Flat 1b, 34 Grove Road, Surbiton, KT6 4BZ

Flat 1b is a mid-terrace house in Surbiton (KT6 4BZ). It has a recorded floor area of 48 m² (around 517 sq ft), construction records dating it to 1950-1966 and council tax band C. At 48 m² this is the smallest unit on EPC record across the building (48–104 m²). The building's EPC ratings span E to C across 5 units on file. The latest certificate (February 2019) shows a D (score 63), on the cusp of jumping into the C band. When first surveyed in January 2009 the rating was E, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Poor, window efficiency went from Very Poor to Average and hot-water efficiency went from Poor to Good. The recommended improvements would push it to C (score 72).

Untraded for 18 years, with the last transfer in December 2007. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. 6 planning records sit against the property, 6 approved, 0 refused. Past consents include partial demolition, meaningful when judging how the property has evolved. Across 2007–2007, sale prices on this property compounded at 56.3% per year. Today's modelled estimate of £331,000 is 32.4% above the 2007 sale price. On a £-per-square-foot basis, the last sale (£484/sq ft) was about 45.8% above the typical sold price in the postcode. At 48 m² it's 28.4% smaller than the typical home in the postcode (67 m² median across 23 EPCs).