Local authority
EPC ratings in Gwynedd
Explore EPC ratings for properties in Gwynedd. 40,001 properties have been assessed, with an average rating of D. Browse districts below to see local energy efficiency trends, or search for a specific address to view detailed EPC data. The most common improvement recommended across Gwynedd is solar photovoltaic panels, 2.5 kwp, followed by solar water heating.
On average, 27% of EPC-rated homes in Gwynedd are band A-C and 73% are band D-G, broadly below the England & Wales average.
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Percentage of properties in each EPC band across Gwynedd.
District breakdown
23 districts in this authority.
LL23
Properties: 1,232
Band A-C
25%
Band D-G
75%
LL35
Properties: 600
Band A-C
21%
Band D-G
79%
LL36
Properties: 1,799
Band A-C
29%
Band D-G
71%
LL37
Properties: 216
Band A-C
12%
Band D-G
88%
LL38
Properties: 316
Band A-C
7%
Band D-G
93%
LL39
Properties: 78
Band A-C
5%
Band D-G
95%
LL40
Properties: 1,445
Band A-C
26%
Band D-G
74%
LL41
Properties: 2,137
Band A-C
21%
Band D-G
79%
LL42
Properties: 985
Band A-C
29%
Band D-G
71%
LL43
Properties: 159
Band A-C
8%
Band D-G
92%
LL44
Properties: 373
Band A-C
14%
Band D-G
86%
LL45
Properties: 222
Band A-C
12%
Band D-G
88%
LL46
Properties: 766
Band A-C
14%
Band D-G
86%
LL47
Properties: 207
Band A-C
4%
Band D-G
96%
LL48
Properties: 799
Band A-C
25%
Band D-G
75%
LL49
Properties: 1,598
Band A-C
28%
Band D-G
72%
LL51
Properties: 221
Band A-C
11%
Band D-G
89%
LL52
Properties: 970
Band A-C
28%
Band D-G
72%
LL53
Properties: 5,997
Band A-C
19%
Band D-G
81%
LL54
Properties: 3,498
Band A-C
20%
Band D-G
80%
LL55
Properties: 6,789
Band A-C
30%
Band D-G
70%
LL56
Properties: 890
Band A-C
41%
Band D-G
59%
LL57
Properties: 7,992
Band A-C
40%
Band D-G
60%
Common improvements in Gwynedd
Top recommended actions across districts in this authority.
- 1
Solar photovoltaic panels, 2.5 kWp
41168 occurrences
- 2
Solar water heating
37642 occurrences
- 3
Low energy lighting for all fixed outlets
21942 occurrences
- 4
Floor insulation (solid floor)
20819 occurrences
- 5
Internal or external wall insulation
19471 occurrences
Check a property in this area
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For journalists, researchers and local groups
Use these statistics
Free to reuse with a link to this page. Figures cover homes with an EPC on the official register, counted by their latest certificate. Homes that have never had an EPC are not included, so the figures describe certified homes, not every home in Gwynedd.
Summary
In Gwynedd, 27.2% of homes with an EPC are rated band C or above, based on the latest certificate for 40,001 homes on the official register (statistics updated June 2026). That is 20.5 percentage points below the England and Wales figure of 47.7%.
Citation
EPC Advisor (2026). EPC ratings in Gwynedd. Statistics updated June 2026. Analysis of the MHCLG Get Energy Performance Data register (Open Government Licence v3.0). https://epcadvisor.co.uk/browse/gwynedd
- Band C or above:
- a current rating of A, B or C.
- Homes counted:
- 40,001
- Statistics updated:
- June 2026
- Source:
- The MHCLG Get Energy Performance Data register, published under the Open Government Licence v3.0. How we calculate these figures · All EPC data downloads