Gwynfryn, Porthmadog LL49 9PP

Detached house · Built 1967-1975 · 186 m² · Owner-Occupied · Air source heat pump, radiators, electric

Upgrade Plan

CB for £5,400 · £5,400 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Heating controls£350 – £450£854.7 yrs+1.0 pts
Floor insulation£4,000 – £6,000£23521.3 yrs+2.8 pts · reaches B
Solar water heating(optional, beyond B)£4,000 – £6,000£18227.5 yrs+2.2 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

£2,499
per year at grade C
£1,997
per year at grade B

The full plan saves £320 a year — a 5.9% annual return on £5,400.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2024, states £2,467 a year at the prices assumed then. Modelled costs, not a bill.

Sold prices

7 January 2025£470,000
10 December 2009£320,000

Estimated today: £492,495 HPI-indexed estimate, not a valuation

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.

Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.