Flat 1, 23 Osborne Road, Southsea, PO5 3LR

Flat 1 is a semi-detached house in Southsea (PO5 3LR). It has a recorded floor area of 39 m² (around 420 sq ft) and construction records dating it to 1900-1929. At 39 m² this is the 5th smallest of 7 units on EPC record in the building, where floor areas span 35–42 m². The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (39 versus a best of 72). The latest certificate (April 2021) shows an E (score 39), well below the UK norm with real room to improve. Earlier certificates rated it D (February 2009); the latest reading is one band lower. Between certificates, window efficiency went from Average to Good; while hot-water efficiency dropped from Average to Very Poor and lighting dropped from Good to Poor. The recommended improvements would lift it to C (score 80), a 2-band jump. Main heating runs on electricity.

At 39 m² it sits well below the postcode median (64 m² across 31 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 71% of similar EPCs). Today's modelled estimate of £125,000 is 38.9% above the 2013 sale price. On a £-per-square-foot basis, the last sale (£214/sq ft) was about 49.6% above the typical sold price in the postcode. Last changed hands 13 years ago, in October 2013. One historical planning record sits against the property in 2015.