21a, Finchley Road, Westcliff On Sea, SS0 8AD

21a is an end-of-terrace house in Westcliff On Sea (SS0 8AD). It has a recorded floor area of 53 m² (around 570 sq ft), construction records dating it to 1900-1929 and council tax band B. The latest certificate (March 2015) shows a D (score 58), a step below the typical UK home. The rating has held steady at D across 2 certificates since December 2008. Between certificates, wall efficiency dropped from Good to Very Poor. The recommended improvements would push it to C (score 74). The latest certificate is from March 2015, so improvements made since then won't be reflected. At 53 m² this is the 16th smallest of 54 units on EPC record in the building, where floor areas span 34–174 m². The building's EPC ratings span E to C across 54 units on file.

Untraded for 29 years, with the last transfer in December 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 £221,000 sits 408% above the 1996 sale of £43,500. On a £-per-square-foot basis, the last sale (£76/sq ft) was about 43.8% below the postcode norm. At 53 m² it's 23.2% smaller than the typical home in the postcode (69 m² median across 53 EPCs).