12b, Balaclava Road, Surbiton, KT6 5PN

12b is a one-bedroom semi-detached house in Surbiton (KT6 5PN). It has a recorded floor area of 36 m² (around 388 sq ft), construction records dating it to 1900-1929 and council tax band C. The latest certificate (September 2025) shows a C (score 69), just inside the C band. The rating has held steady at C across 4 certificates since March 2009. Between certificates, roof efficiency went from Average to Good and lighting went from Very Poor to Good; while window efficiency dropped from Average to Poor and hot-water efficiency dropped from Very Good to Good. At 36 m² this is the 9th smallest of 70 units on EPC record in the building, where floor areas span 27–227 m². The building's EPC ratings span F to A across 70 units on file.

Untraded for 16 years, with the last transfer in October 2010. Today's modelled estimate of £284,000 sits 57.8% above the 2010 sale of £180,000. On a £-per-square-foot basis, the last sale (£465/sq ft) was about 44.7% above the typical sold price in the postcode. At 36 m² it sits well below the postcode median (69 m² across 69 EPCs), making it one of the more compact homes locally.