CM3 postcode

Broadband in CM3 4AN

Sandon, Chelmsford

Gigabit broadband is available at this postcode.

Best speedGigabit (1Gbps+)
StandardSuperfastGigabit
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Free, independent comparison · Ofcom verified data · Updated 19 March 2026

Flood Risk

Medium

Fibre (FTTP)

No

Best speed

Gigabit (1Gbps+)

Reviewed by Arthur TuringData last verified: 19 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 CM3 4AN. 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 CM3 4AN.

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)N/A
N/A
300-900 Mbps
Gigabit100%
100%
900-1,000 Mbps

Speed Distribution at CM3 4AN

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: 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 Chelmsford

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 CM3 4AN

Sandon is home to CM3 4AN. 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 CM3 4AN 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 CM3 4AN 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.

Translating the numbers at CM3 4AN into daily use gives a clearer picture. 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 CM3 4AN. 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 CM3 4AN, 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 CM3 4AN 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 CM3 4AN 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 CM3 4AN: remote working 55/100, family 50/100, value 50/100. Remote workers may want to verify actual speeds before committing.

CM3 4AN falls within the Chelmsford local authority area. The immediate area is Sandon, a distinct community within the wider district. The CM3 postcode area contains 1558 postcodes on this site. Superfast broadband across CM3 ranges from 0% to 100%. CM3 4AN is above the area average of 94%.

When choosing a broadband provider at CM3 4AN, check what technology reaches your specific address. Availability varies by street and sometimes by building. 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.

Life in Sandon depends on what matters to you. Broadband, transport, and local services vary by street.

Pulling the data together for CM3 4AN, here is what stands out. Connectivity at CM3 4AN is a strength. Strong broadband coverage gives flexibility for both working and leisure. The area scores well on that front. Chelmsford 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. Sandon 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.

Before making a decision about CM3 4AN, visit in person. Check the commute at rush hour. Try the mobile signal indoors. Look at local shops and green spaces. Ask about broadband reliability, not just speed. Data sets the scene, but real life fills in the gaps.

This covers the key data for CM3 4AN. Broadband, property, schools, safety, and local services all in one place. For area-wide trends, see the Sandon hub page. Bookmark this page and check back as new data arrives.

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 CM3 4AN

What are the broadband speeds available at CM3 4AN?

Superfast broadband (30 Mbps+) is available to 100% of premises at CM3 4AN. Ultrafast coverage is at 100%.

What is the average house price near CM3 4AN?

No recent house price data is available for CM3 4AN.

What is the flood risk for properties at CM3 4AN?

CM3 4AN has a Medium flood risk rating. Check Environment Agency maps for detail.

What schools are nearby in the CM3 4AN area?

School data for CM3 4AN is being updated. Check the Get Information About Schools service for the latest.

How does crime rate in CM3 4AN compare to other areas?

Crime data for this area is being updated.

How suitable is CM3 4AN for remote working?

CM3 4AN scores 55/100 for remote working suitability. Speeds may limit video-heavy workflows.

What is the mobile signal like at CM3 4AN?

4G outdoor coverage at CM3 4AN is 95%. Indoor coverage may be lower.

What is the most common energy efficiency rating near CM3 4AN?

EPC data for CM3 4AN is being updated. Check the EPC register for individual property ratings.

What is the council tax band distribution at CM3 4AN?

Council tax band information for CM3 4AN is being updated.

How accessible are GP surgeries near CM3 4AN?

GP surgery data for CM3 4AN is being updated. Check NHS.uk for the latest.

What transport links are available near CM3 4AN?

Transport data for CM3 4AN is being updated.

Is CM3 4AN a suitable area for families?

CM3 4AN scores 50/100 for family suitability. Check school and crime sections above for detail.

What is the air quality like at CM3 4AN?

Air quality data for CM3 4AN is being updated.

How far is the nearest EV charging point from CM3 4AN?

EV charging data for CM3 4AN is being updated. Check Zap-Map for the latest.

Can I get full fibre broadband at CM3 4AN?

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

Area suitability scores

CM3 4AN

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

Sandon

District

Chelmsford

Region

Constituency

LSOA

E01021571

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