17 Britannia Close, Northolt, UB5 6JY

17 Britannia Close is a one-bedroom detached house in Northolt (UB5 6JY). It has a recorded floor area of 37 m² (around 398 sq ft), construction records dating it to 1983-1990 and council tax band B. The latest certificate (June 2022) shows a C (score 72). When first surveyed in January 2009 the rating was E, the property has climbed 2 bands since. Between certificates, window efficiency went from Very Poor to Average, hot-water efficiency went from Very Poor to Good and lighting went from Very Poor to Average. At 37 m² this is the 5th smallest of 54 units on EPC record in the building, where floor areas span 30–124 m². The building's EPC ratings span E to B across 54 units on file.

Untraded for 19 years, with the last transfer in April 2007. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 37 m² it sits well below the postcode median (82 m² across 53 EPCs), making it one of the more compact homes locally. Across 1997–2007, sale prices on this property compounded at 13.5% per year. Today's modelled estimate of £208,000 is 48.6% above the 2007 sale price. On a £-per-square-foot basis, the last sale (£352/sq ft) was about 33.1% above the typical sold price in the postcode.