21 Butlers & Colonial Wharf, Southwark, London, SE1 2PX

21 Butlers & Colonial Wharf is a one-bedroom end-of-terrace house in Southwark, London, London (SE1 2PX). It has a recorded floor area of 90 m² (around 969 sq ft), construction records dating it to 1900-1929 and council tax band E. The latest certificate (December 2019) shows an E (score 42), well below the UK norm with real room to improve. Earlier certificates rated it D (October 2009); the latest reading is one band lower. Between certificates, hot-water efficiency went from Poor to Average, lighting went from Very Poor to Good and main heating went from Poor to Average; while wall efficiency dropped from Good to Very Poor and roof efficiency dropped from Average to Very Poor. The recommended improvements would push it to D (score 66). Main heating runs on electricity. At 90 m² this is the 31st smallest of 46 units on EPC record in the building, where floor areas span 49–170 m². The building's EPC ratings span G to B across 46 units on file. Other recorded features include a loft. Period features are noted in the property record.

Untraded for 21 years, with the last transfer in October 2005. Across 1999–2005, sale prices on this property compounded at 4.9% per year. Today's modelled estimate of £683,000 sits 110.2% above the 2005 sale of £325,000. On a £-per-square-foot basis, the last sale (£335/sq ft) was about 18.2% below the postcode norm. It lags the bulk of the postcode on energy efficiency (less efficient than 84% of similar EPCs).