Comparison · Business internet
Leased line or business broadband: which connection does your business need
Last updated 25 October 2026 · 2 sources listed · Reading time about 4 minutes
Short answer
A leased line gives a dedicated, symmetrical path with a contractual service level and fast repair, at a higher cost and longer lead time. Business broadband shares capacity, is quicker and cheaper to install, and suits lighter or less critical use. Decide by how much downtime costs you, how much upload you need, and how soon you need to be online.
Who this is for: A business owner or IT manager deciding whether an office needs a dedicated leased line or a business-grade broadband service, and what the practical differences are.
What to evaluate
Cost of downtime
The more revenue or productivity depends on connectivity, the more it makes sense to pay for guaranteed repair and redundancy.
How to check: Estimate what an hour of outage costs you in lost work and sales, then compare with the premium for a stronger service level.
Symmetry and upload demand
Cloud backups, video conferencing, hosted servers and large file transfers depend on upload capacity that many broadband services limit.
How to check: Ask for the guaranteed upload rate, and tally uploads from backups, calls and any servers you run.
Contention and capacity guarantee
Shared broadband can slow when neighbours are busy, whereas dedicated lines reserve capacity for you alone.
How to check: Ask whether bandwidth is dedicated or contended and what ratio applies to shared services.
Service level and repair commitment
A promise to fix faults within a defined window, backed by credits, differs sharply from best-effort repair.
How to check: Read the service level agreement for response time, restoration time, and what compensation applies.
Installation lead time and build cost
Dedicated lines can require civil works or permissions, extending timelines and adding construction charges.
How to check: Request a survey, a written lead time, and a statement of any excess construction charges.
Static addressing and hosting needs
Running servers, remote access or mail systems may need fixed public addresses and sensible reverse-address configuration.
How to check: Ask what address blocks are included, whether more can be added, and whether the provider supports your required services.
Scalability
Needs grow, and some services can be upgraded in place whereas others require a new installation.
How to check: Ask how capacity can be increased, how fast, and whether there are contract implications.
Comparison
| Service | Good when | Watch out for |
|---|---|---|
| Dedicated leased line | Connectivity is core to operations and upload matters | Higher cost, longer installation and construction surcharges. |
| Business-grade broadband | A modest office with moderate cloud use and tight budgets | Shared capacity and slower repair than dedicated services. |
| Fibre broadband with enhanced repair | You want fast installation with improved support terms | Still shared, and upload may be limited. |
| Wireless or fixed radio link | Cabled options are unavailable or too slow to arrive | Line-of-sight constraints and weather sensitivity. |
| Dual service with automatic failover | Continuity matters but a leased line alone is not justified | Failover configuration must be tested, and diverse routes are essential. |
Decision worksheet
Rate up to three options against this guide’s own criteria. It runs in your browser and saves only on this device. It is a thinking aid, not a recommendation.
1. Have you checked each criterion?
0 of 7 criteria checked.
2. Compare options (0 = fails or unknown, 3 = meets it well)
| Criterion | |||
|---|---|---|---|
| Cost of downtime | |||
| Symmetry and upload demand | |||
| Contention and capacity guarantee | |||
| Service level and repair commitment | |||
| Installation lead time and build cost | |||
| Static addressing and hosting needs | |||
| Scalability | |||
| Total (max 21) | 0 | 0 | 0 |
Questions to ask before you commit
- Is the capacity dedicated to my site or shared, and what contention applies?
- What is the guaranteed upload rate as well as download?
- What are the service level terms for response and restoration, and what credits apply?
- What is the estimated lead time and are there excess construction charges?
- Which public address blocks are included and can I obtain more?
- Can capacity be upgraded without reinstallation, and does that reset my contract?
- Is the physical route into the building diverse from any backup service?
- What are the minimum term and early termination conditions?
Typical trade-offs
Dedicated line or shared service
- Upside
- Dedicated service offers predictability, symmetry and strong repair terms.
- Downside
- It costs more, takes longer to install and may be more than a small office needs.
Single strong link or two diverse links
- Upside
- Two links protect against a single point of failure.
- Downside
- Cost and complexity rise, and diversity is only real if the routes do not share infrastructure.
Long term for discounted rate or short term for flexibility
- Upside
- Longer commitments usually lower the recurring charge.
- Downside
- Office moves or growth can leave you paying for a service that no longer fits.
Common mistakes
- Choosing by download capacity alone and discovering the upload bottleneck after installation.
- Ignoring construction charges buried in the quotation.
- Assuming two providers give diverse routes when both lease the same duct.
- Not testing failover before relying on it.
- Signing a long agreement before confirming the office lease will last as long.
Related questions
What exactly is a leased line?
It is a dedicated connection between your premises and the provider's network, with capacity reserved for you rather than shared with other customers. The service is typically symmetrical, so upload equals download, and it comes with a service level agreement that specifies uptime and repair targets. The term is slightly misleading, since you are renting capacity over fibre rather than a physical wire exclusively laid for you, but the performance guarantees are the real distinction.
Is business broadband good enough for a small office?
For many small offices with email, web applications and the occasional video call, it is. Business-grade plans usually include better support and static addresses than residential ones. The concern is upload demand, repair time and shared capacity. If outages would seriously harm the business, or you host services, evaluate whether a stronger service level or a backup connection is justified.
Why do leased lines take so long to install?
They often require surveys, permissions to dig or use ducts, and sometimes physical cable laying to reach the building. Landlord consent and local authority approval can add delays. Providers should give a lead time based on a survey, and any construction needs should be disclosed upfront. Ask for the timeline and for what happens if it is missed.
What is contention ratio?
It describes how many customers share a given amount of capacity at the provider's upstream. A higher ratio means more people sharing, which can lower performance during busy periods. Dedicated services have no contention on the access path. Ask for the ratio and whether the provider guarantees minimum throughput, as a low ratio is not meaningful without a performance commitment.
Do I need a static IP address?
You need one if you host servers, allow remote access using fixed addresses, run certain VPN or mail configurations, or whitelist your office with partners. Otherwise, a dynamic address may be fine. Ask what is included and whether additional addresses are available. Understand that changing providers usually means giving up the addresses and updating any configuration that refers to them.
Sources and further reading
These pages were reachable when we last checked. They informed definitions and rules referred to above; they do not endorse this guide. Where rules differ by country, check the authority for your location.
- Consumer help center — Federal Communications Commission, retrieved 27 October 2026
- International Telecommunication Union — ITU, retrieved 27 October 2026
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