SN3 broadband and area guide
Ofcom coverage, connection speeds, house prices and local data for 1,244 postcodes across 7 sectors in Swindon.
Full fibre
0%
Gigabit
96%
Superfast
98%
Postcodes
1,244
SN3 is Swindon's most densely connected district, serving 1,244 postcodes with near-universal superfast and gigabit access.
Broadband speeds in SN3
Share of SN3 premises by the fastest download speed available, averaged across all 1,244 postcodes in the district.
This is one of Swindon's strongest connectivity zones. Nearly 98% of postcodes reach superfast speeds, matching the UK average, and a remarkable 96% can access gigabit coverage. The speed tiers are heavily skewed towards the top: 96% of addresses hit 300+ Mbps, while only 1.4% sit below 10 Mbps. The middle band of 30-300 Mbps accounts for just 1.4% of postcodes, a very small share reflecting the concentration of gigabit infrastructure. This means most households here can perform data-heavy tasks without constraint. The concentration of gigabit availability reflects cable or fibre rollout that has improved what most residents can do online, from simultaneous video conferencing to fast cloud backups. Only 0.1% fall below USO thresholds, and the speed distribution shows virtually no slow-speed tail.
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
SN3 splits into 7 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 |
|---|---|---|---|---|
| SN3 0 | 11 | 100% | 0% | 100% |
| SN3 1 | 205 | 97% | 0% | 91% |
| SN3 2 | 221 | 100% | 0% | 99% |
| SN3 3 | 223 | 100% | 0% | 99% |
| SN3 4 | 321 | 94% | TBC | 94% |
| SN3 5 | 104 | 100% | TBC | 99% |
| SN3 6 | 159 | 98% | TBC | 98% |
All SN3 0 postcodes (11)
All SN3 1 postcodes (205)
All SN3 2 postcodes (221)
All SN3 3 postcodes (223)
All SN3 4 postcodes (321)
All SN3 5 postcodes (104)
All SN3 6 postcodes (159)
Best deals
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Living in Swindon
For households and remote workers, SN3 is unusually reliable. The speed density at the high end means video conferencing, file syncing, and streaming have little risk of network congestion.
Remote worker score
55/100
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
SN3 broadband FAQs
Is full fibre actually available in SN3?
The data shows gigabit availability at 96%, but none of it is from full fibre (FTTP). Cable networks account for this gigabit reach instead.
What if my speed seems slower than 300 Mbps?
Your ISP's package tier and network congestion during peak hours matter more than the available infrastructure. Check what plan you're on and test during off-peak times.
Can everyone in SN3 work from home reliably?
Nearly all postcodes can. The exceptions are the 1.4% below 10 Mbps and 0.1% who cannot meet superfast thresholds at all.
Why is SN3 so much better connected than SN26?
Both are Swindon, but SN3's higher density and broader cable coverage mean gigabit has been deployed to far more postcodes here.
Neighbouring districts
Check your exact postcode
Every postcode in SN3 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