Flat 1, 23 High Street, Hemel Hempstead, HP1 3AA

Flat 1 is an end-of-terrace house in Hemel Hempstead (HP1 3AA). It has a recorded floor area of 37 m² (around 398 sq ft), construction records dating it to before 1900 and council tax band B. At 37 m² this is the smallest unit on EPC record across the building (37–46 m²). On EPC score it ranks first in the building (52 versus a worst of 50). The latest certificate (March 2020) shows an E (score 52), well below the UK norm with real room to improve. Earlier certificates rated it D (March 2009); the latest reading is one band lower. Between certificates, wall efficiency dropped from Good to Poor and window efficiency dropped from Good to Average. The recommended improvements would lift it to C (score 77), a 2-band jump. Main heating runs on electricity.

2 planning records sit against the property, 2 approved, 0 refused. Past consents include subdivision and change of use to residential, meaningful when judging how the property has evolved. Across 2011–2020, sale prices on this property compounded at 4.8% per year. On a £-per-square-foot basis, the last sale (£452/sq ft) was about 64% above the typical sold price in the postcode. At 37 m² it's 18.7% smaller than the typical home in the postcode (46 m² median across 30 EPCs). Sold July 2020 for £180,000.