25a, Elphinstone Road, Southsea, PO5 3HP

25a is a five-bedroom semi-detached house in Southsea (PO5 3HP). It has a recorded floor area of 69 m² (around 743 sq ft), construction records dating it to before 1900 and council tax band A. The latest certificate (July 2012) shows a G (score 6), near the bottom of the EPC scale. Earlier certificates rated it D (October 2008); the latest reading is 3 bands lower. Between certificates, wall efficiency dropped from Poor to Very Poor and hot-water efficiency dropped from Good to Average. The recommended improvements would lift it to D (score 56), a 3-band jump. Main heating runs on to be used only when there is no heating/hot. The latest certificate is from July 2012, so improvements made since then won't be reflected. At 69 m² this is the 28th smallest of 40 units on EPC record in the building, where floor areas span 17–272 m². The building's EPC ratings span G to C, with this unit at the bottom. On EPC score it ranks last in the building (6 versus a best of 77).

Held since November 2010 — that's 16 years off the open market, well above the local norm. At 69 m² it's 27.8% larger than the typical home in the postcode (54 m² median across 39 EPCs). On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. 5 bedrooms is on the larger side for this postcode, where 3 is the typical count. Today's modelled estimate of £369,000 sits 53.8% above the 2010 sale of £240,000. On a £-per-square-foot basis, the last sale (£323/sq ft) was about 92.3% above the typical sold price in the postcode.