20c, Marlborough Road, Richmond, TW10 6JR

20c is a detached house in Richmond (TW10 6JR). It has a recorded floor area of 73 m² (around 786 sq ft), construction records dating it to 1900-1929 and council tax band E. At 73 m² this is the 7th smallest of 30 units on EPC record in the building, where floor areas span 51–408 m². The building's EPC ratings span E to B, with this unit at the bottom. On EPC score it ranks last in the building (40 versus a best of 82). The latest certificate (June 2013) shows an E (score 40), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 75), a 2-band jump. The latest certificate is from June 2013, so improvements made since then won't be reflected.

Last sold in September 2014, so it's been off the market for around 12 years. Across the public record there are 4 sales, relatively high churn for a single property. At 73 m² it's 29.3% smaller than the typical home in the postcode (103 m² median across 29 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 90% of similar EPCs). Across 1996–2014, sale prices on this property compounded at 8.8% per year. On a £-per-square-foot basis, the last sale (£1,094/sq ft) was about 89.9% above the typical sold price in the postcode.