Flat 3, 12 Athelstan Road, Southampton, SO19 4DD

Flat 3 is a one-bedroom semi-detached house in Southampton (SO19 4DD). It has a recorded floor area of 24 m² (around 258 sq ft), construction records dating it to 1900-1929 and council tax band A. At 24 m² this is the 3rd smallest of 4 units on EPC record in the building, where floor areas span 21–42 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 (40 versus a best of 58). The latest certificate (April 2021) shows an E (score 40), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since May 2009. Between certificates, lighting went from Very Poor to Very Good; while wall efficiency dropped from Average to Poor and main heating dropped from Poor to Very Poor. The recommended improvements would lift it to C (score 71), a 2-band jump. Main heating runs on to be used only when there is no heating/hot.

It hasn't traded since November 2006, a hold of 20 years that's notably long for the area. Across 1996–2006, sale prices on this property compounded at 12% per year. Today's modelled estimate of £109,000 sits 81.8% above the 2006 sale of £59,950. On a £-per-square-foot basis, the last sale (£232/sq ft) was about 15.9% above the typical sold price in the postcode. At 24 m² it sits well below the postcode median (107 m² across 27 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 78% of similar EPCs).