18 20, Flat D, Friern Barnet Road, London, N11 1NA

18 20 is an end-of-terrace house in London (N11 1NA). It has a recorded floor area of 39 m² (around 420 sq ft) and construction records dating it to 1900-1929. At 39 m² this is the 3rd smallest of 6 units on EPC record in 18 20, where floor areas span 35–53 m². The building's EPC ratings span D to C, with this unit at the top. The latest certificate (September 2017) shows a C (score 70). The rating has held steady at C across 2 certificates since June 2010. Between certificates, window efficiency went from Poor to Average and lighting went from Average to Very Good.

Untraded for 18 years, with the last transfer in June 2008. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 39 m² it sits well below the postcode median (58 m² across 20 EPCs), making it one of the more compact homes locally. Across 1999–2008, sale prices on this property compounded at 11.5% per year. Today's modelled estimate of £267,000 is 40.5% above the 2008 sale price. On a £-per-square-foot basis, the last sale (£453/sq ft) was about 208.5% above the typical sold price in the postcode.