Flat 21, 3 Market Yard Mews, Southwark, London, SE1 3TJ

Flat 21 is a two-bedroom detached house in Southwark, London, London (SE1 3TJ). It has a recorded floor area of 87 m² (around 936 sq ft), construction records dating it to 1950-1966 and council tax band F. At 87 m² this is the 11th smallest of 22 units on EPC record in the building, where floor areas span 31–123 m². The building's EPC ratings span D to B, with this unit at the bottom. Other recorded features include a balcony. The latest certificate (April 2018) shows a D (score 67), on the cusp of jumping into the C band. Earlier certificates rated it C (April 2010); the latest reading is one band lower. Between certificates, wall efficiency dropped from Good to Poor. The recommended improvements would push it to C (score 79).

It hasn't traded since November 2010, a hold of 16 years that's notably long for the area. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2000–2010, sale prices on this property compounded at 7% per year. Today's modelled estimate of £828,000 sits 79.8% above the 2010 sale of £460,500. On a £-per-square-foot basis, the last sale (£492/sq ft) was about 42.4% above the typical sold price in the postcode.