1 The Square, Marlowes, Hemel Hempstead, HP1 1ER

1 The Square is a semi-detached house in Hemel Hempstead (HP1 1ER). It has a recorded floor area of 28 m² (around 301 sq ft), construction records dating it to 1950-1966 and council tax band A. At 28 m² this is the 4th smallest of 16 units on EPC record in the building, where floor areas span 27–63 m². The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (49 versus a best of 72). The latest certificate (November 2018) shows an E (score 49), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 73), a 2-band jump. Main heating runs on electricity.

Held since October 1999 — that's 27 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £128,000 sits 230.3% above the 1999 sale of £38,750. On a £-per-square-foot basis, the last sale (£129/sq ft) was about 35.2% below the postcode norm.