Flat 20, 3 Market Yard Mews, Southwark, London, SE1 3TJ

Flat 20 is a two-bedroom mid-terrace house in Southwark, London, London (SE1 3TJ). It has a recorded floor area of 31 m² (around 334 sq ft), construction records dating it to 2007-2011 and council tax band E. At 31 m² this is the smallest unit on EPC record across the building (31–123 m²). The building's EPC ratings span D to B across 22 units on file. The latest certificate (September 2021) shows a C (score 78), near the top of the C band. The rating has held steady at C across 3 certificates since July 2009. Between certificates, window efficiency went from Average to Good and lighting went from Very Poor to Very Good.

At 31 m² it sits well below the postcode median (90 m² across 23 EPCs), making it one of the more compact homes locally. Across 2000–2013, sale prices on this property compounded at 6.3% per year. Today's modelled estimate of £541,000 is 11.5% above the 2013 sale price. On a £-per-square-foot basis, the last sale (£1,453/sq ft) was about 330.2% above the typical sold price in the postcode. 13 years since the last transfer (January 2013).