16a, Colnbrook Street, Southwark, London, SE1 6EZ

16a is an end-of-terrace house in Southwark, London, London (SE1 6EZ). It has a recorded floor area of 41 m² (around 441 sq ft) and construction records dating it to before 1900. At 41 m² this is the smallest unit on EPC record across the building (41–140 m²). The building's EPC ratings span E to D, with this unit at the top. The latest certificate (October 2014) shows a D (score 65), on the cusp of jumping into the C band. The recommended improvements would push it to C (score 79). The latest certificate is from October 2014, so improvements made since then won't be reflected.

Held since March 2008 — that's 18 years off the open market, well above the local norm. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 41 m² it sits well below the postcode median (112 m² across 17 EPCs), making it one of the more compact homes locally. Today's modelled estimate of £825,000 is 32% above the 2008 sale price. On a £-per-square-foot basis, the last sale (£1,416/sq ft) was about 74.5% above the typical sold price in the postcode.