66b, Cromwell Road, Hayes, UB3 2PR

66b is a one-bedroom end-of-terrace house in Hayes (UB3 2PR). It has a recorded floor area of 40 m² (around 431 sq ft), construction records dating it to 1991-1995 and council tax band B. At 40 m² this is the smallest unit on EPC record across the building (40–119 m²). The building's EPC ratings span G to C, with this unit at the top. On EPC score it ranks first in the building (75 versus a worst of 1). The latest certificate (March 2021) shows a C (score 75), near the top of the C band. When first surveyed in April 2011 the rating was D, the property has climbed 1 band since. Between certificates, roof efficiency went from Average to Good, hot-water efficiency went from Poor to Good and lighting went from Very Poor to Very Good.

Sale prices here have outpaced England HPI: 6.8% per year against 0% for the wider region. Today's modelled estimate of £201,000 is 27.2% above the 2014 sale price. On a £-per-square-foot basis, the last sale (£367/sq ft) was about 40.8% above the typical sold price in the postcode. At 40 m² it sits well below the postcode median (73 m² across 27 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 74% of similar EPCs). On the market in November 2014 and unlisted since — roughly 12 years. Across the public record there are 5 sales, relatively high churn for a single property.