30 Onslow Road, Richmond, TW10 6QE

30 Onslow Road is a six-bedroom detached house in Richmond (TW10 6QE). It has a recorded floor area of 305 m² (around 3283 sq ft), construction records dating it to 1900-1929 and council tax band H. The latest certificate (March 2018) shows an E (score 44), well below the UK norm with real room to improve. When first surveyed in June 2010 the rating was F, the property has climbed 1 band since. Between certificates, roof efficiency went from Very Poor to Average, window efficiency went from Very Poor to Poor and lighting went from Very Poor to Average; while hot-water efficiency dropped from Very Good to Good and main heating dropped from Very Good to Good. The recommended improvements would lift it to C (score 73), a 2-band jump. Period features are noted in the property record.

Held since January 2001 — that's 25 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 305 m² the property is well over the postcode median (73 m² across 18 EPCs), placing it in the larger end of the local stock. It lags the bulk of the postcode on energy efficiency (less efficient than 72% of similar EPCs). 6 bedrooms is on the larger side for this postcode, where 4 is the typical count. Today's modelled estimate of £3,930,000 sits 349.1% above the 2001 sale of £875,000. On a £-per-square-foot basis, the last sale (£267/sq ft) was about 52.6% below the postcode norm.