SL3 broadband and area guide
Ofcom coverage, connection speeds, house prices and local data for 1,036 postcodes across 5 sectors in Slough.
Full fibre
0%
Gigabit
84%
Superfast
96%
Postcodes
1,036
SL3 in Buckinghamshire spans 1,036 postcodes with some of the best gigabit take-up in the region. Eight in ten postcodes support speeds above 300 Mbps.
Broadband speeds in SL3
Share of SL3 premises by the fastest download speed available, averaged across all 1,036 postcodes in the district.
Just over 84% of SL3 can access 300 Mbps or faster through cable networks. Gigabit capability reaches 83.6%, reflecting consistent infrastructure investment across the district. Superfast coverage is 96%, barely nudging below the UK norm. The connectivity floor is particularly high: only 0.7% of postcodes fall short of the USO 10 Mbps minimum. This leaves 11.6% in the 30 to 300 Mbps band, typically sufficient for households that do not maintain simultaneous heavy use. Cable maturity means most premises receive modern service without special pleading. The absence of any full fibre infrastructure means cable networks carry all gigabit traffic here. Residents enjoy practical choice of cable providers rather than debating speed availability.
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
SL3 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 |
|---|---|---|---|---|
| SL3 0 | 153 | 91% | 0% | 64% |
| SL3 6 | 135 | 84% | 0% | 52% |
| SL3 7 | 292 | 100% | 0% | 98% |
| SL3 8 | 288 | 99% | 0% | 94% |
| SL3 9 | 168 | 98% | 0% | 85% |
All SL3 0 postcodes (153)
All SL3 6 postcodes (135)
All SL3 7 postcodes (292)
All SL3 8 postcodes (288)
All SL3 9 postcodes (168)
Best deals
Compare broadband deals in SL3
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Living in Slough
At 1,036 postcodes, SL3 encompasses suburban and semi-rural plots. Gigabit access this widespread means that property-hunting families can assume broadband is solved unless a postcode sits in the tiny below-10Mbps tail.
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
SL3 broadband FAQs
How many homes can get gigabit speeds?
83.6% of SL3 postcodes support gigabit. That is roughly four in five addresses with the cable capacity to hit 1,000 Mbps or above.
What speeds should I expect if I move here?
84.4% of postcodes sit at 300 Mbps or faster. If your postcode is in the remaining 15%, you will likely get 30-300 Mbps, which handles browsing, email and SD streaming without strain.
Are there problem postcodes in SL3?
Yes, but rare. Only 0.7% fall below 10 Mbps. Around 0.4% have below-USO coverage. Site-specific checks are wise, but risk is low.
No full fibre here?
Correct. SL3's high speeds are entirely cable-delivered. Full fibre infrastructure has not yet been recorded in this outward code.
Neighbouring districts
Check your exact postcode
Every postcode in SL3 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