19 Blackwell House, The Embankment, Nash Mills Wharf, Hemel Hempstead, HP3 9FX

19 Blackwell House is a two-bedroom property in Nash Mills Wharf, Hemel Hempstead, Hemel Hempstead (HP3 9FX). It has a recorded floor area of 60 m² (around 646 sq ft), construction records dating it to 2012-2021 and council tax band D. At 60 m² this is the 8th smallest of 36 units on EPC record in the building, where floor areas span 46–83 m². The building's EPC ratings span D to B, with this unit at the bottom. On EPC score it ranks last in the building (64 versus a best of 87). Other recorded features include a balcony. The latest certificate (January 2026) shows a D (score 64), on the cusp of jumping into the C band. Earlier certificates rated it C (October 2015); the latest reading is one band lower. Between certificates, wall efficiency dropped from Very Good to Good and window efficiency dropped from Very Good to Average. The recommended improvements would push it to C (score 78). Main heating runs on electricity. This certificate was lodged in the last six months, so the rating reflects current condition.

On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Last sold in November 2015, so it's been off the market for around 11 years.