CM4 postcode
Broadband in CM4 9BL
Stock, Chelmsford
Superfast broadband covers 100% of premises here.
Free, independent comparison · Ofcom verified data · Updated 13 March 2026
Flood Risk
Low
Fibre (FTTP)
No
Best speed
~30 Mbps
Speed Calculator
Adjust the options below to see how much broadband speed your household needs.
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.
The best available speed at CM4 9BL is ~30 Mbps. That covers your 14 Mbps estimate.
Speed Test
Check your current download speed and see how it compares to what is available at CM4 9BL.
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)
| Technology | Available | Coverage | Typical Speed |
|---|---|---|---|
| Standard (ADSL) | 100% | 100% | 10-20 Mbps |
| Superfast (30+ Mbps) | 100% | 100% | 30-80 Mbps |
| Ultrafast (100+ Mbps) | 0% | 0% | 100-300 Mbps |
| Full Fibre (FTTP) | N/A | N/A | 300-900 Mbps |
| Gigabit | 0% | 0% | 900-1,000 Mbps |
Speed Distribution at CM4 9BL
Source: Ofcom Connected Nations 2025
Mobile coverage
4G & 5G coverage · Ofcom Connected Nations 2025
4G Outdoor
4G Indoor
5G Outdoor
Networks with 4G
Schools nearby
Nearest schools within 5 miles · Ofsted ratings as at Jan 2026
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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
Air quality
Particulate matter & nitrogen dioxide levels
air quality
Air quality data not available.
WHO guideline: 15 μg/m³
WHO guideline: 45 μg/m³
WHO guideline: 25 μg/m³
Transport links
Nearest train stations and towns
Nearest train stations
No train stations found within 15 miles
Council tax bands
Band distribution for Chelmsford
Most common: Band
Annual council tax estimates for , 2024/25
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Looking at CM4 9BL in Stock? Here is what the data says. From broadband coverage to crime rates, this is the full picture. All numbers are from official sources. The guide is updated as new data becomes available.
Superfast coverage here stands at 100%. Nationally, 93% of UK premises have access. Coverage at this postcode is strong.
The speed distribution at CM4 9BL tells a more detailed story than headline figures alone. 100% 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.
Translating the numbers at CM4 9BL 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 CM4 9BL. 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 CM4 9BL, 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 CM4 9BL 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 CM4 9BL 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 CM4 9BL: remote working 55/100, family 50/100, value 50/100. Remote workers may want to verify actual speeds before committing.
CM4 9BL falls within the Chelmsford local authority area. The immediate area is Stock, a distinct community within the wider district. The CM4 postcode area contains 417 postcodes on this site. Superfast broadband across CM4 ranges from 0% to 100%. CM4 9BL is above the area average of 91%.
How does CM4 9BL compare to its neighbours? CM4 9BH (0.02 miles, stock) has 100% superfast coverage and 0% gigabit. CM4 9BN (0.03 miles, stock) has 100% superfast coverage and 0% gigabit. CM4 9NJ (0.03 miles, stock) has 100% superfast coverage and 0% gigabit. CM4 9BJ (0.04 miles, stock) has 100% superfast coverage and 0% gigabit. Coverage is broadly similar across these neighbouring postcodes.
Broadband availability varies by provider and by property. At CM4 9BL, 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.
Life in Stock depends on what matters to you. Broadband, transport, and local services vary by street.
Pulling the data together for CM4 9BL, here is what stands out. Connectivity at CM4 9BL 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. Stock 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 CM4 9BL. 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.
That is the full data picture for CM4 9BL in Stock. 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 CM4 9BL
What are the broadband speeds available at CM4 9BL?
Superfast broadband (30 Mbps+) is available to 100% of premises at CM4 9BL.
What is the average house price near CM4 9BL?
No recent house price data is available for CM4 9BL.
What is the flood risk for properties at CM4 9BL?
CM4 9BL has a Low flood risk rating. Check Environment Agency maps for detail.
What schools are nearby in the CM4 9BL area?
School data for CM4 9BL is being updated. Check the Get Information About Schools service for the latest.
How does crime rate in CM4 9BL compare to other areas?
Crime data for this area is being updated.
How suitable is CM4 9BL for remote working?
CM4 9BL scores 55/100 for remote working suitability. Speeds may limit video-heavy workflows.
What is the mobile signal like at CM4 9BL?
4G outdoor coverage at CM4 9BL is 95%. Indoor coverage may be lower.
What is the most common energy efficiency rating near CM4 9BL?
EPC data for CM4 9BL is being updated. Check the EPC register for individual property ratings.
What is the council tax band distribution at CM4 9BL?
Council tax band information for CM4 9BL is being updated.
How accessible are GP surgeries near CM4 9BL?
GP surgery data for CM4 9BL is being updated. Check NHS.uk for the latest.
What transport links are available near CM4 9BL?
Transport data for CM4 9BL is being updated.
Is CM4 9BL a suitable area for families?
CM4 9BL scores 50/100 for family suitability. Check school and crime sections above for detail.
What is the air quality like at CM4 9BL?
Air quality data for CM4 9BL is being updated.
How far is the nearest EV charging point from CM4 9BL?
EV charging data for CM4 9BL is being updated. Check Zap-Map for the latest.
Can I get full fibre broadband at CM4 9BL?
Full fibre availability at CM4 9BL is being updated. Check Openreach for the latest rollout status.
Area suitability scores
CM4 9BLRemote Worker
55Based on superfast broadband coverage, FTTP %, and 4G mobile outdoor coverage.
Family
50Based on Ofsted school ratings, crime rate, flood risk, and GP surgery proximity.
Value for Money
50Based on broadband quality relative to average house price in the area.
Map
Area info
Parish
Stock
District
Chelmsford
Region
Constituency
LSOA
E01034086
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