Barnard Castle · DL12
Gas safety certificate in DL12 (Barnard Castle)? We'll point you the right way.
Covering Barnard Castle, Bowes, Middleton-in-Teesdale, including Eden and Lyvennet Vale, Lower Teesdale, North Richmondshire. Find Gas Safe registered engineers nearby.
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DL12 (Barnard Castle) in a nutshell
DL12 covers Barnard Castle, Bowes, Middleton-in-Teesdale, in County Durham and North Yorkshire and Westmorland and Furness. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.
Local tips for DL12
Two councils in one district
DL12 is split between County Durham and North Yorkshire and Westmorland and Furness. 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
DL12 stretches across Barnard Castle, Eden and Lyvennet Vale, Lower Teesdale and more, so give your full postcode, not just 'DL12', when you ask for quotes.
Where's this from?
postcodes.io (ONSPD) wardsMostly mains gas round here
Most homes in Barnard Castle run on mains gas, so a standard boiler-and-hob check is what most people need.
Where's this from?
ONS Census 2021, Barnard Castle: 80.2% mains gas onlyEngland landlord rules: quick version
- Every year: a check by a Gas Safe registered engineer.
- Within 28 days: give your tenants a copy (new tenants get it before they move in).
- Keep it: hang on to records for at least 2 years.
Always double-check on GOV.UK.
Next door to DL12
Frequently asked questions
Which areas does DL12 cover?
DL12 (Barnard Castle, Bowes, Middleton-in-Teesdale) includes the wards of Barnard Castle, Eden and Lyvennet Vale, Lower Teesdale, North Richmondshire, Upper Teesdale (ONS Postcode Directory via postcodes.io).
Which postcode districts are next to DL12?
Neighbouring districts include DL13 (Stanhope), DL11 (Swaledale), DL14 (Bishop Auckland), NE44 (Riding Mill), DL15 (Crook) (ONS Postcode Directory via Doogal). A pro covering DL12 may well cover these too, so it's worth asking.
How many homes are in DL12?
About 5,434 households and 12,515 residents at the 2011 Census, across 726 active postcodes (Doogal / ONS Postcode Directory).
Which council area is DL12 in?
DL12 sits in County Durham, North Yorkshire, Westmorland and Furness (postcodes.io). Parliamentary constituency: Bishop Auckland, Richmond and Northallerton, Westmorland and Lonsdale.
📊 The numbers behind this page
- Postcode district
- DL12 1
- Areas covered
- Barnard Castle, Bowes, Middleton-in-Teesdale 2
- Active postcodes
- 726 3
- Households (2011 Census, via Doogal)
- 5,434 2
- Population (2011 Census, via Doogal)
- 12,515 2
- Electoral wards
- Barnard Castle, Eden and Lyvennet Vale, Lower Teesdale, North Richmondshire, Upper Teesdale 4
- Parliamentary constituencies
- Bishop Auckland, Richmond and Northallerton, Westmorland and Lonsdale 4
- Local authority
- County Durham, North Yorkshire, Westmorland and Furness 4
- Households heated by mains gas only (Barnard Castle 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.