100Gb Leased Line UK 2026: Costs, Providers, DIA & Enterprise Ethernet Quotes Quick answer:
A 100Gb leased line is a dedicated enterprise-grade internet connection that can deliver up to 100Gbps symmetrical bandwidth for organisations with extremely high data, cloud, hosting, research, media, financial, AI or multi-site connectivity needs.
It is not a normal business broadband product.
A 100Gb leased line is usually considered by:
data centres
cloud service providers
universities and research organisations
financial services firms
media and broadcast companies
large SaaS businesses
AI and data-heavy organisations
multi-site enterprises
network operators
businesses moving huge files or datasets
organisations needing very high-capacity dedicated internet
Typical UK 100Gb leased line pricing is usually quote-based, and, as a broad guide, businesses may see indicative monthly costs from around:
Location or requirement Typical monthly cost guide
Well-connected city or data-centre area
£2,000-£5,000+
Large office or enterprise site
£5,000-£8,000+
Complex suburban installation
£5,000-£10,000+
Rural, remote or new fibre build
£8,000-£10,000+
High-resilience or diverse routing
Quote-based
Wavelength, dark fibre or specialist high-capacity service
Quote-based
Many businesses searching for 100Gb should also compare 10Gb leased lines, 100Gb bearer options, wavelength services, dark fibre, high-capacity Ethernet and managed WAN solutions .
Compare 100Gb Leased Line Quotes
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How do we work?
Transparent, impartial, and data‑driven reviews made by a team of expert humans, never AI generated – here’s exactly how Compare Your Business Costs helps you find the best deals from trusted UK providers: click here
Authored by: Ally Cox (Business Technology & B2B Services Specialist 10+ Years’ Experience)
Reviewed by: James Ward (Telecoms Specialist, 12+ Years Experience)
Last Updated: August 2026
Compare enterprise leased line quotes Use this guide if you are comparing:
100Gb leased lines
100Gbps dedicated internet
100Gb DIA
100Gb Ethernet
enterprise leased lines
data-centre connectivity
wavelength services
dark fibre
high-capacity services
10Gb vs 100Gb leased lines
100Gb bearer options
multi-site enterprise internet
dedicated cloud connectivity
resilient leased line circuits
carrier-grade business internet
Leased Line Cost Calculator UK Estimate your monthly leased line cost, annual spend, total contract value and whether dedicated internet is likely to be worth comparing for your business.
Required leased line speed
100Mbps 200Mbps 500Mbps 1Gbps 2Gbps 10Gbps Choose the committed speed your business needs.
Bearer size
100Mbps bearer 1Gbps bearer 10Gbps bearer A larger bearer can make future speed upgrades easier.
Business usage
Standard office use VoIP, video calls and cloud software Heavy uploads, backups or large files Critical operations / cannot trade offline Enterprise, data-heavy or multi-site Higher usage may increase recommended resilience and speed.
Location type
City / strong network availability Town / mixed availability Rural / limited availability Business park / complex install Leased line pricing is highly postcode-specific.
Contract length
12 months 24 months 36 months 60 months Longer contracts usually reduce the monthly price.
Resilience requirement
No extra resilience 4G/5G or broadband backup Diverse backup circuit Useful if downtime would stop trading.
SLA requirement
Standard business SLA Enhanced SLA / faster fix Critical SLA / maximum uptime focus Higher SLA expectations can affect provider choice.
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100GB Leased Line: Compare Providers, Costs & Best UK Deals
Contents
What is a 100Gb Leased Line?
Best UK Providers
Benefits of 100Gb Leased Lines
Average Costs of 100Gb Leased Lines
Factors Affecting Pricing
Who Should Consider a 100Gb Leased Line?
How to Choose the Best Provider
FAQS About 100GB Leased Lines
Key takeaways
100Gb leased lines are designed for enterprise, data-heavy and mission-critical connectivity.
Pricing is almost always quote-based because installation and network availability vary significantly.
100Gb connectivity may be available as Dedicated Internet Access, Ethernet, wavelength, high-capacity fibre or carrier-grade services.
