SL4 postcode

Broadband in SL4 3DL

Windsor and Maidenhead, Windsor and Maidenhead

Gigabit broadband is available at this postcode.

Best speedGigabit (1Gbps+)
StandardSuperfastGigabit
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Free, independent comparison · Ofcom verified data · Updated 29 March 2026

Flood Risk

High

Fibre (FTTP)

No

Best speed

Gigabit (1Gbps+)

Reviewed by Arthur TuringData last verified: 29 March 2026

Speed Calculator

Adjust the options below to see how much broadband speed your household needs.

2
18

HD uses ~5 Mbps per person. 4K uses ~25 Mbps.

Each person on calls needs around 10 Mbps.

Competitive gaming needs low latency as much as raw speed.

Cameras, thermostats, speakers and similar devices each use a few Mbps.

Estimated speed needed14 Mbps

Gigabit broadband (Gigabit (1Gbps+)) is available at SL4 3DL. That covers your 14 Mbps needs with room to spare.

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Speed Test

Check your current download speed and see how it compares to what is available at SL4 3DL.

The test downloads a 2 MB file from our server and measures how long it takes.

This test measures download speed only. Results vary depending on network conditions.

Broadband availability

Source: Ofcom Connected Nations 2025 (Jul 2025)

TechnologyAvailableCoverageTypical Speed
Standard (ADSL)100%
100%
10-20 Mbps
Superfast (30+ Mbps)100%
100%
30-80 Mbps
Ultrafast (100+ Mbps)100%
100%
100-300 Mbps
Full Fibre (FTTP)0%
0%
300-900 Mbps
Gigabit100%
100%
900-1,000 Mbps

Speed Distribution at SL4 3DL

100%
300+ Mbps (100%)

Source: Ofcom Connected Nations 2025

Mobile coverage

4G & 5G coverage · Ofcom Connected Nations 2025

4G Outdoor

95%

4G Indoor

85%

5G Outdoor

%

Networks with 4G

EEO2ThreeVodafone
Ofcom Connected Nations 2025

Schools nearby

Nearest schools within 5 miles · Ofsted ratings as at Jan 2026

Schools data is currently unavailable.

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Flood risk

🔴

Flood risk: High

This postcode is in undefined — high risk of flooding from rivers and sea.

Flood Zone

Risk Level

High

Environment Agency

Air quality

Particulate matter & nitrogen dioxide levels

air quality

Air quality data not available.

PM2.5 (fine particles) μg/m³

WHO guideline: 15 μg/m³

PM10 (coarse particles) μg/m³

WHO guideline: 45 μg/m³

NO₂ (nitrogen dioxide) μg/m³

WHO guideline: 25 μg/m³

DEFRA UK-AIR · Guidelines: WHO 2021

Transport links

Nearest train stations and towns

Nearest train stations

No train stations found within 15 miles

Network Rail / National Rail · Straight-line distances

Council tax bands

Band distribution for Windsor and Maidenhead

Most common: Band

A
5%£1,381
B
10%£1,611
C
20%£1,841
D
25%£2,071
E
20%£2,531
F
10%£2,991
G
8%£3,452
H
2%£4,142

Annual council tax estimates for , 2024/25

VOA (Valuation Office Agency)

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Living near SL4 3DL

Windsor and Maidenhead is home to SL4 3DL. Whether you live here or plan to move, the data below paints a clear picture. Broadband, schools, crime, house prices, and local services all follow. The numbers speak for themselves.

Superfast broadband (30 Mbps+) coverage at SL4 3DL stands at 100%. That is above the UK average of 93%. Ultrafast broadband (100 Mbps+) reaches 100% of properties. That is solid coverage for bandwidth-heavy households. Gigabit-capable connections cover 100% of premises. Most homes can access gigabit speeds if they choose to.

The speed distribution at SL4 3DL tells a more detailed story than headline figures alone. 100% of connections fall in the 300 Mbps or faster range. No premises here are stuck below 5 Mbps. Every property meets the basic threshold for video calls. Over half of connections exceed 300 Mbps. That supports multiple 4K streams, large file transfers, and cloud gaming without issue.

Here is how the broadband at SL4 3DL maps against common household needs. Most premises have superfast speeds. Remote working with video calls and cloud tools should be manageable for most households.

Fixed Wireless Access is not currently available at SL4 3DL. For properties without fibre, 4G or 5G home broadband from Three, EE, or Vodafone may be an alternative.

The USO guarantees every UK home at least 10 Mbps. At SL4 3DL, 0% of properties do not meet this threshold. Every property here meets the minimum standard. That is not the case everywhere. Next-generation access (NGA) reaches 100% of the area. NGA typically means speeds of 24 Mbps or above.

Flood risk at SL4 3DL is rated High. Check Environment Agency flood maps for detailed information. Specialist flood insurance may be needed.

The three most common bands are D (25%), C (20%), E (20%). Band D corresponds to 1991 property values of £68,001 to £88,000. Current values are typically much higher. The spread across mid-range bands suggests a varied housing stock.

Outdoor 4G mobile signal at SL4 3DL is available across 95% of the area. Indoor 4G drops to 85%. Some signal loss indoors is normal. Most calls and data should still work inside. Coverage data covers EE, O2, Three, Vodafone. Check each operator individually, as coverage varies by network.

