22a, Amwell Road, Cambridge, CB4 2UH

22a is a semi-detached house in Cambridge (CB4 2UH). It has a recorded floor area of 24 m² (around 258 sq ft), construction records dating it to 1983-1990 and council tax band A. At 24 m² this is the smallest unit on EPC record across the building (24–97 m²). The building's EPC ratings span E to B across 41 units on file. The latest certificate (April 2023) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it C (March 2013); the latest reading is one band lower. Between certificates, wall efficiency went from Poor to Good, roof efficiency went from Average to Good and window efficiency went from Average to Good; while hot-water efficiency dropped from Average to Very Poor and main heating dropped from Average to Very Poor. The recommended improvements would push it to C (score 76). Main heating runs on electricity.

Untraded for 30 years, with the last transfer in June 1996. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £136,000 sits 353.3% above the 1996 sale of £30,000. On a £-per-square-foot basis, the last sale (£116/sq ft) was about 42.4% below the postcode norm. At 24 m² it sits well below the postcode median (57 m² across 40 EPCs), making it one of the more compact homes locally.