20 Sigrist Square, Kingston Upon Thames, KT2 6JT

20 Sigrist Square is a detached house in Kingston Upon Thames (KT2 6JT). It has a recorded floor area of 50 m² (around 538 sq ft), construction records dating it to 1950-1966 and council tax band D. The latest certificate (May 2019) shows a C (score 69), just inside the C band. The rating has held steady at C across 2 certificates since March 2009. Between certificates, lighting went from Poor to Very Good and main heating went from Poor to Average; while wall efficiency dropped from Good to Poor and hot-water efficiency dropped from Average to Very Poor. The recommended improvements would push it to B (score 82). Main heating runs on electricity. At 50 m² this is the 11th smallest of 44 units on EPC record in the building, where floor areas span 40–64 m². The building's EPC ratings span E to B across 44 units on file.

Held since June 2006 — that's 20 years off the open market, well above the local norm. Today's modelled estimate of £372,000 sits 70.3% above the 2006 sale of £218,500. On a £-per-square-foot basis, the last sale (£406/sq ft) was about 56.1% above the typical sold price in the postcode.