121a, St James Road, Watford, WD18 0DY

121a is an end-of-terrace house in Watford (WD18 0DY). It has a recorded floor area of 49 m² (around 527 sq ft), construction records dating it to 1900-1929 and council tax band C. At 49 m² this is the smallest unit on EPC record across the building (49–144 m²). The building's EPC ratings span E to C, with this unit at the top. The latest certificate (May 2019) shows a C (score 75), near the top of the C band. When first surveyed in May 2018 the rating was D, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Good, roof efficiency went from Very Poor to Good and window efficiency went from Good to Very Good.

Today's modelled estimate of £240,000 is 37.4% below the 2018 sale of £383,500, a rare downward gap that often correlates with deferred maintenance or unfinished works. On a £-per-square-foot basis, the last sale (£727/sq ft) was about 213.1% above the typical sold price in the postcode. At 49 m² it sits well below the postcode median (85 m² across 30 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 83% of similar EPCs). Most recent transfer: August 2018 at £383,500.