30 Matthysens Way, St. Mellons, Cardiff CF3 0PS

Semi-Detached house · Built 1996-2002 · 67 m² · Owner-Occupied · Boiler and radiators, mains gas

Upgrade Plan

C → B for £4,950 · £4,950 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Party wall insulation—£300 – £600£1923.5 yrs+3.4 pts
Solar photovoltaic panels—£3,500 – £5,500£3350+ yrs+5.8 pts · reaches B
Solar water heating(optional, beyond B)—£4,000 – £6,000£2750+ yrs+4.8 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

£817
per year at grade C
£738
per year at grade B

The full plan saves £52 a year — a 1.1% annual return on £4,950.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2020, states £523 a year at the prices assumed then. Modelled costs, not a bill.

Sold prices

16 October 2020£200,000
22 September 2014£169,950
30 June 2005£135,000
19 April 1999£66,500

Estimated today: £254,501 HPI-indexed estimate, not a valuation

Matthysens Way: 261 sales since 1995 · £224,528 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.

Matthysens Way

How this home sits against its street.

78
graded homes
70.3
average score
C
most common grade
+2.7
this home vs street
Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.