Flat 4, 1 Frognal, London, NW3 6AL

Flat 4 is an end-of-terrace house in London (NW3 6AL). It has a recorded floor area of 80 m² (around 861 sq ft) and construction records dating it to 1900-1929. At 80 m² this is the smallest unit on EPC record across the building (80–109 m²). The building's EPC ratings span E to C across 4 units on file. The latest certificate (January 2021) shows a D (score 58), a step below the typical UK home. The rating has held steady at D across 2 certificates since August 2010. Between certificates, lighting went from Very Poor to Average; while roof efficiency dropped from Average to Very Poor and window efficiency dropped from Good to Average.

Untraded for 30 years, with the last transfer in December 1995. 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 £780,000 sits 403.2% above the 1995 sale of £155,000. On a £-per-square-foot basis, the last sale (£180/sq ft) was about 49.7% below the postcode norm.