CM20 postcode
Broadband in CM20 3NJ
Harlow, Harlow
Gigabit broadband is available at this postcode.
Free, independent comparison · Ofcom verified data · Updated 26 March 2026
Flood Risk
Medium
Fibre (FTTP)
No
Best speed
Gigabit (1Gbps+)
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.
Gigabit broadband (Gigabit (1Gbps+)) is available at CM20 3NJ. That covers your 14 Mbps needs with room to spare.
Speed Test
Check your current download speed and see how it compares to what is available at CM20 3NJ.
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) | 100% | 100% | 100-300 Mbps |
| Full Fibre (FTTP) | N/A | N/A | 300-900 Mbps |
| Gigabit | 100% | 100% | 900-1,000 Mbps |
Speed Distribution at CM20 3NJ
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: Medium
This postcode is in undefined — medium risk of flooding from rivers and sea.
Flood Zone
Risk Level
Medium
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 Harlow
Most common: Band
Annual council tax estimates for , 2024/25
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This is the area guide for CM20 3NJ, located in Harlow. It covers connectivity, property, safety, and local services. Every claim links back to a specific data point. Read on for the detail.
Superfast coverage here stands at 100%. Nationally, 93% of UK premises have access. Coverage at this postcode is strong. 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 CM20 3NJ 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 CM20 3NJ 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 CM20 3NJ. For properties without fibre, 4G or 5G home broadband from Three, EE, or Vodafone may be an alternative.
0% of premises at CM20 3NJ fall below the Universal Service Obligation of 10 Mbps. 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 CM20 3NJ 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.
4G outdoor coverage at CM20 3NJ reaches 95%. 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 CM20 3NJ: remote working 55/100, family 50/100, value 50/100. Remote workers may want to verify actual speeds before committing.
The local authority for CM20 3NJ is Harlow. The CM20 postcode area contains 551 postcodes on this site. Superfast broadband across CM20 ranges from 0% to 100%. CM20 3NJ is above the area average of 89%.
How does CM20 3NJ compare to its neighbours? CM20 3NW (0.06 miles, harlow-unparished-area) has 100% superfast coverage and 100% gigabit. CM20 3NG (0.06 miles, harlow-unparished-area) has 80% superfast coverage and 20% gigabit. CM20 3NJ has better superfast coverage than its immediate neighbours.
Not every property at CM20 3NJ gets the same speeds. Run a postcode check with each provider before signing up. Headline speeds are not guarantees. 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 Harlow has its own feel. This data gives you the factual starting point. A visit fills in the rest.
Looking at the overall picture for CM20 3NJ, a few things are worth highlighting. Connectivity at CM20 3NJ is a strength. Strong broadband coverage gives flexibility for both working and leisure. The area scores well on that front. Harlow 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. Harlow 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 CM20 3NJ. 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.
CM20 3NJ in Harlow: 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 CM20 3NJ
What are the broadband speeds available at CM20 3NJ?
Superfast broadband (30 Mbps+) is available to 100% of premises at CM20 3NJ. Ultrafast coverage is at 100%.
What is the average house price near CM20 3NJ?
No recent house price data is available for CM20 3NJ.
What is the flood risk for properties at CM20 3NJ?
CM20 3NJ has a Medium flood risk rating. Check Environment Agency maps for detail.
What schools are nearby in the CM20 3NJ area?
School data for CM20 3NJ is being updated. Check the Get Information About Schools service for the latest.
How does crime rate in CM20 3NJ compare to other areas?
Crime data for this area is being updated.
How suitable is CM20 3NJ for remote working?
CM20 3NJ scores 55/100 for remote working suitability. Speeds may limit video-heavy workflows.
What is the mobile signal like at CM20 3NJ?
4G outdoor coverage at CM20 3NJ is 95%. Indoor coverage may be lower.
What is the most common energy efficiency rating near CM20 3NJ?
EPC data for CM20 3NJ is being updated. Check the EPC register for individual property ratings.
What is the council tax band distribution at CM20 3NJ?
Council tax band information for CM20 3NJ is being updated.
How accessible are GP surgeries near CM20 3NJ?
GP surgery data for CM20 3NJ is being updated. Check NHS.uk for the latest.
What transport links are available near CM20 3NJ?
Transport data for CM20 3NJ is being updated.
Is CM20 3NJ a suitable area for families?
CM20 3NJ scores 50/100 for family suitability. Check school and crime sections above for detail.
What is the air quality like at CM20 3NJ?
Air quality data for CM20 3NJ is being updated.
How far is the nearest EV charging point from CM20 3NJ?
EV charging data for CM20 3NJ is being updated. Check Zap-Map for the latest.
Can I get full fibre broadband at CM20 3NJ?
Ultrafast broadband (100 Mbps+) reaches 100% of premises. Check Openreach and local operators for FTTP availability.
Area suitability scores
CM20 3NJRemote 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
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Area info
Parish
Harlow
District
Harlow
Region
Constituency
LSOA
E01021852
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