Comparing Leased Line Speeds: 100Mbps vs 1Gbps vs 10Gbps – A Complete Guide for UK Businesses in 2025
The foundation of modern business operations is a reliable business connection, no matter if you run a small e-commerce shop or a large-scale enterprise. We know that having leased line internet can provide the speed and stability your team needs to thrive, but choosing the right speed can be daunting.
Join us as below in comparing leased line speeds – 100Mbps, 1Gbps, and 10Gbps – so you can decide what truly suits your needs.
What Is a Leased Line?
A leased line is a dedicated internet connection that offers synchronous upload and download speeds, as well as guaranteed bandwidth, and uncontended access (you don’t share it with others like you do with standard broadband).
Essential benefits include:
- Symmetrical speeds – which is perfect for video calls, large file uploads, and cloud services
- No contention – as you get full speed 24/7
- 24/7 SLAs – which includes enterprise-level support and uptime guarantees
Comparison Table: 100Mbps vs 1Gbps vs 10Gbps Leased Lines
|
Speed |
Average Monthly Price (London) | Best For | Typical Use Cases |
Provider Link |
| 100Mbps |
£200 – £350 |
|
|
|
| 1Gbps |
£350 – £800 |
|
|
|
| 10Gbps |
£1,000 – £2,500+ |
|
|
|
Which Speed Is Right for Your Business?
100Mbps Leased Line
Suitable for startups and SMEs with <20 staff
Why would you choose 100Mbps:
- Budget-friendly
- Still powerful enough for most daily business activities
- Handles cloud-based tools, CRMs, video conferencing, and light file sharing
When to avoid 100Mbps?#:
It probably won’t be enough for you if your business heavily uses video editing, cloud backups, or shared drives
1Gbps Leased Line
Great for growing companies, remote teams, or tech-heavy SMEs
Why would you choose 1Gbps:
- Great for scaling businesses using cloud tools
- Easily supports 50+ users
- Supports VPNs, VoIP systems, 4K conferencing, and file sharing
When to avoid a 1Gbps leased line:
Rarely – this speed is becoming a sweet spot for value vs performance
10Gbps Leased Line
Great for corporates, data-heavy industries, ISPs
Why would you choose 10Gbps:
- Near-instant transfers for massive files
- Built-in redundancy
- Suitable for critical services, hosting, and large remote teams
When to avoid a 10Gbps leased line:
If your monthly data usage doesn’t justify the cost
Things to Consider Before Choosing a Speed
- Your staff size & how many devices you use
More staff = more bandwidth required, so don’t forget devices like printers, IP phones, CCTV, and smart tech.
- The software & tools you need to use
Are you using Microsoft 365, Google Workspace, Zoom, or Slack? The more cloud-based apps you rely on, the more speed you’ll need.
- Remember, upload matters too
Don’t just focus on download speeds! Remember that leased lines offer symmetrical speeds – which helps when uploading data to the cloud, hosting servers, or using VoIP.
Futureproof Your Business
As the UK continues its full-fibre rollout and more businesses adopt AI, cloud, and video-heavy tools, 1Gbps+ leased lines will become the norm, so choosing the right speed now ensures you won’t need to upgrade again in a year.
Remember – Don’t Just Look at the Price
A 1Gbps leased line may cost £400 more a year than 100Mbps – but it could save you thousands in lost productivity, downtime, and client delays.
Our Final Thoughts About Comparing Leased Line Speeds
We think that choosing the right leased line speed is about balancing cost with performance, depending on your business needs.
So for small teams, 100Mbps might be perfect, and for growing or remote-first businesses, 1Gbps is usually the safest bet… lastly, for tech giants or data centres, we think that 10Gbps is essential.
Take time to assess your needs — and remember, it’s not just about the speed, but also the support, scalability, and service level that comes with it!
Numerous leased line providers, such as BT, Virgin and TalkTalk offer speeds from 10Mb to 100Gb in Manchester. You can run a comparison by filling out the form at the top of the page today, and read more about leased lines below:
| Home |
| Leased Lines |
| BT Leased Line |
| MPLS |
| Ethernet First Mile |
| FTTP |
| Voip Phone Systems |
James Ward is CEO & Founder of Leased Line Comparison, a website founded in 2013 and has since helped over 10,000 customers. James gained his expertise in the leased line world by joining a telecoms company called Exponential-e back in 2011 which taught him everything he needed to know to set up this website today. James’ interests include horse racing, skiing, rugby, hiking, boxing and riding. He spends his time between family and friend, socialising and sport.