20a, Marlborough Road, Richmond, TW10 6JR

20a is a four-bedroom semi-detached house in Richmond (TW10 6JR). It has a recorded floor area of 109 m² (around 1173 sq ft), construction records dating it to before 1900 and council tax band F. The latest certificate (December 2022) shows a C (score 69), just inside the C band. The rating has held steady at C across 2 certificates since May 2010. Between certificates, wall efficiency went from Very Poor to Poor and window efficiency went from Very Poor to Poor; while hot-water efficiency dropped from Very Good to Good and lighting dropped from Very Good to Good. At 109 m² this is the 19th 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 across 30 units on file. Other recorded features include a conservatory.

It hasn't traded since February 2008, a hold of 18 years that's notably long for the area. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. Across 1999–2008, sale prices on this property compounded at 8.4% per year. Today's modelled estimate of £1,184,000 sits 75.4% above the 2008 sale of £675,000. Its energy rating outperforms most of the postcode (better than 72% of similar EPCs). 4 bedrooms is on the larger side for this postcode, where 3 is the typical count.