13 Chapel Street, Porthmadog LL49 9DS

End-Terrace house · Built before 1900 · 107 m² · Owner-Occupied · Boiler and radiators, mains gas

Upgrade Plan

EB for £18,700 · £6,233 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Room-in-roof insulation£2,700 – £700£2068.2 yrs+6.8 pts · reaches D
Cavity wall insulation£1,500 – £500£1128.9 yrs+3.7 pts
Floor insulation£6,000 – £0£15020.1 yrs+4.9 pts
Solar photovoltaic panels£5,500 – £500£13821.7 yrs+4.5 pts · reaches C
Solar water heating£6,000 – £0£11625.8 yrs+3.8 pts
Solid wall insulation£14,000 – £0£16243.3 yrs+5.3 pts · reaches B

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

£2,044
per year at grade E
£1,160
per year at grade B

The full plan saves £884 a year — a 4.7% annual return on £18,700.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2019, states £1,285 a year at the prices assumed then. Modelled costs, not a bill.

Sold prices

16 August 2019£130,000
30 June 2011£60,000
6 July 2004£96,500
26 June 2003£72,500
14 October 2002£50,500
10 March 1999£34,000

Estimated today: £178,986 HPI-indexed estimate, not a valuation

Chapel Street: 90 sales since 1995 · £122,728 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.

18
crimes a month
198
in the last 12 months
Violence and sexual offences
most common · 37% of the total

Police.uk street-level data for LSOA W01000105, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.

Chapel Street

How this home sits against its street.

46
graded homes
57
average score
D
most common grade
-4.0
this home vs street
Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.