10 Butler Avenue, Harrow, HA1 4EH

10 Butler Avenue is a two-bedroom detached house in Harrow (HA1 4EH). It has a recorded floor area of 97 m² (around 1044 sq ft), construction records dating it to 1900-1929 and council tax band C. The latest certificate (January 2019) shows a D (score 66), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since December 2008. Between certificates, window efficiency went from Poor to Average and lighting went from Poor to Very Good. The recommended improvements would push it to C (score 78). At 97 m² this is the 9th smallest of 20 units on EPC record in the building, where floor areas span 24–174 m². The building's EPC ratings span F to C across 20 units on file.

Held since September 1999 — that's 27 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. Today's modelled estimate of £486,000 sits 276.5% above the 1999 sale of £129,100. On a £-per-square-foot basis, the last sale (£124/sq ft) was about 59.6% below the postcode norm.