123b, Castlehaven Road, Camden, London, NW1 8SJ

123b is a two-bedroom end-of-terrace house in Camden, London, London (NW1 8SJ). It has a recorded floor area of 38 m² (around 409 sq ft), construction records dating it to 1900-1929 and council tax band B. At 38 m² this is the smallest unit on EPC record across the building (38–156 m²). The building's EPC ratings span E to C, with this unit at the bottom. Other recorded features include a balcony. Period features are noted in the property record. The latest certificate (June 2020) shows an E (score 48), well below the UK norm with real room to improve. When first surveyed in January 2017 the rating was F, the property has climbed 1 band since. Between certificates, roof efficiency went from Very Poor to Average; while main heating dropped from Average to Very Poor. The recommended improvements would lift it to C (score 74), a 2-band jump. Main heating runs on electricity.

Untraded for 28 years, with the last transfer in September 1998. 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 £512,000 sits 220% above the 1998 sale of £160,000. On a £-per-square-foot basis, the last sale (£391/sq ft) was about 19.8% below the postcode norm. At 38 m² it sits well below the postcode median (108 m² across 13 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 85% of similar EPCs).