SL1 broadband and area guide
Ofcom coverage, connection speeds, house prices and local data for 1,497 postcodes across 9 sectors in Slough.
Full fibre
0%
Gigabit
92%
Superfast
97%
Postcodes
1,497
SL1 spans 1,497 postcodes in Buckinghamshire with strong gigabit at 92.4%, the Buckinghamshire leader, and excellent superfast coverage at 97.3%. Only 0.9% of postcodes sit below 10 Mbps, reflecting consistent modern infrastructure.
Broadband speeds in SL1
Share of SL1 premises by the fastest download speed available, averaged across all 1,497 postcodes in the district.
Gigabit availability at 92.4% is substantially higher than neighbouring SL0, marking SL1 as Buckinghamshire's premium connectivity zone across 1,497 postcodes. Ultrafast matches at 93.2%, with the slight divergence suggesting cable-dominant infrastructure. The speed distribution shows 93.2% at 300+ Mbps, 4.1% between 30 and 300 Mbps, and just 0.9% below 10 Mbps. Below-USO premises account for 0.3%, minimal across this large district. Superfast coverage at 97.3% exceeds the UK average. SL1 represents a transition to affluent commuter-belt suburbs where infrastructure investment has reached saturation, supporting both family homes and remote workers.
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
SL1 splits into 9 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 |
|---|---|---|---|---|
| SL1 1 | 170 | 99% | 0% | 88% |
| SL1 2 | 276 | 99% | 0% | 95% |
| SL1 3 | 255 | 100% | 0% | 99% |
| SL1 4 | 87 | 96% | 0% | 90% |
| SL1 5 | 248 | 100% | 0% | 99% |
| SL1 6 | 120 | 100% | 0% | 96% |
| SL1 7 | 125 | 100% | 0% | 95% |
| SL1 8 | 160 | 80% | 0% | 65% |
| SL1 9 | 56 | 100% | 0% | 98% |
All SL1 1 postcodes (170)
All SL1 2 postcodes (276)
All SL1 3 postcodes (255)
All SL1 4 postcodes (87)
All SL1 5 postcodes (248)
All SL1 6 postcodes (120)
All SL1 7 postcodes (125)
All SL1 8 postcodes (160)
All SL1 9 postcodes (56)
Best deals
Compare broadband deals in SL1
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Living in Slough
No house pricing information exists for this location. The gigabit dominance and minimal slow-postcode tail indicate a desirable residential location where modern infrastructure is complete.
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
SL1 broadband FAQs
Why is SL1 so much better connected than SL0?
SL1's position as Buckinghamshire's urban-commuter core means density and demand justify advanced deployment.
Is SL1 among the best-connected districts in this batch?
Yes. 92.4% gigabit ranks SL1 in the elite tier, matching SK7, SK13, and nearly matching Stockport's top codes.
How many premises in SL1 lack modern broadband?
0.9% of postcodes sit below 10 Mbps (roughly 13 locations out of 1,497), a negligible minority.
Would remote workers find SL1 suitable?
Absolutely. 92.4% gigabit and 97.3% superfast make SL1 excellent for bandwidth-intensive roles.
Neighbouring districts
Check your exact postcode
Every postcode in SL1 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