 Derby Mews is a two-bedroom end-of-terrace house in Northampton (NN1 4JR). It has a recorded floor area of 51 m² (around 549 sq ft), construction records dating it to 2003-2006 and council tax band B. At 51 m² this is the smallest unit on EPC record across the building (51–70 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 72). The property has solar panels on record, all of which lower running costs and tend to lift resale appeal. The latest certificate (May 2024) shows a D (score 59), a step below the typical UK home. Earlier certificates rated it C (May 2009); the latest reading is one band lower. Between certificates, lighting went from Average to Very Good; while roof efficiency dropped from Good to Average and window efficiency dropped from Good to Average. The recommended improvements would push it to C (score 72). Main heating runs on electricity.

Untraded for 20 years, with the last transfer in December 2005. On a £-per-square-foot basis, the last sale (£255/sq ft) was about 37.3% above the typical sold price in the postcode.