18a, High Street, Hemel Hempstead, HP1 3AE

18a is a mid-terrace house in Hemel Hempstead (HP1 3AE). It has a recorded floor area of 59 m² (around 635 sq ft), construction records dating it to 1900-1929 and council tax band C. The latest certificate (August 2019) shows an E (score 53), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since November 2008. Between certificates, lighting went from Good to Very Good; while window efficiency dropped from Poor to Very Poor. The recommended improvements would lift it to C (score 71), a 2-band jump. At 59 m² this is the 5th smallest of 10 units on EPC record in the building, where floor areas span 29–178 m². The building's EPC ratings span F to C across 10 units on file.

Untraded for 30 years, with the last transfer in March 1996. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £295,000 sits 210.5% above the 1996 sale of £95,000. On a £-per-square-foot basis, the last sale (£150/sq ft) was about 50.1% below the postcode norm. At 59 m² it sits well below the postcode median (94 m² across 9 EPCs), making it one of the more compact homes locally. 2 planning records sit against the property, 0 approved, 0 refused.