DL12 postcode area guide — County Durham
House prices, crime, broadband speeds, mobile signal, schools and demographics for the DL12 postcode district in County Durham — every official dataset on one page.
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Where is DL12?
Broadband & internet speeds in DL12
Strong coverage
Superfast (30Mb+)
71.7%
Ultrafast (300Mb+)
45.2%
Gigabit-capable
45.2%
Below USO (10Mb)
4.9%
Broadband availability in the DL12 postcode district (County Durham) is Strong — superfast is near-universal and gigabit is rolling out. Across the 722 postcodes Ofcom measures in DL12, superfast broadband (30 Mbit/s or faster) reaches 71.7% of premises and gigabit-capable lines are available to 45.2%.
Around 4.9% of premises in DL12 fall below the Universal Service Obligation (a minimum of 10 Mbit/s download and 1 Mbit/s upload), so the overwhelming majority of homes and businesses here can already order a decent fixed line. For a business that depends on its connection, the figures that matter most are gigabit and full-fibre availability — the symmetric, low-contention services we quote leased lines and FTTP against.
Sample postcodes in DL12
| Postcode | Superfast | Gigabit |
|---|---|---|
| DL12 0AA | 100% | 100% |
| DL12 0AB | 100% | 75% |
| DL12 0AD | 100% | 0% |
| DL12 0AE | 100% | 0% |
| DL12 0AF | 0% | 0% |
| DL12 0AG | 100% | 55.6% |
| DL12 0AH | 100% | 18.5% |
| DL12 0AJ | 100% | 75% |
| DL12 0AL | 85.7% | 42.9% |
| DL12 0AN | 100% | 57.1% |
Run a speed test to see what you're actually getting, or check your exact postcode.
Mobile signal around County Durham
Ofcom's coverage model for the wider County Durham district (269,279 premises):
4G indoors — all networks
86.8%
4G outdoors — all networks
99.2%
5G outdoors — all networks
39.9%
Voice indoors — all networks
88.9%
Signal varies street by street — use the mobile coverage checker to compare EE, O2, Three and Vodafone at an exact postcode.
House prices in DL12
Based on 132 sales registered with HM Land Registry in the last 12 months, the median sold price in DL12 is £235,000, down 6.0% on the previous year (£250,000).
Detached
£330,000
38 sales
Semi-detached
£225,000
33 sales
Terraced
£178,000
38 sales
Flat / maisonette
£85,000
8 sales
Latest recorded sales in DL12
| Date | Price | Type | Street | Postcode |
|---|---|---|---|---|
| 12 May 2026 | £213,000 | Flat | Thorngate | DL12 8QB |
| 12 May 2026 | £410,000 | Terraced | Montalbo Road | DL12 8BP |
| 30 Apr 2026 | £255,000 | Detached | Ullathorne Rise | DL12 9BQ |
| 29 Apr 2026 | £382,000 | Detached | Ashtree Drive | DL12 8NZ |
| 27 Apr 2026 | £135,000 | Semi-detached | Greta Road | DL12 8LJ |
| 24 Apr 2026 | £180,000 | Terraced | Grange Terrace | DL12 8UY |
| 8 Apr 2026 | £325,000 | Detached | DL12 0TY | |
| 2 Apr 2026 | £360,000 | Detached | Market Place | DL12 8NE |
| 1 Apr 2026 | £150,000 | Terraced | Churchill Road | DL12 8LL |
| 27 Mar 2026 | £265,000 | Semi-detached | Hesley Rise | DL12 8RE |
Contains HM Land Registry data © Crown copyright and database right 2026, licensed under the Open Government Licence v3.0.
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Who lives here? County Durham demographics
Census 2021 figures for the wider County Durham district (522,068 residents, 234,764 households):
| Age profile | |
|---|---|
| Under 15 | 16.9% |
| 15–29 | 22.7% |
| 30–44 | 17.5% |
| 45–64 | 21.6% |
| 65+ | 21.3% |
| Housing tenure | |
|---|---|
| Owner-occupied | 62.5% |
| Private rented | 17.2% |
| Social rented | 10.6% |
Source: ONS Census 2021 (district level — the finest openly licensed cut we republish). © Crown copyright, OGL v3.0.
Schools in and around DL12
| School | Phase | Ages | Pupils | Postcode |
|---|---|---|---|---|
| Teesdale School and Sixth Form | Secondary | 11–18 | 684 | DL12 8HH |
| Barnard Castle School | Not applicable | 4–19 | 558 | DL12 8UN |
| Montalbo Nursery & Primary School | Primary | 3–11 | 240 | DL12 8TN |
| Green Lane Church of England Primary School | Primary | 3–11 | 188 | DL12 8LG |
| St Mary's Catholic Primary School, Barnard Castle | Primary | 3–11 | 103 | DL12 8JR |
| Middleton-In-Teesdale Academy | Primary | 3–11 | 73 | DL12 0TG |
| Cotherstone Primary School | Primary | 3–11 | 66 | DL12 9QB |
| Bowes Hutchinson's CofE (Aided) School | Primary | 2–11 | 39 | DL12 9LG |
Source: DfE Get Information about Schools (England & Wales). Check Ofsted report cards for inspection detail — headline one-word grades were retired in 2024.
Food hygiene ratings in DL12
178 rated food businesses operate in DL12. 131 hold the top rating of 5, 25 are rated 4, and 1 are rated 2 or below.
Among the 5-rated: Abbeyfield House, Anchor Hanover - The Manor House, Andalucia, Auction Mart Cafe, Auction Mart Cafe.
Source: Food Standards Agency, food hygiene ratings (FHRS) open data.
Energy performance (EPC) in DL12
From a sample of 47 Energy Performance Certificates across 11 DL12 postcodes, the most common rating is band C (average band D). 34% of sampled homes are rated C or better.
Band B
2%
Band C
32%
Band D
26%
Band E
21%
Band F
15%
Band G
4%
Source: MHCLG Energy Performance of Buildings Data (England & Wales), sampled at postcode level and refreshed monthly. Individual certificates are on each postcode’s page.
Phone area codes for County Durham
Landlines around DL12 typically use:
Had a call from an unknown number? Use our free UK phone number checker to see who called.
What's it like living in DL12?
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How would you rate living in DL12 (County Durham)?
Moving to DL12? Sort your connectivity first
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Postcodes in DL12
Neighbouring districts
All Darlington (DL) postcode districts ›
Frequently asked questions
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Sources: HM Land Registry Price Paid Data, police.uk street-level crime, Ofcom Connected Nations, ONS Census 2021, DfE Get Information about Schools, Food Standards Agency FHRS — all © Crown copyright, licensed under the Open Government Licence v3.0. Figures are area aggregates; individual addresses vary. Energy performance (EPC) data will be added when our Open Data Communities registration is approved.