LL51 postcode area guide — Gwynedd
House prices, crime, broadband speeds, mobile signal, schools and demographics for the LL51 postcode district in Gwynedd — every official dataset on one page.
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Where is LL51?
Broadband & internet speeds in LL51
Good coverage
Superfast (30Mb+)
80.4%
Ultrafast (300Mb+)
38.4%
Gigabit-capable
38.4%
Below USO (10Mb)
4%
Broadband availability in the LL51 postcode district (Gwynedd) is Good — superfast broadband reaches most premises. Across the 45 postcodes Ofcom measures in LL51, superfast broadband (30 Mbit/s or faster) reaches 80.4% of premises and gigabit-capable lines are available to 38.4%.
Around 4% of premises in LL51 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 LL51
| Postcode | Superfast | Gigabit |
|---|---|---|
| LL51 9AB | 100% | 100% |
| LL51 9AJ | 71.4% | 71.4% |
| LL51 9AL | 100% | 0% |
| LL51 9AQ | 71.4% | 71.4% |
| LL51 9AX | 72.4% | 72.4% |
| LL51 9AZ | 93.8% | 93.8% |
| LL51 9BQ | 40% | 40% |
| LL51 9DJ | 100% | 10% |
| LL51 9DQ | 81.8% | 72.7% |
| LL51 9DX | 57.1% | 0% |
Run a speed test to see what you're actually getting, or check your exact postcode.
Mobile signal around Gwynedd
Ofcom's coverage model for the wider Gwynedd district (68,440 premises):
4G indoors — all networks
76.8%
4G outdoors — all networks
95.3%
5G outdoors — all networks
—
Voice indoors — all networks
81.4%
Signal varies street by street — use the mobile coverage checker to compare EE, O2, Three and Vodafone at an exact postcode.
Crime in LL51
Police recorded 1 incidents within about a mile of the centre of LL51 in May 2026 (latest published street-level data). The breakdown:
| Category | Incidents | Share |
|---|---|---|
| Violence & sexual offences | 1 | 100.0% |
Raw counts favour busy town centres — a high street with shops and nightlife records more incidents than a residential cul-de-sac. Source: police.uk open data (point sample around the district centroid).
House prices in LL51
Based on 4 sales registered with HM Land Registry in the last 12 months, the median sold price in LL51 is £120,000, down 31.4% on the previous year (£175,000).
Latest recorded sales in LL51
| Date | Price | Type | Street | Postcode |
|---|---|---|---|---|
| 25 Feb 2026 | £120,000 | Semi-detached | Bro Pedr Fardd | LL51 9NX |
| 24 Oct 2025 | £170,000 | Detached | LL51 9RX | |
| 12 Sep 2025 | £45,000 | Other | Golan | LL51 9YU |
| 16 Jul 2025 | £145,000 | Detached | LL51 9RQ | |
| 12 Jun 2025 | £110,000 | Terraced | Maes Hyfryd | LL51 9SX |
| 2 May 2025 | £230,000 | Terraced | LL51 9NQ | |
| 2 May 2025 | £235,000 | Detached | LL51 9YU | |
| 7 Apr 2025 | £175,000 | Semi-detached | LL51 9LQ | |
| 21 Feb 2025 | £160,000 | Terraced | LL51 9TX | |
| 24 Jan 2025 | £380,000 | Detached | LL51 9YY |
Contains HM Land Registry data © Crown copyright and database right 2026, licensed under the Open Government Licence v3.0.
Who lives here? Gwynedd demographics
Census 2021 figures for the wider Gwynedd district (117,393 residents, 51,105 households):
| Age profile | |
|---|---|
| Under 15 | 16.6% |
| 15–29 | 23.3% |
| 30–44 | 15.9% |
| 45–64 | 21% |
| 65+ | 23.2% |
| Housing tenure | |
|---|---|
| Owner-occupied | 65.4% |
| Private rented | 17.6% |
| Social rented | 9.9% |
Source: ONS Census 2021 (district level — the finest openly licensed cut we republish). © Crown copyright, OGL v3.0.
Schools in and around LL51
| School | Phase | Ages | Pupils | Postcode |
|---|---|---|---|---|
| Ysgol Gynradd Garndolbenmaen | Not applicable | — | — | LL51 9SZ |
| Ysgol Llanystumdwy | Not applicable | — | — | LL52 0SP |
| Ysgol Treferthyr | Not applicable | — | — | LL52 0RR |
| Ysgol Gynradd Nebo | Not applicable | — | — | LL54 6EE |
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 LL51
8 rated food businesses operate in LL51. 6 hold the top rating of 5, 1 are rated 4, and none are currently rated 2 or below.
Among the 5-rated: Bocs Bwyd, Cane & Crosta, Cefn Uchaf Farm Guest House, Hen Ysgol, Tyddyn Mawr Tea Room.
Source: Food Standards Agency, food hygiene ratings (FHRS) open data.
Energy performance (EPC) in LL51
From a sample of 56 Energy Performance Certificates across 10 LL51 postcodes, the most common rating is band E (average band E). 16% of sampled homes are rated C or better.
Band A
4%
Band B
5%
Band C
7%
Band D
29%
Band E
30%
Band F
18%
Band G
7%
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 Gwynedd
Landlines around LL51 typically use:
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What's it like living in LL51?
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Moving to LL51? Sort your connectivity first
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Postcodes in LL51
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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.