CM21 postcode
Broadband in CM21 0DB
Sawbridgeworth, East Hertfordshire
Gigabit broadband is available at this postcode.
Free, independent comparison · Ofcom verified data · Updated 6 March 2026
Flood Risk
High
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 CM21 0DB. 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 CM21 0DB.
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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) | 0% | 0% | 300-900 Mbps |
| Gigabit | 100% | 100% | 900-1,000 Mbps |
Speed Distribution at CM21 0DB
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: High
This postcode is in undefined — high risk of flooding from rivers and sea.
Flood Zone
Risk Level
High
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 East Hertfordshire
Most common: Band
Annual council tax estimates for , 2024/25
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CM21 0DB sits in Sawbridgeworth, part of East Hertfordshire. This guide covers broadband speeds, house prices, schools, and more. Every figure comes from verified public data sources. Use it alongside your own research when comparing areas.
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.
Looking at the full speed profile for CM21 0DB gives a better picture of what to expect. 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 CM21 0DB maps against common household needs. Most premises have superfast speeds. Remote working with video calls and cloud tools should be manageable for most households.
FWA broadband has not reached CM21 0DB yet. Satellite services like Starlink or 4G home broadband routers can fill the gap where fixed-line options are limited.
The USO guarantees every UK home at least 10 Mbps. At CM21 0DB, 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 CM21 0DB is rated High. 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 CM21 0DB 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 CM21 0DB: remote working 55/100, family 50/100, value 50/100. Remote workers may want to verify actual speeds before committing.
CM21 0DB falls within the East Hertfordshire local authority area. The immediate area is Sawbridgeworth, a distinct community within the wider district. The CM21 postcode area contains 310 postcodes on this site. Superfast broadband across CM21 ranges from 0% to 100%. CM21 0DB is above the area average of 94%.
How does CM21 0DB compare to its neighbours? CM21 0DE (0.04 miles, sawbridgeworth) has 100% superfast coverage and 94.6% gigabit. CM21 0DF (0.06 miles, sawbridgeworth) has 100% superfast coverage and 100% gigabit. CM21 9JP (0.06 miles, sawbridgeworth) has 100% superfast coverage and 100% gigabit. Coverage is broadly similar across these neighbouring postcodes.
Not every property at CM21 0DB 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.
Life in Sawbridgeworth depends on what matters to you. Broadband, transport, and local services vary by street.
Looking at the overall picture for CM21 0DB, a few things are worth highlighting. Connectivity at CM21 0DB is a strength. Strong broadband coverage gives flexibility for both working and leisure. The area scores well on that front. East Hertfordshire 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. Sawbridgeworth 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 Sawbridgeworth. 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.
CM21 0DB in Sawbridgeworth: 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 CM21 0DB
What are the broadband speeds available at CM21 0DB?
Superfast broadband (30 Mbps+) is available to 100% of premises at CM21 0DB. Ultrafast coverage is at 100%.
What is the average house price near CM21 0DB?
No recent house price data is available for CM21 0DB.
What is the flood risk for properties at CM21 0DB?
CM21 0DB has a High flood risk rating. Check Environment Agency maps for detail.
What schools are nearby in the CM21 0DB area?
School data for CM21 0DB is being updated. Check the Get Information About Schools service for the latest.
How does crime rate in CM21 0DB compare to other areas?
Crime data for this area is being updated.
How suitable is CM21 0DB for remote working?
CM21 0DB scores 55/100 for remote working suitability. Speeds may limit video-heavy workflows.
What is the mobile signal like at CM21 0DB?
4G outdoor coverage at CM21 0DB is 95%. Indoor coverage may be lower.
What is the most common energy efficiency rating near CM21 0DB?
EPC data for CM21 0DB is being updated. Check the EPC register for individual property ratings.
What is the council tax band distribution at CM21 0DB?
Council tax band information for CM21 0DB is being updated.
How accessible are GP surgeries near CM21 0DB?
GP surgery data for CM21 0DB is being updated. Check NHS.uk for the latest.
What transport links are available near CM21 0DB?
Transport data for CM21 0DB is being updated.
Is CM21 0DB a suitable area for families?
CM21 0DB scores 50/100 for family suitability. Check school and crime sections above for detail.
What is the air quality like at CM21 0DB?
Air quality data for CM21 0DB is being updated.
How far is the nearest EV charging point from CM21 0DB?
EV charging data for CM21 0DB is being updated. Check Zap-Map for the latest.
Can I get full fibre broadband at CM21 0DB?
Ultrafast broadband (100 Mbps+) reaches 100% of premises. Check Openreach and local operators for FTTP availability.
Area suitability scores
CM21 0DBRemote 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
Sawbridgeworth
District
East Hertfordshire
Region
Constituency
LSOA
E01023499
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