23a, Armitage Way, Cambridge, CB4 2UE

23a is a one-bedroom detached house in Cambridge (CB4 2UE). It has a recorded floor area of 23 m² (around 248 sq ft), construction records dating it to 1983-1990 and council tax band A. The latest certificate (July 2020) shows a D (score 56), a step below the typical UK home. When first surveyed in January 2009 the rating was F, the property has climbed 2 bands since. Between certificates, wall efficiency went from Average to Good and hot-water efficiency went from Very Poor to Poor; while main heating dropped from Poor to Very Poor. The recommended improvements would push it to C (score 76). Main heating runs on electricity. At 23 m² this is the 2nd smallest of 40 units on EPC record in the building, where floor areas span 21–139 m². The building's EPC ratings span E to B across 40 units on file.

Untraded for 22 years, with the last transfer in January 2004. Across 2000–2004, sale prices on this property compounded at 21.5% per year. Today's modelled estimate of £156,000 sits 95% above the 2004 sale of £80,000. On a £-per-square-foot basis, the last sale (£323/sq ft) was about 51.1% above the typical sold price in the postcode. At 23 m² it sits well below the postcode median (50 m² across 39 EPCs), making it one of the more compact homes locally.