23 Sylvandale, Welwyn Garden City AL7 2HS

Detached house · 1983-1990 · Boiler and radiators, mains gas

Upgrade Plan

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MeasureGrantNet costSaving / yrPaybackGrade effect
Low energy lighting(optional, beyond C)£30 – £75typical£150+ yrs+0.1 pts
Solar water heating(optional, beyond C)£5,000typical£1150+ yrs+0.9 pts
Solar photovoltaic panels(optional, beyond C)£4,500 – £9,000typical£1350+ yrs+1.1 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

£545
per year at grade C
£521
per year at grade C

Energy costs as modelled on the certificate, not a bill. This fuel has too few recent certificates to restate at today's prices.

Sold prices

7 June 2013£310,000
17 September 2009£248,000
7 March 2005£249,000

Estimated today: £530,889 HPI-indexed estimate, not a valuation

Sylvandale: 97 sales since 1995 · £525,868 average over 10 years

Schools nearby

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

SchoolPhaseDistanceProgress
Watchlytes Primary SchoolPrimary0.4 mi
Springmead Primary SchoolPrimary0.6 mi
Swallow Dell Primary and Nursery SchoolPrimary0.8 mi
Ridgeway AcademySecondary0.7 miProgress 8 -0.47 · below average (2023/24)
Stanborough SchoolSecondary2.3 miProgress 8 +0.18 · average (2023/24)
Monk's Walk SchoolSecondary2.6 miProgress 8 +0.24 · 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.

5.6
crimes a month
39
in the last 12 months
Vehicle crime
most common · 26% of the total

Police.uk street-level data for LSOA E01023953, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.

Sylvandale

How this home sits against its street.

41
graded homes
67.2
average score
C
most common grade
+2.8
this home vs street
Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.