23b, Herbert Road, Greenwich, London, SE18 3TB

23b is an end-of-terrace house in Greenwich, London, London (SE18 3TB). It has a recorded floor area of 24 m² (around 258 sq ft) and construction records dating it to 1976-1982. At 24 m² this is the smallest unit on EPC record across the building (24–77 m²). The building's EPC ratings span E to C, with this unit at the top. On EPC score it ranks first in the building (71 versus a worst of 43). The latest certificate (December 2021) shows a C (score 71). When first surveyed in March 2017 the rating was F, the property has climbed 3 bands since. Between certificates, wall efficiency went from Average to Good, roof efficiency went from Very Poor to Poor and window efficiency went from Average to Good. Main heating runs on electricity.

Untraded for 24 years, with the last transfer in March 2002. Across 1997–2002, sale prices on this property compounded at 29.2% per year. Today's modelled estimate of £321,000 sits 60.5% above the 2002 sale of £200,000. On a £-per-square-foot basis, the last sale (£774/sq ft) was about 240% above the typical sold price in the postcode. At 24 m² it sits well below the postcode median (51 m² across 6 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 83% of similar EPCs). One historical planning record sits against the property in 2012.