248a, Northolt Road, Harrow, HA2 8DU

248a is a semi-detached house in Harrow (HA2 8DU). It has a recorded floor area of 48 m² (around 517 sq ft) and construction records dating it to 1930-1949. The latest certificate (January 2019) shows an E (score 54), well below the UK norm with real room to improve. The rating has held steady at E across 3 certificates since October 2008. Between certificates, window efficiency went from Very Poor to Average; while roof efficiency dropped from Poor to Very Poor and hot-water efficiency dropped from Very Good to Good. The recommended improvements would push it to D (score 62). At 48 m² this is the 5th smallest of 23 units on EPC record in the building, where floor areas span 45–107 m². The building's EPC ratings span F to C across 23 units on file.

Across 2000–2019, sale prices on this property compounded at -6.2% per year. Today's modelled estimate of £460,000 sits 922.2% above the 2019 sale of £45,000. On a £-per-square-foot basis, the last sale (£87/sq ft) was about 67.9% below the postcode norm. 11 planning records sit against the property, 6 approved, 0 refused. Past consents include an extension and partial demolition, meaningful when judging how the property has evolved. The record references listed-building consent, which constrain future alterations. At 48 m² it's 18.6% smaller than the typical home in the postcode (59 m² median across 22 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 73% of similar EPCs). Last sale on file: £45,000 in February 2019.