79a, The Heights, Northolt, UB5 4BS

79a is a one-bedroom semi-detached house in Northolt (UB5 4BS). It has a recorded floor area of 70 m² (around 753 sq ft), construction records dating it to 1930-1949 and council tax band C. At 70 m² this is the 3rd smallest of 31 units on EPC record in the building, where floor areas span 43–149 m². The building's EPC ratings span E to C, with this unit at the top. The latest certificate (February 2020) shows a C (score 71). When first surveyed in January 2010 the rating was D, the property has climbed 1 band since. Between certificates, window efficiency went from Average to Good, hot-water efficiency went from Average to Good and lighting went from Very Poor to Very Good; while wall efficiency dropped from Poor to Very Poor.

Held since December 2003 — that's 22 years off the open market, well above the local norm. Across 1998–2003, sale prices on this property compounded at 14.1% per year. Today's modelled estimate of £305,000 sits 133.4% above the 2003 sale of £130,700. On a £-per-square-foot basis, the last sale (£173/sq ft) was about 34.8% below the postcode norm. At 70 m² it's 17.6% smaller than the typical home in the postcode (85 m² median across 30 EPCs). Its energy rating outperforms most of the postcode (better than 73% of similar EPCs).