CM3 postcode

Broadband in CM3 8DY

Rettendon, Chelmsford

Superfast broadband covers 98% of premises here.

Best speed~30 Mbps
StandardSuperfastGigabit
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Free, independent comparison · Ofcom verified data · Updated 19 March 2026

Flood Risk

Low

Fibre (FTTP)

No

Best speed

~30 Mbps

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

The best available speed at CM3 8DY is ~30 Mbps. That covers your 14 Mbps estimate.

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Speed Test

Check your current download speed and see how it compares to what is available at CM3 8DY.

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)98%
98%
10-20 Mbps
Superfast (30+ Mbps)98%
98%
30-80 Mbps
Ultrafast (100+ Mbps)0%
0%
100-300 Mbps
Full Fibre (FTTP)N/A
N/A
300-900 Mbps
Gigabit0%
0%
900-1,000 Mbps

Speed Distribution at CM3 8DY

10–30 Mbps (2%)
30–300 Mbps (98%)

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: Low

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

Flood Zone

Risk Level

Low

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 8DY

This is the area guide for CM3 8DY, located in Rettendon (Chelmsford). It covers connectivity, property, safety, and local services. Every claim links back to a specific data point. Read on for the detail.

98% of premises at CM3 8DY can access superfast broadband. The UK average is 93%. This postcode meets or exceeds that benchmark.

Looking at the full speed profile for CM3 8DY gives a better picture of what to expect. 2% of connections fall in the 10 to 30 Mbps range. 98% of connections fall in the 30 to 300 Mbps range. No premises here are stuck below 5 Mbps. Every property meets the basic threshold for video calls.

What do the broadband speeds at CM3 8DY mean in practice? Most premises have superfast speeds. Remote working with video calls and cloud tools should be manageable for most households.

Fixed Wireless Access (FWA) is available to 2% of premises at CM3 8DY. FWA uses a fixed antenna to deliver broadband without a phone line or fibre cable. FWA is an option for some properties. Check individual provider coverage before committing.

The USO guarantees every UK home at least 10 Mbps. At CM3 8DY, 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 98% of the area. NGA typically means speeds of 24 Mbps or above.

Flood risk at CM3 8DY is rated Low. Minor precautions may be worth considering. Check with insurers about any loading on premiums.

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 8DY 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 8DY: remote working 50/100, family 50/100, value 50/100. Remote workers may want to verify actual speeds before committing.

The local authority for CM3 8DY is Chelmsford. The immediate area is Rettendon, 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 8DY is close to the area average of 94%.

When choosing a broadband provider at CM3 8DY, 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 Rettendon depends on what matters to you. Broadband, transport, and local services vary by street.

Looking at the overall picture for CM3 8DY, a few things are worth highlighting. Connectivity at CM3 8DY 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. Rettendon 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.

Numbers tell part of the story for CM3 8DY. Visit at different times of day. Talk to neighbours. Check mobile signal indoors. Walk the route to the nearest school or station. Test the broadband speed from inside the property. These things do not show up in data.

CM3 8DY in Rettendon: broadband, house prices, crime, schools, and more. All from verified sources. Run a speed test above for a live reading. Compare with nearby postcodes to see how this area stacks up against its neighbours.

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 8DY

What are the broadband speeds available at CM3 8DY?

Superfast broadband (30 Mbps+) is available to 98% of premises at CM3 8DY.

What is the average house price near CM3 8DY?

No recent house price data is available for CM3 8DY.

What is the flood risk for properties at CM3 8DY?

CM3 8DY has a Low flood risk rating. Check Environment Agency maps for detail.

What schools are nearby in the CM3 8DY area?

School data for CM3 8DY is being updated. Check the Get Information About Schools service for the latest.

How does crime rate in CM3 8DY compare to other areas?

Crime data for this area is being updated.

How suitable is CM3 8DY for remote working?

CM3 8DY scores 50/100 for remote working suitability. Speeds may limit video-heavy workflows.

What is the mobile signal like at CM3 8DY?

4G outdoor coverage at CM3 8DY is 95%. Indoor coverage may be lower.

What is the most common energy efficiency rating near CM3 8DY?

EPC data for CM3 8DY is being updated. Check the EPC register for individual property ratings.

What is the council tax band distribution at CM3 8DY?

Council tax band information for CM3 8DY is being updated.

How accessible are GP surgeries near CM3 8DY?

GP surgery data for CM3 8DY is being updated. Check NHS.uk for the latest.

What transport links are available near CM3 8DY?

Transport data for CM3 8DY is being updated.

Is CM3 8DY a suitable area for families?

CM3 8DY scores 50/100 for family suitability. Check school and crime sections above for detail.

What is the air quality like at CM3 8DY?

Air quality data for CM3 8DY is being updated.

How far is the nearest EV charging point from CM3 8DY?

EV charging data for CM3 8DY is being updated. Check Zap-Map for the latest.

Can I get full fibre broadband at CM3 8DY?

Full fibre availability at CM3 8DY is being updated. Check Openreach for the latest rollout status.

Area suitability scores

CM3 8DY

Remote Worker

50

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

Rettendon

District

Chelmsford

Region

Constituency

LSOA

E01034087

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