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

Estimated value

£311,000

  • Since the 2025 sale (£235,000)+32%
  • Against HP3 9FX's recent median (£285,000)+9%

Newest record on this page: March 2026. Land Registry and EPC registers update monthly, so this page can trail them by 2–3 months.

Learn about this valuation
Habitable rooms
3
From EPC
Floor area
72 m²
775 sq ft
Energy rating
D
Score 59
Council tax
Band D
Tenure
Owner Occupied
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Valuation

About this valuation

How the figure is worked out and what it's based on. If you know this home, you can tell other visitors what you think it's worth.

Our estimate

£311,000

  • Against its 2025 sale (£235,000)+32%
  • Against HP3 9FX's recent median (£285,000)+9%

Your note and figure are shown publicly on this page.

How the estimate is made

The estimate for 15 Blackwell House is modelled from its 72 m² EPC floor area, its 2 recorded sales and recent sales of comparable homes in HP3 9FX. It is an automated estimate, not a survey or mortgage valuation: condition, layout and improvements that aren't on record can move the real figure either way.

What it's based on

  • Floor area

    72 m² from the EPC lodged in March 2026

  • Sales of this home

    2 sales recorded, the latest in 2025

  • Recent sales in HP3 9FX

    5 sales, median £285,000 (2025–2024)

This page or the full report?

DataThis pageFull report
SalesLatest sale shown: October 2025Latest available records, read when you order
ValuationEstimate from the last refreshAnalysed against comparable sales
PlanningNone on this homeFull history, plus nearby schemes
Flood riskNot shownIncluded
Price

Sales history & valuation

Every recorded sale of this home, how its price has moved, and what neighbouring properties have sold for.

Sales timeline

  1. 27 July 2025Most recent

    £235,000

    -28.4%over 9 years

  2. 20 November 2015

    £328,000

Median price across the last 5 sales in HP3 9FX: £285,000 (2025–2024).

Risks

What this page doesn't show

Nothing is flagged from the data on this page, but these checks are only run in the report. The detail, evidence and what to ask about it are in the Risks Report.
  • Flood risk from rivers, sea and surface waterIn report
  • Subsidence and ground-stability signalsIn report
  • Refusals, enforcement and big schemes nearbyIn report

One time fee only - money back guarantee

Overview

About 15 Blackwell House

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

15 Blackwell House is a property in Nash Mills Wharf, Hemel Hempstead, Hemel Hempstead (HP3 9FX). It has a recorded floor area of 72 m² (around 775 sq ft), construction records dating it to 2012 onwards and council tax band D. At 72 m² this is the 24th 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 (59 versus a best of 87). The latest certificate (March 2026) shows a D (score 59), a step below the typical UK home. 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 76). Main heating runs on electricity. This certificate was lodged in the last six months, so the rating reflects current condition.

A recent sale: £235,000 in July 2025. At 72 m² it's 16.1% larger than the typical home in the postcode (62 m² median across 35 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 89% of similar EPCs). Across 2015–2025, sale prices on this property compounded at -3.4% per year. Today's modelled estimate of £311,000 is 32.3% above the 2025 sale price. On a £-per-square-foot basis, the last sale (£303/sq ft) was about 30.2% below the postcode norm.

Before you decide

Everything you need to know about 15 Blackwell House

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

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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.

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

Current Certificate(1 of 2)
Mar 2026

EPC Rating

A
B
C
D
D59
E
F
G
Main Heating
Electric
Main Fuel
Electric
Hot Water
Very Poor
Windows
Average
CO2 Emissions
0.9 t/year
Occupancy
Owner Occupied

Certificate validity

Valid until 30 March 2036

9 years remaining
Planning

Planning history

Applications and permits filed against 15 Blackwell House, The Embankment, Nash Mills Wharf, Hemel Hempstead, HP3 9FX, sourced from the PlanIt planning register.

15 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.

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.

On price per m², 15 Blackwell House runs well behind the street norm.

Price per m²

£3,264

Street avg £4,775

Strongly below

Floor Area

72 m²

Street avg 64 m²

Above

Habitable Rooms

3 rooms

Street avg 3 rooms

On par

CO₂ Emissions

0.9 t/year

Street avg 1.5 t/year

Strongly above
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

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.

Nearest schools

  • Nash Mills Church of England Primary SchoolPrimary355m
  • Belswains Primary SchoolPrimary1.0km
  • Chambersbury Primary SchoolPrimary1.2km
  • Kings Langley Primary SchoolPrimary1.3km

Nearest stops

  • Mill CloseBus stop185m
  • Red Lion LaneBus stop185m
  • Rucklers LaneBus stop190m
  • Doolittle MeadowsBus stop277m

Most reported crime locally

  • Violence & Sexual Offences937 reports34%
  • Anti-social Behaviour630 reports23%
  • Other Theft265 reports10%
  • Criminal Damage & Arson174 reports6%

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
SDL Surveying

Get a survey for this property

Level 3 Building Survey

21st century2nd Floor FlatEPC DNo mains gas

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

From £955 · Includes VAT

Comparables

Similar 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
£289k

1 Canal View House, Lawn Lane

HP3 9HS

£281k

1 Athelstan Mews, Athelstan Road

HP3 9QE

£352k

1 Barnfield

HP3 9QH

£358k

1 Bond Close

HP3 9XU

£270k

1 Apsley Grange

HP3 9SY

2 bed
£361k

1 Bevan Close

HP3 9EZ

£373k

1 Butterfly Crescent, Nash Mills Wharf

HP3 9GS

1 bed1 bath

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Method

How to read this page

Where every figure above comes from, how current it is and what it can't tell you.
Valuation method in detail
How the estimate is made
The estimate for 15 Blackwell House is modelled from its 72 m² EPC floor area, its 2 recorded sales and recent sales of comparable homes in HP3 9FX. It is an automated estimate, not a survey or mortgage valuation: condition, layout and improvements that aren't on record can move the real figure either way.
Where sold prices come from
Sold prices are HM Land Registry Price Paid Data, which covers residential sales in England and Wales since 1995. 2 sales are recorded for 15 Blackwell House. Sales normally appear two to three months after completion, so the most recent ones take time to show up anywhere.
Reading the EPC
Energy Performance Certificates rate homes from A (most efficient) to G and last 10 years. The latest one for 15 Blackwell House was lodged in March 2026 at band D and is valid until March 2036. 2 certificates are on record, which shows how the home has changed.
Planning records
Planning applications are collected from local authority registers through PlanIt. None is matched to 15 Blackwell House. Councils sometimes file applications under a different address format, and applications on neighbouring land aren't listed here; the report covers both.
Area figures
Crime is police-recorded street-level data over the last 13 months, which places each incident at an approximate point. The 18 schools and 30 stops listed are measured in a straight line from HP3 9FX, not by walking route. Road noise is Defra's strategic noise modelling, averaged across the postcode.
Council tax band
15 Blackwell House is in council tax band D. Bands are set by the Valuation Office Agency from historic values (1 April 1991 in England, 1 April 2003 in Wales), not today's price; the amount you pay depends on the council's rate for the band.
FAQ

Common questions

The questions buyers, sellers and homeowners most often ask about 15 Blackwell House, The Embankment, Nash Mills Wharf, Hemel Hempstead, HP3 9FX. Each answer is also embedded as structured data for search engines.

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