Most SMEs do not need a 100Gb leased line.
Many businesses should compare 1Gb, 10Gb and 100Gb options before deciding.
A 100Gb leased line may require specialist routers, optics, firewalls and internal network upgrades.
Installation can take longer than standard leased lines, especially where new fibre build, wayleaves or diverse routing are needed.
Enterprise buyers should compare SLA, resilience, routing, carrier network, install lead time and total contract value.
Providers to compare include Colt, BT, Virgin Media Business, Vodafone, Neos Networks, GTT, Lumen, euNetworks, CityFibre partners and specialist enterprise carriers.
What is a 100Gb Leased Line? A 100Gb leased line is a dedicated fibre connection that can deliver up to 100 gigabits per second of bandwidth, and is usually:
dedicated to one organisation
symmetrical, with matching upload and download capacity
SLA-backed
uncontended
suitable for very high data throughput
quote-based
subject to site survey
installed with enterprise-grade equipment
often used with resilient routing or backup circuits
A 100Gb leased line is different from standard business broadband, FTTP and most SME leased lines – it sits at the high-capacity enterprise end of the market.
100Gb leased line vs 10Gb leased line
For many organisations, the real decision is not “do we need a leased line?” but “do we need 10Gb or 100Gb?”
Feature 10Gb leased line 100Gb leased line
Bandwidth
10Gbps
100Gbps
Best for
Larger offices, SaaS, media, cloud-heavy businesses
Data centres, carriers, research, AI, broadcast and high-capacity enterprise
Cost
Lower
Much higher
Installation
Enterprise, but more common
More specialised
Hardware
10Gb-capable router/firewall/switching
100Gb-capable infrastructure required
Internal network impact
Significant
Major
Overkill risk
Medium
High unless data-heavy
Typical buyer
Large SME or enterprise
Enterprise, data centre, carrier or high-volume data organisation
100Gb leased line vs 100Gb bearer A lot of businesses do not need 100Gb of committed bandwidth immediately, but you could need a high-capacity bearer that allows future upgrades.
Option What it means Best for
10Gb circuit
Up to 10Gbps service
Large businesses needing high bandwidth now
10Gb on larger bearer
Lower committed speed with upgrade path
Businesses expecting growth
100Gb bearer
Network capacity up to 100Gbps
Enterprises planning future high-capacity needs
100Gb committed service
Full 100Gbps service
Data-heavy organisations using very high capacity now
Providers that may offer 100Gb enterprise connectivity
Provider Why compare it?
Colt
Dedicated Internet Access up to 100Gbps and strong enterprise network footprint
BT Business / BT Wholesale
UK enterprise connectivity and Ethernet access services
Virgin Media Business
DIA up to 100Gbps as a non-standard option and high-capacity services
Vodafone Business
Enterprise connectivity and national network services
Neos Networks
High-capacity fibre and enterprise connectivity
GTT
Global enterprise network and internet access
Lumen
Enterprise network, cloud and high-capacity connectivity
euNetworks
Fibre and bandwidth infrastructure in major European markets
CityFibre partners
Alternative fibre network options in covered areas
Zayo
Fibre, wavelength and high-capacity network services
Specialist telecoms brokers
Useful for comparing carrier availability and pricing
Benefits of 100Gb Leased Lines
100Gbps symmetrical speeds ensure seamless uploads and downloads , no matter the task at hand. Your business also gets its own private line , guaranteeing consistent performance and zero bandwidth sharing. The private nature of leased lines r educes the risk of cyber threats or data breaches. As your business grows, you can scale bandwidth without compromising performance. SLAs ensure high uptime and rapid response times for technical issues. These lines are perfect if you use cloud services or host large-scale virtual environments.
