Hen Bost, Bontnewydd, Caernarfon LL55 2UG

Detached house · Built before 1900 · 248 m² · Owner-Occupied · Boiler and radiators, oil

Upgrade Plan

FD for £18,910 · £9,455 a gradeGet upgrade quotes
MeasureGrantNet costSaving / yrPaybackGrade effect
Loft insulation£350£1702.1 yrs+2.6 pts
Low energy lighting£60£163.8 yrs+0.2 pts
Band A condensing boiler£3,000 – £0£2206.8 yrs+3.4 pts
Floor insulation£6,000 – £0£3588.4 yrs+5.5 pts · reaches E
Solar water heating£6,000 – £0£27810.8 yrs+4.3 pts
Solar photovoltaic panels£8,000 – £0£33112.1 yrs+5.1 pts
Solid wall insulation£14,000 – £0£38718.1 yrs+5.9 pts · reaches D

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

£5,194
per year at grade F
£3,434
per year at grade D

The full plan saves £1,760 a year — a 9.3% annual return on £18,910.

Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2015, states £4,136 a year at the prices assumed then. Modelled costs, not a bill.

Sold prices

No sale recorded for this address since 1995.

Llifon Terrace: 2 sales since 1995

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.

2.5
crimes a month
15
in the last 12 months
Violence and sexual offences
most common · 53% of the total

Police.uk street-level data for LSOA W01000054, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.

Llifon Terrace

How this home sits against its street.

4
graded homes
34
average score
E
most common grade
-5.0
this home vs street
Energy data © Crown copyright, EPB Register© HM Land Registry, OGL v3We grade homes, never neighbourhoods.