Ruthin · LL21
Gas safety certificate in LL21 (Corwen)? We'll point you the right way.
Covering Corwen, Cynwyd, Glanrafon, Glasfryn, Llandrillo, Llangwm, Maerdy, Ty Nant, Betws Gwerfil Goch, Bryneglwys, Carrog, Cerrigydrudion, Clawdd Poncen, Derwen, Glyndyfrdwy, Gwyddelwern, Llanfihangel Glyn Myfyr, Llidiart-y-Parc, Melin-y-Wig, including Edeirnion, Efenechdyd, Llandderfel. Find Gas Safe registered engineers nearby.
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Request a gas safety certificate in LL21 (Corwen)
No gas safety engineer listed for LL21 (Corwen) yet. Tell us what you need and we'll find you a registered gas safety engineer, free.
Request a gas safety certificate in LL21 (Corwen)
How to check a gas safety engineer is registered: see the Ruthin page.
LL21 (Corwen) in a nutshell
LL21 covers Corwen, Cynwyd, Glanrafon, Glasfryn, Llandrillo, Llangwm, Maerdy, Ty Nant, Betws Gwerfil Goch, Bryneglwys, Carrog, Cerrigydrudion, Clawdd Poncen, Derwen, Glyndyfrdwy, Gwyddelwern, Llanfihangel Glyn Myfyr, Llidiart-y-Parc, Melin-y-Wig, in Conwy and Denbighshire and Gwynedd. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.
Local tips for LL21
Two councils in one district
LL21 is split between Conwy and Denbighshire and Gwynedd. Some councils run their own landlord licensing, so check which one your home is in.
Where's this from?
postcodes.io (ONSPD) local authorityGive your full postcode
LL21 stretches across Edeirnion, Efenechdyd, Llandderfel and more, so give your full postcode, not just 'LL21', when you ask for quotes.
Where's this from?
postcodes.io (ONSPD) wardsMostly mains gas round here
Most homes in Ruthin run on mains gas, so a standard boiler-and-hob check is what most people need.
Where's this from?
ONS Census 2021, Ruthin: 80.2% mains gas onlyWales landlord rules: quick version
- Every year: a gas safety check by a Gas Safe registered engineer.
- CO alarm: needed where there's a gas, oil or solid fuel appliance.
- Register: with Rent Smart Wales.
More detail on the Ruthin page. Always double-check on GOV.WALES.
Next door to LL21
Frequently asked questions
Which areas does LL21 cover?
LL21 (Corwen, Cynwyd, Glanrafon, Glasfryn, Llandrillo, Llangwm, Maerdy, Ty Nant, Betws Gwerfil Goch, Bryneglwys, Carrog, Cerrigydrudion, Clawdd Poncen, Derwen, Glyndyfrdwy, Gwyddelwern, Llanfihangel Glyn Myfyr, Llidiart-y-Parc, Melin-y-Wig) includes the wards of Edeirnion, Efenechdyd, Llandderfel, Llanfair Dyffryn Clwyd Gwyddelwern, Uwch Aled (ONS Postcode Directory via postcodes.io).
Which postcode districts are next to LL21?
Neighbouring districts include LL15 (Ruthin), LL16 (Denbigh), LL20 (Froncysyllte), LL23 (Bala), LL17 (St. Asaph) (ONS Postcode Directory via Doogal). A pro covering LL21 may well cover these too, so it's worth asking.
How many homes are in LL21?
About 2,756 households and 6,442 residents at the 2011 Census, across 368 active postcodes (Doogal / ONS Postcode Directory).
Which council area is LL21 in?
LL21 sits in Conwy, Denbighshire, Gwynedd (postcodes.io). Parliamentary constituency: Bangor Aberconwy, Clwyd East, Dwyfor Meirionnydd.
📊 The numbers behind this page
- Postcode district
- LL21 1
- Areas covered
- Corwen, Cynwyd, Glanrafon, Glasfryn, Llandrillo, Llangwm, Maerdy, Ty Nant, Betws Gwerfil Goch, Bryneglwys, Carrog, Cerrigydrudion, Clawdd Poncen, Derwen, Glyndyfrdwy, Gwyddelwern, Llanfihangel Glyn Myfyr, Llidiart-y-Parc, Melin-y-Wig 2
- Active postcodes
- 368 3
- Households (2011 Census, via Doogal)
- 2,756 2
- Population (2011 Census, via Doogal)
- 6,442 2
- Electoral wards
- Edeirnion, Efenechdyd, Llandderfel, Llanfair Dyffryn Clwyd Gwyddelwern, Uwch Aled 4
- Parliamentary constituencies
- Bangor Aberconwy, Clwyd East, Dwyfor Meirionnydd 4
- Local authority
- Conwy, Denbighshire, Gwynedd 4
- Households heated by mains gas only (Ruthin built-up area)
- 80.2% 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.