CF23 postcode area guide — Cardiff
House prices, crime, broadband speeds, mobile signal, schools and demographics for the CF23 postcode district in Cardiff — every official dataset on one page.
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Where is CF23?
Broadband & internet speeds in CF23
Excellent coverage
Superfast (30Mb+)
98.2%
Ultrafast (300Mb+)
84.5%
Gigabit-capable
82%
Below USO (10Mb)
0%
Broadband availability in the CF23 postcode district (Cardiff) is Excellent — gigabit-capable full fibre is widely available. Across the 880 postcodes Ofcom measures in CF23, superfast broadband (30 Mbit/s or faster) reaches 98.2% of premises and gigabit-capable lines are available to 82%.
Around 0% of premises in CF23 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 CF23
| Postcode | Superfast | Gigabit |
|---|---|---|
| CF23 5AA | 100% | 100% |
| CF23 5AB | 100% | 100% |
| CF23 5AD | 100% | 100% |
| CF23 5AE | 100% | 100% |
| CF23 5AF | 100% | 100% |
| CF23 5AG | 100% | 100% |
| CF23 5AH | 100% | 100% |
| CF23 5AJ | 100% | 100% |
| CF23 5AL | 100% | 100% |
| CF23 5AN | 100% | 100% |
Run a speed test to see what you're actually getting, or check your exact postcode.
Mobile signal around Cardiff
Ofcom's coverage model for the wider Cardiff district (173,267 premises):
4G indoors — all networks
98%
4G outdoors — all networks
99.8%
5G outdoors — all networks
96.7%
Voice indoors — all networks
98.9%
Signal varies street by street — use the mobile coverage checker to compare EE, O2, Three and Vodafone at an exact postcode.
Crime in CF23
Police recorded 163 incidents within about a mile of the centre of CF23 in May 2026 (latest published street-level data). The breakdown:
| Category | Incidents | Share |
|---|---|---|
| Violence & sexual offences | 64 | 39.3% |
| Anti-social behaviour | 16 | 9.8% |
| Shoplifting | 16 | 9.8% |
| Other theft | 15 | 9.2% |
| Public order | 13 | 8.0% |
| Burglary | 10 | 6.1% |
| Vehicle crime | 9 | 5.5% |
| Criminal damage & arson | 5 | 3.1% |
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 CF23
Based on 445 sales registered with HM Land Registry in the last 12 months, the median sold price in CF23 is £279,000, down 5.4% on the previous year (£295,000).
Detached
£540,600
89 sales
Semi-detached
£304,000
107 sales
Terraced
£242,000
149 sales
Flat / maisonette
£176,500
91 sales
Latest recorded sales in CF23
| Date | Price | Type | Street | Postcode |
|---|---|---|---|---|
| 19 May 2026 | £405,000 | Semi-detached | Torrens Drive | CF23 6DQ |
| 15 May 2026 | £335,000 | Semi-detached | Grafton Close | CF23 9JB |
| 11 May 2026 | £215,000 | Terraced | The Hawthorns | CF23 7AT |
| 8 May 2026 | £173,000 | Flat | Melrose Avenue | CF23 9AU |
| 8 May 2026 | £450,000 | Semi-detached | Brynderwen Close | CF23 6BR |
| 8 May 2026 | £295,000 | Flat | Linnet Close | CF23 7HG |
| 1 May 2026 | £200,000 | Flat | Shirley Road | CF23 5HL |
| 30 Apr 2026 | £200,000 | Semi-detached | Clos Gwy | CF23 8LH |
| 29 Apr 2026 | £228,000 | Semi-detached | Coeden Dal | CF23 7DJ |
| 28 Apr 2026 | £279,000 | Semi-detached | Forsythia Drive | CF23 7HP |
Contains HM Land Registry data © Crown copyright and database right 2026, licensed under the Open Government Licence v3.0.
Who lives here? Cardiff demographics
Census 2021 figures for the wider Cardiff district (362,308 residents, 147,333 households):
| Age profile | |
|---|---|
| Under 15 | 18.2% |
| 15–29 | 32.2% |
| 30–44 | 18.6% |
| 45–64 | 16.5% |
| 65+ | 14.5% |
| Housing tenure | |
|---|---|
| Owner-occupied | 58% |
| Private rented | 24.6% |
| Social rented | 8.4% |
Source: ONS Census 2021 (district level — the finest openly licensed cut we republish). © Crown copyright, OGL v3.0.
Schools in and around CF23
| School | Phase | Ages | Pupils | Postcode |
|---|---|---|---|---|
| Glyncoed Primary School | Not applicable | — | — | CF23 7DW |
| Corpus Christi Catholic High School | Not applicable | — | — | CF23 6XL |
| The Hollies Special School | Not applicable | — | — | CF23 7XG |
| Ysgol Gynradd Gymraeg Pen-Y-Groes | Not applicable | — | — | CF23 7EH |
| Marlborough Primary | Not applicable | — | — | CF23 5BU |
| Ysgol Gyfun Gymraeg Bro Edern | Not applicable | — | — | CF23 9DT |
| Howardian Primary School | Not applicable | — | — | CF23 9NB |
| Pontprennau Primary School | Not applicable | — | — | CF23 8LL |
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 CF23
205 rated food businesses operate in CF23. 153 hold the top rating of 5, 22 are rated 4, and 3 are rated 2 or below.
Among the 5-rated: Aldi, All Saints Primary School, Asda Stores Ltd, Auntie April, B and M Retail Ltd.
Source: Food Standards Agency, food hygiene ratings (FHRS) open data.
Energy performance (EPC) in CF23
From a sample of 128 Energy Performance Certificates across 10 CF23 postcodes, the most common rating is band D (average band D). 45% of sampled homes are rated C or better.
Band B
1%
Band C
44%
Band D
47%
Band E
6%
Band F
2%
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 Cardiff
Landlines around CF23 typically use:
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What's it like living in CF23?
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Postcodes in CF23
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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.