Suitability scores for SL4 3DL: remote working 55/100, family 50/100, value 50/100. Remote workers may want to verify actual speeds before committing.

SL4 3DL falls within the Windsor and Maidenhead local authority area. The SL4 postcode area contains 1282 postcodes on this site. Superfast broadband across SL4 ranges from 0% to 100%. SL4 3DL is above the area average of 93%.

How does SL4 3DL compare to its neighbours? SL4 3FG (0.02 miles, windsor-and-maidenhead-unparished-area) has 100% superfast coverage and 0% gigabit. SL4 3LW (0.05 miles, windsor-and-maidenhead-unparished-area) has 100% superfast coverage and 100% gigabit. SL4 3LN (0.06 miles, windsor-and-maidenhead-unparished-area) has 100% superfast coverage and 100% gigabit. Coverage is broadly similar across these neighbouring postcodes.

Broadband availability varies by provider and by property. At SL4 3DL, check individual coverage tools from BT, Sky, Virgin Media, and local operators. If fibre is unavailable, consider 4G home broadband or satellite as alternatives. Speeds may still be adequate for most uses. Compare contract lengths, total costs over the term, and exit fees. The cheapest monthly rate is not always the best deal.

Windsor and Maidenhead offers a mix of residential properties and local amenities. The character of any area is best judged in person.

Looking at the overall picture for SL4 3DL, a few things are worth highlighting. Connectivity at SL4 3DL is a strength. Strong broadband coverage gives flexibility for both working and leisure. The area scores well on that front. Windsor and Maidenhead as a local authority area has its own planning priorities, council services, and infrastructure investment plans. Check the council website for the latest. The data covers what can be measured. Windsor and Maidenhead has its own character that numbers alone cannot capture. Use these figures as a filter, then visit to get the full picture.

Data sources include Ofcom (broadband and mobile), Land Registry (house prices), Police.uk (crime), Ofsted (schools), Environment Agency (flood risk), and Open-Meteo (air quality). Council tax data comes from the Valuation Office Agency. EPC data is from DLUHC. Transport data uses NaPTAN. Speed distribution figures are from Ofcom Connected Nations. All figures are the latest available at the time of writing.

Data is a starting point for Windsor and Maidenhead. Walk the streets at different times. Test your mobile signal. Check parking, noise levels, and the feel of the neighbourhood. Run a speed test on the actual connection. Some things only a visit can reveal.

That is the full data picture for SL4 3DL in Windsor and Maidenhead. Use it alongside your own research. For the most current broadband speeds, run a live speed test from this page. Check back periodically as data is refreshed with new releases.

More local data is being added for this postcode

This page already has postcode-specific content, and more data-backed sections will appear as the remaining local datasets finish processing.

Frequently asked questions about SL4 3DL

What are the broadband speeds available at SL4 3DL?

Superfast broadband (30 Mbps+) is available to 100% of premises at SL4 3DL. Ultrafast coverage is at 100%.

What is the average house price near SL4 3DL?

No recent house price data is available for SL4 3DL.

What is the flood risk for properties at SL4 3DL?

SL4 3DL has a High flood risk rating. Check Environment Agency maps for detail.

What schools are nearby in the SL4 3DL area?

School data for SL4 3DL is being updated. Check the Get Information About Schools service for the latest.

How does crime rate in SL4 3DL compare to other areas?

Crime data for this area is being updated.

How suitable is SL4 3DL for remote working?

SL4 3DL scores 55/100 for remote working suitability. Speeds may limit video-heavy workflows.

What is the mobile signal like at SL4 3DL?

4G outdoor coverage at SL4 3DL is 95%. Indoor coverage may be lower.

What is the most common energy efficiency rating near SL4 3DL?

EPC data for SL4 3DL is being updated. Check the EPC register for individual property ratings.

What is the council tax band distribution at SL4 3DL?

Council tax band information for SL4 3DL is being updated.

How accessible are GP surgeries near SL4 3DL?

GP surgery data for SL4 3DL is being updated. Check NHS.uk for the latest.

What transport links are available near SL4 3DL?

Transport data for SL4 3DL is being updated.

Is SL4 3DL a suitable area for families?

SL4 3DL scores 50/100 for family suitability. Check school and crime sections above for detail.

What is the air quality like at SL4 3DL?

Air quality data for SL4 3DL is being updated.

How far is the nearest EV charging point from SL4 3DL?

EV charging data for SL4 3DL is being updated. Check Zap-Map for the latest.

Can I get full fibre broadband at SL4 3DL?

Ultrafast broadband (100 Mbps+) reaches 100% of premises. Check Openreach and local operators for FTTP availability.

Area suitability scores

SL4 3DL

Remote Worker

55

Based on superfast broadband coverage, FTTP %, and 4G mobile outdoor coverage.

Family

50

Based on Ofsted school ratings, crime rate, flood risk, and GP surgery proximity.

Value for Money

50

Based on broadband quality relative to average house price in the area.

Map

Area info

Parish

Windsor and Maidenhead

District

Windsor and Maidenhead

Region

Constituency

LSOA

E01016550

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