12 Cornfield Close, Llanishen, Cardiff CF14 5HS

Semi-Detached house · Built 1967-1975 · 98 m² · Owner-Occupied · Boiler and radiators, mains gas

Upgrade Plan

CB for £10,500 · £10,500 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Cavity wall insulation£500 – £1,500£5617.9 yrs+3.5 pts
Solar photovoltaic panels£3,500 – £5,500£6950+ yrs+4.3 pts
Floor insulation£4,000 – £6,000£7550+ yrs+4.6 pts · reaches B
Solar water heating(optional, beyond B)£4,000 – £6,000£5850+ yrs+3.6 pts

Grants verified 20 August 2026. Costs are the register’s indicative ranges. 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

£1,221
per year at grade C
£963
per year at grade B

The full plan saves £200 a year — a 1.9% annual return on £10,500.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2021, states £757 a year at the prices assumed then. Modelled costs, not a bill.

Sold prices

12 November 2021£315,000
22 August 1997£64,500

Estimated today: £366,081 HPI-indexed estimate, not a valuation

Cornfield Close: 29 sales since 1995 · £277,444 average over 10 years

Schools nearby

The DfE register covers England. Welsh schools are held in a separate Welsh Government register, which we have not ingested yet.

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.

4.4
crimes a month
22
in the last 12 months
Violence and sexual offences
most common · 32% of the total

Police.uk street-level data for LSOA W01001798, to 2026-05. An LSOA holds about 1,500 people, so this covers far more than one street.

Cornfield Close

How this home sits against its street.

14
graded homes
63.6
average score
D
most common grade
+5.4
this home vs street
Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.