SN4 broadband and area guide
Ofcom coverage, connection speeds, house prices and local data for 794 postcodes across 5 sectors in Wiltshire.
Full fibre
0%
Gigabit
86%
Superfast
90%
Postcodes
794
SN4 spans 794 postcodes in Swindon with strong gigabit penetration but a notable tail of slower-speed postcodes.
Broadband speeds in SN4
Share of SN4 premises by the fastest download speed available, averaged across all 794 postcodes in the district.
Gigabit availability reaches 86%, significantly ahead of many rural areas but below SN3 or SN5. However, postcodes in the slower categories deserve attention. About 4% of SN4 still cannot reach superfast speeds, and a small but significant 4.3% sit below 10 Mbps. The gap between cable-gigabit haves and the have-nots is stark and clear. Where infrastructure exists, it delivers speeds approaching 300+ Mbps; where it doesn't, speed falls off sharply. The 30-300 Mbps middle band takes only 4% of postcodes, meaning most residents either score gigabit or face a steeper climb. This split reflects uneven rollout across the code, with some neighbourhoods receiving modern cable infrastructure while others retain older fibre or legacy technology. The below-USO rate of 0.7% indicates a few postcodes lag the legal minimum.
Source: Ofcom Connected Nations. Percentages are district-wide averages of postcode-level availability, so rows may not sum to exactly 100%.
Connectivity in detail
Below 10 Mbps USO
<1%
Premises unable to get the 10 Mbps universal service minimum
Fixed wireless
0%
Premises that can use a fixed wireless access service
Broadband by sector
SN4 splits into 5 postcode sectors. Coverage and prices can differ street by street, so open a sector below to find your exact postcode.
| Sector | Postcodes | Superfast | Full fibre | Gigabit |
|---|---|---|---|---|
| SN4 0 | 238 | 85% | 0% | 85% |
| SN4 4 | 1 | 100% | 0% | 0% |
| SN4 7 | 192 | 97% | 0% | 87% |
| SN4 8 | 179 | 99% | 0% | 95% |
| SN4 9 | 184 | 82% | 0% | 78% |
All SN4 0 postcodes (238)
All SN4 4 postcodes (1)
All SN4 7 postcodes (192)
All SN4 8 postcodes (179)
All SN4 9 postcodes (184)
Best deals
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Living in Wiltshire
This postcode district shows the classic split between well-served urban and under-served fringe areas. For someone deciding whether to move to SN4, location within the code matters enormously.
Remote worker score
54/100
Connectivity and amenities for home working
Family score
50/100
Schools, safety and family amenities
Value score
50/100
What you get for the local price level
SN4 broadband FAQs
What's the catch with gigabit coverage at 86%?
The remaining 14% are scattered across postcodes where cable or fibre has not reached yet. Speed tails off dramatically in those pockets.
Should I check my exact address before committing?
Absolutely. A postcode with 86% gigabit can still hide a small address with superfast or slower speeds. Verify your specific location.
Why does SN4 have 4% below USO speeds?
These are postcodes where infrastructure has not been upgraded to meet the Universal Service Obligation minimum. ISPs may offer alternatives, but you should ask first.
How much slower is the slower half?
About 4% maxes out below superfast, and 4.3% cannot reach 10 Mbps. The rest average well over 30 Mbps.
Neighbouring districts
Check your exact postcode
Every postcode in SN4 has its own page with broadband speeds, house prices, school ratings and crime stats. You can also compare providers for your address.
Data sources: Broadband data from Ofcom Connected Nations 2025 · House prices from HM Land Registry · Crime from Police.uk · See all data sources