Cardiff South and Penarth Broadband Coverage
Westminster parliamentary constituency · Wales · 55,450 premises
84.1% full-fibre puts Cardiff South and Penarth ahead of the 81% UK average.
The verdict
Cardiff South and Penarth ranks #294 of 650 constituencies for full-fibre (84.1%) and #319 for the fixed/FWA availability gap (0.0%) - those two corpus maps diverge.
Broadband Coverage in Cardiff South and Penarth
Wales's Cardiff South and Penarth constituency has 55,450 premises on record. The full-fibre figure is 84.1%, above-average; gigabit-capable coverage (DOCSIS 3.1 cable included) is higher at 88.8%. Superfast (30 Mbit/s or more) is at 95.7% and ultrafast (300 Mbit/s or more) at 90.2%.
On connectivity for all households, Cardiff South and Penarth has near-universal fixed and fixed-wireless broadband availability: fewer than 1% of premises cannot receive a decent service. Mid-pack full-fibre at 84.1% is 3.1pp above the 81% UK average; gigabit-capable coverage is 88.8% and ultrafast 90.2%.
Where these figures come from
Figures are drawn from Ofcom's Connected Nations Spring 2026 report (January 2026 snapshot, published May 2026 (r1)), which aggregates postcode-sector data to constituency level. They represent coverage availability from at least one network operator, not the proportion of households that have subscribed to a given speed tier, nor the typical or guaranteed speeds that customers actually receive. Nearby constituencies in Wales with comparable full-fibre coverage are listed below.
Coverage Metrics
Where Cardiff South and Penarth Sits Nationally
Cardiff South and Penarth vs every UK parliamentary constituency
Full-fibre coverage distribution across all 650 UK constituencies. Cardiff South and Penarth's 84.1% places it in the highlighted band.
84.1% Top 46% higher than 54% of 650 UK constituencies
every UK parliamentary constituency, bucketed by value
Each bar is a band; taller bars hold more UK constituencies. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source Ofcom Connected Nations Spring 2026 · January 2026 snapshot, published May 2026 (r1)
Related
Source: Source: Ofcom Connected Nations Spring 2026 (January 2026 snapshot, published May 2026 (r1)).
Nationwide constituencies with similar full-fibre or gigabit coverage
Two Ofcom peer sets for Cardiff South and Penarth (mid-pack full-fibre at 84.1%), both outside Wales so the neighborhoods are not the same-nation Nearby block above.
Similar full-fibre
Nearest other-nation constituencies by full-fibre coverage (84.1% here; floor ≥5,000 premises).
Similar gigabit
Nearest other-nation constituencies by gigabit-capable coverage (88.8% here).
What 84.1% full-fibre means for Cardiff South and Penarth
Cardiff South and Penarth is 3.1pp ahead of the 81% UK average, but coverage still varies street by street.
- Check your own address, a constituency average can hide big street-by-street differences in coverage. Check your postcode
- See how Cardiff South and Penarth ranks against every other UK constituency, not just the national average. Full UK rankings
- Understand what full-fibre actually gets you before switching. How Ofcom Connected Nations works
Coverage figures are Ofcom Connected Nations availability data, not a guarantee of service at any single address; always check before switching.
Frequently Asked Questions
Where does Cardiff South and Penarth sit in the national full-fibre distribution?
Cardiff South and Penarth has 84.1% full-fibre coverage, 3.1pp above the 81% UK average (rank #294 of 650), higher than 354 of 650 UK constituencies. Gigabit-capable coverage is 88.8%.
What share of Cardiff South and Penarth premises still lack decent fixed/FWA broadband?
Ofcom's Spring 2026 measure shows all measured premises in Cardiff South and Penarth can receive decent fixed or fixed-wireless broadband. Ultrafast (≥300 Mbit/s) coverage is 90.2%.
This constituency's figures are computed directly from Ofcom Connected Nations data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.