LL23 is below average for energy efficiency — most homes here have room to improve.
20.5% of homes are rated F or G — above the national average of 2.9%.
Looking at the energy data for LL23, this Gwynedd district scores an average of 54 out of 100, placing it below the national average. Compared to the national average of 67, that puts LL23 below the norm for England and Wales. The most common rating band is D, with 5.3% of homes rated A or B and 53.0% in the C or D bands. Meanwhile, 20.5% of homes sit in the F or G bands — the least efficient categories. In practical terms, a rating of D means many homes here lose more heat than average — potentially adding £200-400 per year to energy bills compared to a C-rated home.
The area is characterised by houses. Around 64% of properties are owner-occupied and 22% are social housing.
There is genuine room for improvement here. If every recommended upgrade were carried out, the average score could climb from 54 to 80 — a 26-point jump that would lift the typical rating to C. That is a substantial gain, suggesting many homes are missing basic efficiency measures. If you live in LL23 and want to reduce your energy bills, start with our guide to loft insulation — it is one of the most cost-effective upgrades you can make.
EPC Rating Distribution
Energy Efficiency Score
Potential score if all improvements made: 80 (rating C)
Recommended Improvements
Government funding may be available for some of these improvements. Check grants →
More data — property types, tenure & fuel
Property Types
Tenure
Main Fuel Types
Frequently asked questions
What is the average EPC rating in LL23?
Homes in LL23 have an average EPC rating of E, scoring 54 out of 100 for energy efficiency. That figure comes from 1,212 certificates issued across the district.
That is below the national average of 67, which means there is real scope to improve energy efficiency here. An E rating suggests many homes here are losing significant amounts of heat — and money — through poor insulation or outdated heating systems.
What percentage of homes in LL23 are rated F or G?
20.5% of homes in LL23 fall into the F or G bands — the lowest energy efficiency ratings. Nationally, the figure is 2.9%.
That means LL23 has a higher-than-average proportion of poorly insulated homes. On the positive side, many of these properties may qualify for free improvements through government schemes like ECO4 or the Great British Insulation Scheme. Landlords should note that F and G rated properties cannot legally be rented out under current MEES rules.