What is the average EPC rating in Gwynedd?

The analysed certificates in Gwynedd have an average EPC rating of D, with an average efficiency score of 58 out of 100.

How many properties does the Gwynedd analysis represent?

The 2020–2025 analysis contains 20,617 certificates linked to 19,518 distinct property references. A property may have more than one certificate.

Can EPCScore show the certificate for a specific home in Gwynedd?

No. EPCScore publishes aggregated area statistics. Use the official GOV.UK Energy Performance of Buildings Register to find an individual certificate.

Local authority energy-performance profile

Gwynedd EPC ratings and energy costs

Understand how homes in Gwynedd score, what certificate-estimated energy costs look like and how much improvement the recorded recommendations suggest.

Compare with another area →

Average EPC

D 58

10.5 points below analysed national average

Rated C or above

32.1%

of analysed certificates

Potential uplift

+24

average score points

Properties represented

20K

from 21K certificates

At a glance

What the data says about Gwynedd

32.1%

rated A–C

35.9%

rated E–G

£1,592

certificate-estimated annual cost

Cost figures are averages of estimates recorded on EPCs at different dates. They are useful for comparing areas, but they are not a forecast of a current household bill.

Latest official local-authority table

Updated through 30 June 2026

58,824

domestic EPC lodgements since 2008

26.2%

rated C or above

42.9%

rated E, F or G

The current MHCLG live table counts certificate lodgements, not unique homes. It complements the more detailed 2020–2025 EPCScore analysis below.

Housing market context — May 2026

Average property price

£203,619

Annual change

+2.5%

Context

Official UK HPI local-authority average

detached£315,747

semi-detached£209,692

terraced£160,432

flat£114,979

UK HPI figures are provisional and can be revised. They describe the whole local housing market; EPCScore does not infer that EPC ratings caused local price levels or changes. View the official UK HPI ↗

Average EPC score in Gwynedd

A92+

2.3%

B81–91

4.5%

C69–80

25.2%

D55–68

32.0%

E39–54

21.7%

F21–38

9.8%

G1–20

4.3%

EPC band distribution in Gwynedd

4812.3%

9314.5%

25.2%

5,196

32.0%

6,602

21.7%

4,481

9.8%

2,030

8964.3%

Certificate-estimated energy costs

Cost Type	Gwynedd	National Avg	Difference
Heating	£1,241/yr	£782/yr	▲ £459
Hot water	£249/yr	£184/yr	▲ £65
Lighting	£102/yr	£95/yr	▲ £7
Total	£1,592/yr	£1,061/yr	▲ £531

These values come from certificate assessments and reflect standardised occupancy assumptions and energy prices used when each EPC was produced. They are not live tariffs.

Property types in the dataset

House

14,35169.6%

Flat

2,92014.2%

Bungalow

2,91214.1%

Maisonette

4232.1%

Park home

110.1%

Main heating fuel

Mains gas

9,80347.7%

Electric

5,28225.7%

Oil

2,94114.3%

LPG

1,5707.6%

Other

9384.6%

Carbon emissions and improvement potential

5 t

current annual CO₂ estimate

2.3 t

potential annual estimate

93 m²

average floor area

When the represented homes were built

Pre-1900

38%

1900–1929

11%

1930–1949

1950–1966

11%

1967–1975

1976–1982

1983–1990

1991–1995

1996–2002

2003–2006

2007–2011

2012+

Average EPC score over time

2020: 54
2021: 54
2022: 55
2023: 59
2024: 60
2025: 63

What to do next

Find one property's EPC ↗

Use the official register for an address-level certificate.

Plan sensible improvements →

Read recommendations in the right order before spending.

Compare another area →

Put two postcode districts side by side.

Check the methodology →

Understand coverage, dates and limitations.