Model valuation£417,0008 Busby Close
Local market context
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
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 29th 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.
At 73 m² it's 17.7% larger than the typical home in the postcode (62 m² median across 35 EPCs). 11 years since the last transfer (October 2015).
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
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The data behind every report
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
Certificate validity
Valid until 12 November 2035
Property Improvements
Changes detected from historical EPC data
Nov 2025from Oct 2015
Hot Water
ImmersionImmersion (Off-Peak)
Hot water system upgraded
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 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.
Sales history & valuation
Recorded transactions, our model's current estimate, and a quick read on what neighbouring properties have sold for.
Current estimate
See how we calculated this£316,000
Modelled from EPC, postcode comparables.
Last sold (2015)
£309,950
Recorded with HM Land Registry.
Sales timeline
30 October 2015Most recent
£309,950
Median price across the last 5 sales in HP3 9FX: £280,000 (2025–2025).
Nearby sales in HP3 9FX
28 Blackwell House, The Embankment, Nash Mills Wharf, Hemel Hempstead, HP3 9FX
Sold Oct 2025
£280,00019 Blackwell House, The Embankment, Nash Mills Wharf, Hemel Hempstead, HP3 9FX
Sold Sept 2025
£285,00015 Blackwell House, The Embankment, Nash Mills Wharf, Hemel Hempstead, HP3 9FX
Sold Jul 2025
£235,00010 Blackwell House, The Embankment, Nash Mills Wharf, Hemel Hempstead, HP3 9FX
Sold Mar 2025
£250,00036 Blackwell House, The Embankment, Nash Mills Wharf, Hemel Hempstead, HP3 9FX
Sold Jan 2025
£315,000
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 £4,747
Floor Area
73 m²
Street avg 64 m²
Habitable Rooms
3 rooms
Street avg 3 rooms
CO₂ Emissions
0.8 t/year
Street avg 1.5 t/year
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Start your researchSimilar properties nearby
A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
£301k
1 Blackwell House, The Embankment, Nash Mills Wharf
HP3 9FX
2 bed2 bath
£270k
1 Apsley Grange
HP3 9SY
2 bed
£258k
1 Barn Close
HP3 9PJ
2 bed1 bath
£455k
1 Barnard Way
HP3 9EX
2 bed1 bath
£175k
1 Basildon Court, Croxley Road, Nash Mills Wharf
HP3 9GY
2 bed1 bath
£373k
1 Butterfly Crescent, Nash Mills Wharf
HP3 9GS
1 bed1 bath
£385k
1 Brereton Court
HP3 9JS
3 bed1 bath
£439k
1 Athelstan Road
HP3 9QE
3 bed
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.
Rail-style transport is unusually close for this postcode.
Crime
211/mo
Falling 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.
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· 07:00 – 23:00
49.8dB
Night-time· 23:00 – 07:00
40.1dB
55 dB
60 dB
65 dB
70 dB
75 dB
80 dB
Defra Road Noise Strategic Mapping, Round 4Common 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.