Marinwood House, St Georges Lane, Ascot, SL5 7ES

Marinwood House is a five-bedroom detached house in Ascot (SL5 7ES). It has a recorded floor area of 343 m² (around 3692 sq ft), construction records dating it to 1950-1966 and council tax band H. There is a swimming pool on the plot, uncommon for the area. The latest certificate (March 2017) shows a D (score 64), on the cusp of jumping into the C band. When first surveyed in August 2009 the rating was E, the property has climbed 1 band since. Between certificates, wall efficiency went from Poor to Good, window efficiency went from Very Poor to Good and hot-water efficiency went from Average to Good. The recommended improvements would push it to C (score 74).

Held since November 1998 — that's 28 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. At 343 m² the property is well over the postcode median (95 m² across 12 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £2,004,000 sits 257.9% above the 1998 sale of £560,000. On a £-per-square-foot basis, the last sale (£152/sq ft) was about 64.2% below the postcode norm.