221a, Birchfield Road East, Northampton, NN3 2BZ

221a is a mid-terrace house in Northampton (NN3 2BZ). It has a recorded floor area of 68 m² (around 732 sq ft), construction records dating it to 1930-1949 and council tax band A. The latest certificate (May 2013) shows an E (score 53), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since April 2010. Between certificates, roof efficiency went from Very Poor to Good and window efficiency went from Average to Good; while lighting dropped from Very Good to Average. The recommended improvements would lift it to C (score 70), a 2-band jump. The latest certificate is from May 2013, so improvements made since then won't be reflected. At 68 m² this is the 10th smallest of 28 units on EPC record in the building, where floor areas span 30–205 m². The building's EPC ratings span F to B across 28 units on file.

It hasn't traded since May 2010, a hold of 16 years that's notably long for the area. Today's modelled estimate of £236,000 is 11.1% above the 2010 sale price. On a £-per-square-foot basis, the last sale (£290/sq ft) was about 108% above the typical sold price in the postcode. At 68 m² it's 24.4% smaller than the typical home in the postcode (90 m² median across 27 EPCs). One historical planning record sits against the property in 2013.