Caernarfon · LL54
Plumbing compliance check in LL54 (Caernarfon)? We'll point you the right way.
Covering Caernarfon, Clynnogfawr, Llanaelhaearn, Llandwrog, Pontllyfni, Saron, Trefor, Llanllyfni, Nantlle, Penygroes, Rhyd Ddu, Talysarn, Bontnewydd, Carmel, Dinas, Groeslon, Rhosgadfan, Rhostryfan, including Canol Tref Caernarfon, Clynnog, Dolbenmaen. Find plumbers nearby.
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LL54 (Caernarfon) in a nutshell
LL54 covers Caernarfon, Clynnogfawr, Llanaelhaearn, Llandwrog, Pontllyfni, Saron, Trefor, Llanllyfni, Nantlle, Penygroes, Rhyd Ddu, Talysarn, Bontnewydd, Carmel, Dinas, Groeslon, Rhosgadfan, Rhostryfan, in Gwynedd. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.
Local tips for LL54
Gwynedd council area
LL54 is in Gwynedd's area. Some councils run their own landlord licensing, so it's worth checking theirs.
Where's this from?
postcodes.io (ONSPD) local authorityGive your full postcode
LL54 stretches across Canol Tref Caernarfon, Clynnog, Dolbenmaen and more, so give your full postcode, not just 'LL54', when you ask for quotes.
Where's this from?
postcodes.io (ONSPD) wardsOlder terraces, older pipes
Caernarfon has lots of terraced homes. In older ones, ask the plumber to look at shared supply pipes and any old tanks in the loft.
Where's this from?
ONS Census 2021, Caernarfon: 34.9% terracedWales landlord rules: quick version
- Fit to live in: keep water, drainage and heating in repair.
- Legionella: assess the risk.
More detail on the Caernarfon page. Always double-check on GOV.WALES.
Next door to LL54
Frequently asked questions
Which areas does LL54 cover?
LL54 (Caernarfon, Clynnogfawr, Llanaelhaearn, Llandwrog, Pontllyfni, Saron, Trefor, Llanllyfni, Nantlle, Penygroes, Rhyd Ddu, Talysarn, Bontnewydd, Carmel, Dinas, Groeslon, Rhosgadfan, Rhostryfan) includes the wards of Canol Tref Caernarfon, Clynnog, Dolbenmaen, Llanllyfni, Llanwnda, Pen-y-groes, Tryfan, Waunfawr, Y Bontnewydd, Y Groeslon, Yr Eifl (ONS Postcode Directory via postcodes.io).
Which postcode districts are next to LL54?
Neighbouring districts include LL51 (Garndolbenmaen), LL55 (Caernarfon), LL61 (Llanfairpwllgwyngyll), LL60 (Gaerwen), LL52 (Criccieth) (ONS Postcode Directory via Doogal). A pro covering LL54 may well cover these too, so it's worth asking.
How many homes are in LL54?
About 4,863 households and 11,380 residents at the 2011 Census, across 522 active postcodes (Doogal / ONS Postcode Directory).
Which council area is LL54 in?
LL54 sits in Gwynedd (postcodes.io). Parliamentary constituency: Dwyfor Meirionnydd.
📊 The numbers behind this page
- Postcode district
- LL54 1
- Areas covered
- Caernarfon, Clynnogfawr, Llanaelhaearn, Llandwrog, Pontllyfni, Saron, Trefor, Llanllyfni, Nantlle, Penygroes, Rhyd Ddu, Talysarn, Bontnewydd, Carmel, Dinas, Groeslon, Rhosgadfan, Rhostryfan 2
- Active postcodes
- 522 3
- Households (2011 Census, via Doogal)
- 4,863 2
- Population (2011 Census, via Doogal)
- 11,380 2
- Electoral wards
- Canol Tref Caernarfon, Clynnog, Dolbenmaen, Llanllyfni, Llanwnda, Pen-y-groes, Tryfan, Waunfawr … 4
- Parliamentary constituencies
- Dwyfor Meirionnydd 4
- Local authority
- Gwynedd 4
- Households in converted/shared houses (Caernarfon built-up area)
- 1.8% 5
- ONS Postcode Directory
- Doogal
- Doogal / ONSPD
- postcodes.io
- ONS Census 2021
Made with open data. See where it all comes from. Updated 26 October 2026.