13a, Quadrant Road, Richmond, TW9 1DH

13a is a one-bedroom mid-terrace house in Richmond (TW9 1DH). It has a recorded floor area of 66 m² (around 710 sq ft), construction records dating it to before 1900 and council tax band D. The latest certificate (March 2019) shows a D (score 67), on the cusp of jumping into the C band. Earlier certificates rated it C (March 2009); the latest reading is one band lower. Between certificates, window efficiency dropped from Good to Average and lighting dropped from Very Good to Very Poor. The recommended improvements would push it to C (score 74). At 66 m² this is the 8th smallest of 13 units on EPC record in the building, where floor areas span 42–180 m². The building's EPC ratings span E to B across 13 units on file. Period features are noted in the property record.

Held since December 1997 — that's 29 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 66 m² it's 26.9% larger than the typical home in the postcode (52 m² median across 12 EPCs). Today's modelled estimate of £750,000 is 38.9% above the 1997 sale price. On a £-per-square-foot basis, the last sale (£760/sq ft) was about 47.2% above the typical sold price in the postcode.