Will your Gwynedd rental pass EPC C by 2030?

4,406 of 5,853 privately rented homes in Gwynedd are below EPC C, 75% of the local rental market. They must be upgraded by 1 October 2030.

How Gwynedd compares

Well above average

A bigger share of Gwynedd's rented homes fall short than in most of England and Wales.

Best councils Worst councils

75% of rented homes here are below EPC C, against 53% across England and Wales. That ranks Gwynedd 3 of 318 councils by the share needing work.

Every band in Gwynedd

A 17

B 101

C 1,329

C is the line. Everything below it must be upgraded

D 2,329

E 1,543

F 343

G 191

Of 5,853 privately rented homes with a current certificate.

How many can actually reach C?

4,060 of the 4,406 sub-C rentals in Gwynedd, 92% of them, already have a potential rating of C or better on their current certificate. That is the assessor's own estimate of what the property would reach if the recommended measures were installed.

Landlords are required to spend up to £10,000 per property. Above that, an exemption may apply.

The transitional rule

An EPC rated C or higher on the existing Energy Efficiency Rating, issued before 1 October 2029, counts as compliant until that certificate expires.

Source: Transitional rule. Verified 21 September 2026.

Local housing stock

All tenures in Gwynedd, from properties with a current certificate.
Privately rented	5,853
Socially rented	6,770
Owner occupied	21,692
Median floor area	85 m²

Postcode districts in Gwynedd

Districts that sit mostly or wholly inside Gwynedd.

District	Post town	Rented	Below C	Share
LL57	Bangor	1,907	1,206	63%
LL53	Pwllheli	839	736	88%
LL55	Caernarfon	798	590	74%
LL54	Caernarfon	360	291	81%
SY20	Machynlleth	282	260	92%
LL36	Tywyn	249	191	77%
LL41	Blaenau Ffestiniog	226	191	85%
LL33	Llanfairfechan	197	157	80%
LL40	Dolgellau	178	150	84%
LL23	Bala	175	143	82%
LL56	Y Felinheli	193	125	65%
LL49	Porthmadog	179	124	69%
LL42	Barmouth	155	121	78%
LL52	Criccieth	120	99	83%
LL48	Penrhyndeudraeth	104	91	88%
LL46	Harlech	73	69	95%