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

11 Blackwell House is a two-bedroom property in Nash Mills Wharf, Hemel Hempstead, Hemel Hempstead (HP3 9FX). It has a recorded floor area of 47 m² (around 506 sq ft), construction records dating it to 2012 onwards and council tax band D. The latest certificate (April 2026) shows a C (score 78), near the top of the C band. The rating has held steady at C across 2 certificates since October 2015. Between certificates, hot-water efficiency went from Very Poor to Average and main heating went from Very Poor to Poor; while wall efficiency dropped from Very Good to Good and window efficiency dropped from Very Good to Average. The recommended improvements would push it to B (score 83). Main heating runs on electricity. This certificate was lodged in the last six months, so the rating reflects current condition. At 47 m² this is the 4th 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 across 36 units on file.

Across 2015–2017, sale prices on this property compounded at 4.1% per year. Today's modelled estimate of £282,000 is 14.5% below the 2017 sale of £330,000, below the original sale price, which typically signals condition or completion-status changes worth verifying. On a £-per-square-foot basis, the last sale (£652/sq ft) was about 51.6% above the typical sold price in the postcode. Last sold in May 2017, so it's been off the market for around 9 years. At 47 m² it's 28.8% smaller than the typical home in the postcode (66 m² median across 35 EPCs).