CO4 postcode

Broadband in CO4 5SY

Boxted, Colchester

Gigabit broadband is available at this postcode.

Best speedGigabit (1Gbps+)
StandardSuperfastGigabit
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Free, independent comparison · Ofcom verified data · Updated 15 March 2026

Flood Risk

Medium

Fibre (FTTP)

No

Best speed

Gigabit (1Gbps+)

Reviewed by Arthur TuringData last verified: 15 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 CO4 5SY. 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 CO4 5SY.

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)20%
20%
10-20 Mbps
Superfast (30+ Mbps)20%
20%
30-80 Mbps
Ultrafast (100+ Mbps)20%
20%
100-300 Mbps
Full Fibre (FTTP)0%
0%
300-900 Mbps
Gigabit20%
20%
900-1,000 Mbps

Speed Distribution at CO4 5SY

10–30 Mbps (80%)
300+ Mbps (20%)

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: Medium

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

Flood Zone

Risk Level

Medium

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 Colchester

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 CO4 5SY

This is the area guide for CO4 5SY, located in Boxted (Colchester). It covers connectivity, property, safety, and local services. Every claim links back to a specific data point. Read on for the detail.

20% of premises at CO4 5SY can access superfast broadband. The UK average is 93%. There is room for improvement here. Ultrafast broadband (100 Mbps+) reaches 20% of properties. Fewer than half of homes here can get ultrafast speeds. Gigabit-capable connections cover 20% of premises. Gigabit is available but not yet widespread at this postcode.

Looking at the full speed profile for CO4 5SY gives a better picture of what to expect. 80% of connections fall in the 10 to 30 Mbps range. 20% 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.

Here is how the broadband at CO4 5SY maps against common household needs. Superfast coverage is limited here. Streaming HD video should work on one device. Multiple simultaneous streams may struggle during peak hours. Limited superfast coverage means remote workers should test their connection carefully. Video calls may drop or pixelate. A mobile hotspot can serve as a backup.

Fixed Wireless Access is not currently available at CO4 5SY. 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 CO4 5SY, 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 CO4 5SY is rated Medium. 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 CO4 5SY 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. Strong 4G coverage combined with limited fixed broadband means 4G home broadband could be a practical alternative here.

Suitability scores for CO4 5SY: remote working 35/100, family 50/100, value 50/100. Remote workers may want to verify actual speeds before committing.

The local authority for CO4 5SY is Colchester. The immediate area is Boxted, a distinct community within the wider district. The CO4 postcode area contains 1174 postcodes on this site. Superfast broadband across CO4 ranges from 0% to 100%. CO4 5SY is below the area average of 96%.

Broadband availability varies by provider and by property. At CO4 5SY, 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.

Every part of Boxted has its own feel. This data gives you the factual starting point. A visit fills in the rest.

Looking at the overall picture for CO4 5SY, a few things are worth highlighting. Colchester 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. Boxted 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 Boxted. 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 CO4 5SY in Boxted. 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 CO4 5SY

What are the broadband speeds available at CO4 5SY?

Superfast broadband (30 Mbps+) is available to 20% of premises at CO4 5SY. Ultrafast coverage is at 20%.

What is the average house price near CO4 5SY?

No recent house price data is available for CO4 5SY.

What is the flood risk for properties at CO4 5SY?

CO4 5SY has a Medium flood risk rating. Check Environment Agency maps for detail.

What schools are nearby in the CO4 5SY area?

School data for CO4 5SY is being updated. Check the Get Information About Schools service for the latest.

How does crime rate in CO4 5SY compare to other areas?

Crime data for this area is being updated.

How suitable is CO4 5SY for remote working?

CO4 5SY scores 35/100 for remote working suitability. Speeds may limit video-heavy workflows.

What is the mobile signal like at CO4 5SY?

4G outdoor coverage at CO4 5SY is 95%. Indoor coverage may be lower.

What is the most common energy efficiency rating near CO4 5SY?

EPC data for CO4 5SY is being updated. Check the EPC register for individual property ratings.

What is the council tax band distribution at CO4 5SY?

Council tax band information for CO4 5SY is being updated.

How accessible are GP surgeries near CO4 5SY?

GP surgery data for CO4 5SY is being updated. Check NHS.uk for the latest.

What transport links are available near CO4 5SY?

Transport data for CO4 5SY is being updated.

Is CO4 5SY a suitable area for families?

CO4 5SY scores 50/100 for family suitability. Check school and crime sections above for detail.

What is the air quality like at CO4 5SY?

Air quality data for CO4 5SY is being updated.

How far is the nearest EV charging point from CO4 5SY?

EV charging data for CO4 5SY is being updated. Check Zap-Map for the latest.

Can I get full fibre broadband at CO4 5SY?

Ultrafast broadband (100 Mbps+) reaches 20% of premises. Check Openreach and local operators for FTTP availability.

Area suitability scores

CO4 5SY

Remote Worker

35

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

Boxted

District

Colchester

Region

Constituency

LSOA

E01021659

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