6 Grosvenor Mansions, Grosvenor Road, Westcliff On Sea, SS0 8ER

6 Grosvenor Mansions is a detached house in Westcliff On Sea (SS0 8ER). It has a recorded floor area of 65 m² (around 700 sq ft), construction records dating it to 1900-1929 and council tax band B. At 65 m² this is the smallest unit on EPC record across the building (65–82 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 (53 versus a best of 75). The latest certificate (November 2018) shows an E (score 53), well below the UK norm with real room to improve. Earlier certificates rated it C (October 2008); the latest reading is 2 bands lower. Between certificates, window efficiency went from Average to Good and lighting went from Very Poor to Poor; while wall efficiency dropped from Good to Very Poor and roof efficiency dropped from Poor to Very Poor. The recommended improvements would lift it to C (score 69), a 2-band jump.

Held since December 2008 — that's 17 years off the open market, well above the local norm. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2002–2008, sale prices on this property compounded at 9.9% per year. Today's modelled estimate of £215,000 sits 72% above the 2008 sale of £125,000. On a £-per-square-foot basis, the last sale (£179/sq ft) was about 27.9% above the typical sold price in the postcode.