Flat 3 4, 20 Gillingham Street, Westminster, London, SW1V 1AG

Flat 3 4 is a one-bedroom mid-terrace house in Westminster, London, London (SW1V 1AG). It has a recorded floor area of 42 m² (around 452 sq ft), construction records dating it to 2007 onwards and council tax band E. At 42 m² this is the smallest unit on EPC record across the building (42–74 m²). On EPC score it ranks last in the building (81 versus a best of 85). The property has underfloor heating on record, all of which lower running costs and tend to lift resale appeal. The latest certificate (March 2019) returns a B (score 81), comfortably above the UK average. The rating has held steady at B across 2 certificates since March 2009. Between certificates, wall efficiency went from Good to Very Good; while lighting dropped from Good to Poor and main heating dropped from Very Good to Good.

Untraded for 16 years, with the last transfer in May 2010. At 42 m² it sits well below the postcode median (62 m² across 36 EPCs), making it one of the more compact homes locally. Across 2004–2010, sale prices on this property compounded at 9.8% per year.