Flat 1, 1 Colnbrook Street, Southwark, London, SE1 6EZ

Flat 1 is a one-bedroom detached house in Southwark, London, London (SE1 6EZ). It has a recorded floor area of 57 m² (around 614 sq ft), construction records dating it to 1950-1966 and council tax band C. At 57 m² this is the 3rd smallest of 6 units on EPC record in the building, where floor areas span 48–124 m². The building's EPC ratings span E to D, with this unit at the bottom. On EPC score it ranks last in the building (39 versus a best of 65). Other recorded features include a basement. The latest certificate (September 2022) shows an E (score 39), well below the UK norm with real room to improve. Earlier certificates rated it D (August 2012); the latest reading is one band lower. Between certificates, window efficiency dropped from Good to Average and hot-water efficiency dropped from Average to Very Poor. The recommended improvements would lift it to C (score 72), a 2-band jump. Main heating runs on electricity.

Held since January 2011 — that's 15 years off the open market, well above the local norm. At 57 m² it sits well below the postcode median (112 m² across 17 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 76% of similar EPCs). Today's modelled estimate of £403,000 is 43.9% above the 2011 sale price. On a £-per-square-foot basis, the last sale (£456/sq ft) was about 44.8% below the postcode norm.