9 Park Mount, Harpenden AL5 3AS

Semi-Detached house · Built 1900-1929 · 100 m² · Boiler and radiators, mains gas

Upgrade Plan

ED for £14,385 · £14,385 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Low energy lighting£20 – £50typical£313.8 yrs+0.1 pts
Band A condensing boiler£2,600typical£3650+ yrs+1.1 pts
Solar water heating£5,000typical£4550+ yrs+1.4 pts
Solar photovoltaic panels£4,500 – £9,000typical£5450+ yrs+1.6 pts · reaches D
Solid wall insulation(optional, beyond D)£9,000typical£6350+ yrs+1.9 pts

Grants verified 20 August 2026. Costs are the register’s indicative ranges, except where marked typical, which this certificate did not price and which are taken instead from comparable homes of the same type. Savings are restated at the fuel prices assumed in July 2026. Points per measure are estimated from 19.9 million certificates and rescaled to this home’s own certificate delta; the total is the register’s figure.

Running costs

£1,854
per year at grade E
£1,654
per year at grade D

The full plan saves £137 a year — a 1.0% annual return on £14,385.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2011, states £1,187 a year at the prices assumed then. Modelled costs, not a bill.

Sold prices

22 September 2017£635,000
24 August 2011£450,000
18 December 2005£337,500
8 March 2002£195,000

Estimated today: £762,000 HPI-indexed estimate, not a valuation

Park Mount: 162 sales since 1995 · £807,593 average over 10 years

Schools nearby

The schools’ own performance — Progress 8 shows value added, not just raw results.

SchoolPhaseDistanceProgress
Roundwood Primary SchoolPrimary0.3 mi
St Nicholas CofE VA Primary SchoolPrimary0.6 mi
Wood End SchoolPrimary0.7 mi
Roundwood Park SchoolSecondary0.3 miProgress 8 +0.79 · well above average (2023/24)
St George's SchoolSecondary0.6 miProgress 8 +0.65 · well above average (2023/24)
Sir John Lawes SchoolSecondary0.9 miProgress 8 +0.79 · well above average (2023/24)

Schools from the DfE register, performance from the KS4 performance tables. Progress 8 is a GCSE measure, so primaries have none. Distance is straight-line from the postcode, not a catchment: admission is decided by the school, not by us.

Area context

Police-recorded crime for the wider neighbourhood, not this address. We grade homes, never neighbourhoods — so this is reported as a count, not a rating.

6.4
crimes a month
45
in the last 12 months
Violence and sexual offences
most common · 31% of the total

Police.uk street-level data for LSOA E01023690, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.

Park Mount

How this home sits against its street.

56
graded homes
62.7
average score
D
most common grade
-11.7
this home vs street
Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.