11a, Gowlett Road, Southwark, London, SE15 4HX

11a is an end-of-terrace house in Southwark, London, London (SE15 4HX). It has a recorded floor area of 65 m² (around 700 sq ft) and construction records dating it to 1900-1929. The latest certificate (March 2019) shows a D (score 61), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since January 2009. Between certificates, window efficiency went from Poor to Good and lighting went from Very Poor to Very Good; while wall efficiency dropped from Good to Very Poor. The recommended improvements would push it to C (score 76). At 65 m² this is the 15th smallest of 30 units on EPC record in the building, where floor areas span 30–186 m². The building's EPC ratings span G to C across 30 units on file.

It hasn't traded since April 1999, a hold of 27 years that's notably long for the area. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £565,000 sits 684.7% above the 1999 sale of £72,000. On a £-per-square-foot basis, the last sale (£103/sq ft) was about 74.3% below the postcode norm.