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

Bedrooms
2
Bathrooms
2
Floor area
73 m²
786 sq ft
Energy rating
C
Score 71
Council tax
Band D
Tenure
Private Rental
Overview

About 21 Blackwell House

A plain-English summary derived from public records, EPC certificates, sold prices and local data.

21 Blackwell House is a two-bedroom property in Nash Mills Wharf, Hemel Hempstead, Hemel Hempstead (HP3 9FX). It has a recorded floor area of 73 m² (around 786 sq ft), construction records dating it to 2012-2021 and council tax band D. The latest certificate (November 2025) shows a C (score 71). 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. Main heating runs on electricity. At 73 m² this is the 28th 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. Other recorded features include a balcony.

11 years since the last transfer (October 2015).

Specifications

What this property has

Pulled from EPC certificates, claim submissions and our property model. Empty categories are hidden — we only show what's known.

Inside

  • Bedrooms2
  • Bathrooms2
  • EnsuiteYes

Outside

  • ParkingUnderground
  • BalconyYes

Building

  • LiftYes
Before you decide

Everything you need to know about 21 Blackwell House

The true value, the hidden risks and the full sale history, in one report.

Pick your report · every report is £14.99

One time fee only - money back guarantee

Preview of the full property report

The data behind every report

  • HM Land Registry, source of sold price history
  • Department for Education, source of schools data
  • Police.uk, source of crime statistics
  • Department for Transport, source of stations and transport links
  • Environment Agency, source of flood risk data
  • Department for Environment, Food & Rural Affairs, source of road noise data
  • PlanIt, source of planning application records
Energy

Energy performance

Every EPC certificate filed against this property — current rating, recorded improvements, and where there's headroom to reach a higher band.

21 Blackwell House's carbon output is low for the local stock.

Current Certificate(1 of 2)
Nov 2025

EPC Rating

A
B
C
C71
D
E
F
G
Main Heating
Electric
Main Fuel
Electric
Hot Water
Average
Windows
Average
CO2 Emissions
0.8 t/year
Occupancy
Rented

Property Improvements

Changes detected from historical EPC data

Nov 2025from Oct 2015
Hot Water
ImmersionImmersion (Off-Peak)

Hot water system upgraded

SDL Surveying

Get a survey for this property

Level 3 Building Survey

21st century2nd Floor FlatEPC CNo mains gas

Because the property has no mains gas supply, we believe a Level 3 building survey should be considered.

From £955 · Includes VAT

Planning

Planning history

Applications and permits filed against 21 Blackwell House, The Embankment, Nash Mills Wharf, Hemel Hempstead, HP3 9FX, sourced from the PlanIt planning register.

21 Blackwell House has no planning applications on record.

2

But the area is active

2 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.

Price

Sales history & valuation

Recorded transactions, our model's current estimate, and a quick read on what neighbouring properties have sold for.
Current estimate

£324,000

Modelled from EPC, postcode comparables.

See how we calculated this
Last sold (2015)

£309,950

Recorded with HM Land Registry.

Sales timeline

  1. 30 October 2015Most recent

    £309,950

Median price across the last 5 sales in HP3 9FX: £280,000 (2025–2024).

On the street

Versus other The Embankment homes

Four headline reads against 35 similar flats on this street, drawn from the latest EPC and Land Registry data.

Years Held for 21 Blackwell House runs comfortably ahead of the street norm.

Price per m²

£4,246

Street avg £4,713

Strongly below

Floor Area

73 m²

Street avg 64 m²

Strongly above

Habitable Rooms

3 rooms

Street avg 3 rooms

Above

CO₂ Emissions

0.8 t/year

Street avg 1.6 t/year

Strongly above
Before you decide

Everything you need to know about 21 Blackwell House

The true value, the hidden risks and the full sale history, in one report.

Pick your report · every report is £14.99

One time fee only - money back guarantee

Preview of the full property report

The data behind every report

  • HM Land Registry, source of sold price history
  • Department for Education, source of schools data
  • Police.uk, source of crime statistics
  • Department for Transport, source of stations and transport links
  • Environment Agency, source of flood risk data
  • Department for Environment, Food & Rural Affairs, source of road noise data
  • PlanIt, source of planning application records
Comparables

Similar properties nearby

A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
£316k

1 Blackwell House, The Embankment, Nash Mills Wharf

HP3 9FX

2 bed2 bath
£270k

1 Apsley Grange

HP3 9SY

2 bed
£247k

1 Barn Close

HP3 9PJ

2 bed1 bath
£438k

1 Barnard Way

HP3 9EX

2 bed1 bath
£184k

1 Basildon Court, Croxley Road, Nash Mills Wharf

HP3 9GY

2 bed1 bath
£347k

1 Butterfly Crescent, Nash Mills Wharf

HP3 9GS

1 bed1 bath
£403k

1 Brereton Court

HP3 9JS

3 bed1 bath
£227k

1 Albion Court, Ebberns Road

HP3 9DE

1 bed1 bath
Area

The neighbourhood at a glance

A condensed read of the local area. Each tile links through to the full breakdown on the Hemel Hempstead district page.
Full Hemel Hempstead report

Rail-style transport is unusually close for this postcode.

Crime

3/mo

Steady year-on-year across the wider district.

Nearest stop

0.2 km

Mill Close — bus stop.

Closest school

0.4 km

Nash Mills Church of England Primary School. 18 schools nearby.

Go deeper on the local area

A Local Area report breaks down crime, transport links, schools and air quality in depth.

Noise

Road noise across the postcode

Modelled day and night-time noise levels around HP3 9FX from Defra's strategic mapping. The pin marks this postcode's centroid.
Daytime road noise heatmap for HP3 9FX

Daytime· 07:00 – 23:00

49.8dB

Low
Night-time road noise heatmap for HP3 9FX

Night-time· 23:00 – 07:00

40.1dB

Low
55 dB
60 dB
65 dB
70 dB
75 dB
80 dB
Defra Road Noise Strategic Mapping, Round 4
FAQ

Common questions

The questions buyers, sellers and homeowners most often ask about 21 Blackwell House, The Embankment, Nash Mills Wharf, Hemel Hempstead, HP3 9FX. Each answer is also embedded as structured data for search engines.