12 Alnwick Close, Langdon Hills, Basildon, SS16 6NZ

12 Alnwick Close is a semi-detached house in Langdon Hills, Basildon, Basildon (SS16 6NZ). It has a recorded floor area of 41 m² (around 441 sq ft), construction records dating it to 1996-2002 and council tax band B. At 41 m² this is the 2nd smallest of 12 units on EPC record in the building, where floor areas span 40–123 m². The building's EPC ratings span D to C, with this unit at the top. The latest certificate (September 2018) shows a C (score 70). The rating has held steady at C across 2 certificates since October 2008. Between certificates, roof efficiency went from Good to Very Good; while lighting dropped from Good to Average. Main heating runs on electricity.

Untraded for 28 years, with the last transfer in February 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 £184,000 sits 287% above the 1998 sale of £47,550. On a £-per-square-foot basis, the last sale (£108/sq ft) was about 44% below the postcode norm. At 41 m² it sits well below the postcode median (61 m² across 11 EPCs), making it one of the more compact homes locally.