1b, Allens Avenue, Norwich, NR7 8EP

1b is a two-bedroom detached house in Norwich (NR7 8EP). It has a recorded floor area of 51 m² (around 549 sq ft), construction records dating it to 1967-1975 and council tax band C. The latest certificate (September 2009) shows a D (score 68), on the cusp of jumping into the C band. When first surveyed in July 2009 the rating was G, the property has climbed 3 bands since. Between certificates, roof efficiency went from Very Poor to Very Good, window efficiency went from Poor to Good and hot-water efficiency went from Very Poor to Very Good. The recommended improvements would push it to C (score 75). The latest certificate is from September 2009, so improvements made since then won't be reflected.

Held since July 2010 — that's 16 years off the open market, well above the local norm. Across 2009–2010, sale prices on this property compounded at 28% per year. Today's modelled estimate of £238,000 sits 54.5% above the 2010 sale of £154,000. On a £-per-square-foot basis, the last sale (£281/sq ft) was about 72.5% above the typical sold price in the postcode. At 51 m² it sits well below the postcode median (96 m² across 27 EPCs), making it one of the more compact homes locally.