EPC.Report
D
LL42 Dwyfor Meirionnydd
Gwynedd Rating D Score: 58 / 100

LL42 is below average for energy efficiency — most homes here have room to improve.

12.9% of homes are rated F or G — above the national average of 2.9%.

Data from 979 property assessments shows LL42 averaging 58 out of 100, placing it below the national average. For reference, the England and Wales average is 67 — so LL42 is below that benchmark. The most common rating band is D, with 4.8% of homes rated A or B and 61.4% in the C or D bands. Meanwhile, 12.9% 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.

Walk through LL42 and you will mostly see houses. Flats make up a notable 38% of homes here. Around 67% of properties are owner-occupied and 17% are social housing. Gas central heating is the main fuel source for 72% of homes, which is typical for urban areas across England.

There is genuine room for improvement here. If every recommended upgrade were carried out, the average score could climb from 58 to 78 — a 20-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 LL42 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

A
1 (0.1%)
B
46 (4.7%)
C
248 (25.3%)
D
353 (36.1%)
E
205 (20.9%)
F
83 (8.5%)
G
43 (4.4%)

Energy Efficiency Score

58
LL42 avg
67
National avg
-9 points vs national average

Potential score if all improvements made: 78 (rating C)

Recommended Improvements

Government funding may be available for some of these improvements. Check grants →

More data — property types, tenure & fuel

Property Types

374
Flat
75
Maisonette
468
House
62
Bungalow

Tenure

620
Owner-occupied
152
Private rented
153
Social rented

Main Fuel Types

705
gas
194
electric
58
oil
22
other

Frequently asked questions

What is the average EPC rating in LL42?

Homes in LL42 have an average EPC rating of D, scoring 58 out of 100 for energy efficiency. That figure comes from 979 certificates issued across the district.

That is below the national average of 67, which means there is real scope to improve energy efficiency here. A D rating typically means higher-than-necessary heating bills, especially in older properties without adequate insulation.

What percentage of homes in LL42 are rated F or G?

12.9% of homes in LL42 fall into the F or G bands — the lowest energy efficiency ratings. Nationally, the figure is 2.9%.

That means LL42 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.

See all EPC data for Gwynedd →