How Much does a 100Gb Leased Line Cost? 100Gb leased line pricing is usually bespoke, but indicative monthly ranges can include:
Scenario Typical monthly cost guide
City-centre site near major fibre networks
£2,000-£5,000+
Enterprise office or campus
£5,000-£8,000+
Suburban business park
£5,000-£10,000+
Rural or complex site
£8,000-£10,000+
Diverse routing or dual circuits
Quote-based
Data-centre cross-connect or high-capacity service
Quote-based
Wavelength or dark fibre
Quote-based
These figures are only a guide nd your final quote can change significantly depending on:
postcode
carrier availability
distance to fibre
excess construction charges
wayleaves
whether the building is already fibre-enabled
required bandwidth
bearer size
resilience
diverse routing
hardware
SLA
contract length
installation complexity
whether the service is internet access, Ethernet, wavelength or dark fibre
Compare multiple quotes before committing.
Compare 100Gb Leased Line Prices
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Why 100Gb leased line prices vary so much
100Gb connectivity is more location-sensitive than standard business broadband and your costs can be affected by:
Fibre availability
If fibre is already in the building or nearby, costs may be lower but if new fibre construction is needed, installation costs can rise sharply.
Distance to network
The further your site is from suitable carrier infrastructure, the more expensive the build may be.
Resilience requirements
A single 100Gb circuit is different from two diversely routed 100Gb circuits – remember, resilience can significantly increase cost.
Service type
A 100Gb internet service is not always priced the same as Ethernet, wavelength, dark fibre or private cloud connectivity.
Hardware and security
Your internal network may need 100Gb-capable:
routers
switches
firewalls
optics
cross-connects
monitoring
DDoS protection
load balancing
cabling
rack space
power
Contract length
Longer contracts can reduce monthly pricing but increase total commitment – for 100Gb services, total contract value can be very high, so compare carefully.
When does a business need a 100Gb leased line? A 100Gb leased line could be worth comparing if your organisation:
operates data centres
hosts cloud services
moves very large datasets
streams or distributes high-volume media
supports AI, machine learning or high-performance computing workloads
handles large-scale backups and replication
connects multiple enterprise sites
runs latency-sensitive trading or analytics platforms
supports thousands of users
provides managed services or hosting
needs major cloud or peering capacity
has outgrown 10Gb connectivity
needs resilient high-capacity circuits
For most offices, call centres, retail groups and SMEs, 100Gb is likely to be excessive .
In those cases, compare 1Gb, 2Gb, 10Gb or scalable bearer options first.
Who does not need 100Gb? Most organisations do not need a 100Gb leased line – if you are the following, it’s probably too much:
small offices
normal VoIP use
everyday cloud software
Microsoft Teams calls
standard ecommerce websites
standard business broadband users
most retailers
most hospitality businesses
most professional services firms
small SaaS teams
single-site SMEs
basic backup needs
If your business mainly needs reliable internet for phones, cloud software, video calls, EPOS or customer Wi-Fi, compare FTTP, Ethernet broadband, 1Gb leased lines or 10Gb leased lines instead.
100Gb leased line alternatives
Alternative Best for Why compare it?
FTTP business broadband
SMEs needing fast, good-value broadband
Much cheaper where available
Ethernet broadband
Growing teams needing stronger performance
Good middle ground
1Gb leased line
SMEs needing dedicated connectivity
Stronger SLA at lower cost
2Gb leased line
Data-heavy SMEs
Higher capacity without 10Gb cost
10Gb leased line
Large offices and enterprises
Often enough before 100Gb
100Gb bearer with lower commit
Future growth
Allows scaling without immediate full 100Gb cost
Wavelength service
Data centres and enterprise networks
High-capacity private connectivity
Dark fibre
Maximum control
Requires internal expertise and equipment
SD-WAN / managed WAN
Multi-site resilience
Better network control and routing
Cloud connectivity
AWS, Azure or Google Cloud users
More direct cloud performance
Compare 10Gb and 100Gb Quotes
Free quotes • No obligation • Compare enterprise leased line options
How Do I Choose the Best 100Gb Leased Line Provider? When selecting a 100Gb leased line provider, consider:
✅ Network coverage – Is fibre available in your area?
✅ Pricing & contract terms – Compare multiple quotes for the best deal.
✅ SLA & reliability – Look for 99.9%-100% uptime guarantees.
✅ Customer support – Check reviews on Trustpilot, ISPreview, and Expert Market.
📌 Tip : Use our leased line comparison service to save time and money.
Our Thoughts on Having a 100GB Leased Line
We think that A 100GB leased line is particularly well-suited for organisations handling large-scale operations (including video streaming, extensive cloud computing, and data centre connectivity – amongst much more!)
So, a 100GB leased line really could be a game-changer if you require fast, reliable, and secure connectivity, and while the cost can be daunting, we think it has the potential to be a high-capacity solution and an investment in your busine ss’s future.
FAQS About 100GB Leased Lines What is a 100Gb leased line?
A 100Gb leased line is a dedicated enterprise-grade fibre connection that can deliver up to 100Gbps symmetrical bandwidth for organisations with very high data needs.
How much does a 100Gb leased line cost in the UK?
100Gb leased line pricing is usually quote-based. As a broad guide, monthly costs may range from around £2,000 to £10,000+ depending on location, fibre availability, install complexity, resilience, SLA and contract length.
Who needs a 100Gb leased line?
Typical users include data centres, cloud providers, universities, research organisations, media and broadcast firms, financial services, AI workloads, SaaS platforms and large multi-site enterprises.
Is 100Gb overkill for most businesses?
Yes. Most businesses do not need 100Gb. Many would be better comparing FTTP, 1Gb leased lines, 10Gb leased lines or scalable bearer options.
Which providers offer 100Gb leased lines?
Providers that may offer 100Gb enterprise connectivity include Colt, BT, Virgin Media Business, Vodafone, Neos Networks, GTT, Lumen, euNetworks, Zayo and specialist enterprise carriers. Availability depends on postcode and network footprint.
Is a 100Gb leased line the same as dark fibre?
No. A leased line is a managed connectivity service. Dark fibre is usually unlit fibre where the customer or provider manages the optical equipment. Dark fibre offers more control but requires more expertise.
Is a 100Gb leased line the same as wavelength?
No. Wavelength services provide high-capacity optical transport between sites. A 100Gb leased line usually refers to dedicated internet or Ethernet access, while wavelength is often used for private high-capacity connectivity.
How long does a 100Gb leased line take to install?
Installation can take 60 to 150+ days depending on site survey, wayleaves, fibre availability, construction requirements, hardware and route diversity.
Can I upgrade from 10Gb to 100Gb?
Yes, in some cases. Whether you can upgrade depends on bearer size, provider network capacity, equipment, fibre availability and contract terms.
What hardware do I need for 100Gb?
You may need 100Gb-capable routers, switches, firewalls, optics, cabling, rack capacity, power, monitoring and DDoS protection. Hardware costs should be included in the comparison.
Should I choose 10Gb or 100Gb?
Choose 10Gb if you need high-capacity enterprise connectivity but do not have proven 100Gb demand. Choose 100Gb if your data, cloud, AI, hosting or multi-site workloads genuinely require that level of throughput.
What should I compare before ordering?
Compare monthly cost, install cost, bearer size, committed bandwidth, SLA, resilience, handoff, hardware, lead time, total contract value, upgrade options and provider network coverage.
Compare 100Gb Leased Line Quotes Compare 100Gb DIA, Ethernet, wavelength, dark fibre and high-capacity enterprise connectivity options from UK providers.
Free quotes • No obligation • Compare UK enterprise connectivity providers
Compare Enterprise Leased Line Quotes
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Hi, I’m Ally Cox , a senior copywriter and blogger at CompareYourBusinessCosts.co.uk, the UK’s trusted platform for comparing business services.over a decade of experience in the B2B sector, I specialise in simplifying complex topics like leased lines, VoIP, business energy, HR and payroll solutions, accounting software, and EPOS systems .HR, copywriting, and business operations- from clocking-in systems to card machines and office technology .informed, confident decisions when choosing products and services that improve efficiency and save money.
