In short
The broadband speed your business needs depends on what runs at the same time in your busiest hour: video calls, cloud apps, phone calls, backups, CCTV and guest Wi-Fi. Upload speed often matters more than download. Standard Fibre suits light use, Full Fibre suits most growing offices, and a leased line suits heavy, symmetrical use.
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Start with what you do, not a number
Speed charts that promise a figure "per user" are tempting, but they hide the things that actually decide whether a connection copes: how many activities happen at once, how much of that traffic goes out rather than in, and how much the business suffers if things slow down. Two ten-person offices can need very different lines. One runs email and cloud accounts software; the other edits video and backs up to the cloud every evening.
So rather than invent a per-user figure, this guide works the other way round: list what your business does, work out which of those things happen together, check whether they lean on download or upload, and then choose a tier with headroom. If you would rather we did that with you, contact us and we can go through it as part of a quote.
Download and upload: know which one you need
Download is everything coming in: web pages, cloud apps, video streams, file downloads, software updates. Upload is everything going out: emails with attachments, files saved to cloud storage, backups, your camera on a video call, CCTV footage sent off site and every IP phone call.
On broadband, upload is the smaller number. On BT's tiers, Standard Fibre 76 gives up to 19Mbps upload, while Full Fibre runs from up to 29Mbps on 150 to up to 104Mbps on 900 (see BT Business Broadband speeds for the full table). Many small businesses run short of upload before they run short of download, and when upload is saturated everything feels slow, including calls and web browsing, because the acknowledgements that keep downloads moving are queued behind the outgoing traffic.
Sizing by use
The table sets out common business uses, which direction they lean, and what to think about. It is a planning aid rather than a formula: the software you use publishes its own bandwidth guidance, and that is the figure to plan with.
| Use | Leans on | What to think about |
|---|---|---|
| Email, web and cloud office apps | Download, light | Many users at once, and large attachments going out |
| Video meetings | Both, upload matters | How many meetings run at the same time at your busiest hour |
| Cloud phones (VoIP) | Both, small but sensitive | Stability and spare upload matter more than raw speed |
| Cloud backup and file sync | Upload, heavy | When it runs, and whether it competes with the working day |
| Design, video, imaging and large files | Upload, heavy | The size of files you send and how quickly you need them there |
| CCTV viewed or stored off site | Upload, continuous | Number of cameras streaming out at once |
| Card payments and EPOS | Light | Reliability and backup matter more than speed |
| Guest Wi-Fi | Download, variable | BT keeps 80% of the available speed for the business on its guest Wi-Fi |
| Remote access, VPNs and hosted servers | Upload | People connecting in from outside download through your upload |
For voice, BT gives a published rule of thumb for BT Cloud Voice: allow at least 120 kbps of upload for each call you expect to be on at the same time, and use no more than 80% of the connection for voice and data together. The detail is on our sister site's BT Cloud Voice internet connection guide, and our broadband for VoIP guide covers router settings and backup.
Not sure which plan fits? Ask us
Tell us what you need and we will recommend the right plan for your organisation, with a quote.
Measure what you use now
If you already have a connection, real data beats guesswork:
- Note when things feel slow. Days, times and what people were doing. The pattern usually points to one activity, such as a backup running at lunchtime.
- Test the line properly over a cable at busy and quiet times; our speed test guide shows how. If the line is below what it should deliver, that is a fault to report, not a reason to buy more speed.
- Look at usage by device. On BT Business Broadband Pro, the Wi-Fi Security Controls dashboard shows device usage, and on BT Ultra Broadband the Cisco Meraki dashboard shows device, application and usage statistics.
- List what is coming. New staff, a move to cloud phones, more cameras, cloud backup replacing a local server: each of these changes the answer.
The aim is to cover the busiest realistic hour over the length of the contract with some headroom left over, not to buy the biggest tier in case.
Matching needs to BT tiers
With your list in hand, these are the starting points we use when advising. Your address decides which are available, and the minimum guaranteed speed BT gives for each tier at your premises is the figure to plan with.
| Your situation | Where to start | Notes |
|---|---|---|
| One or two people, email, web, cloud apps, occasional video calls | Standard Fibre 38 or 76, or an entry Full Fibre tier | Copper (up to 17Mbps) only if nothing else reaches you |
| Small office, regular video calls, cloud phones, some file sharing | Standard Fibre 76 or Full Fibre 100 to 300 | Check the upload figure first |
| Growing office, cloud backup, design or imaging files, CCTV off site | Full Fibre 300 to 900 | Upload rises with each Full Fibre tier |
| Security-led business that wants managed firewall and backup built in | BT Ultra Broadband on Standard Fibre 76 or Full Fibre up to 900 | Same access speeds; adds managed Cisco Meraki security |
| Very heavy use, matching upload and download, dedicated bandwidth | A leased line | See our leased line guide |
BT's business pages also list Full Fibre Gigabit and Full Fibre 1.6 Gigabit plans at some addresses. If you are considering one, read gigabit business broadband first: for many offices the upload figure and the Wi-Fi inside the building limit the benefit before the line does.
Is BT Business Broadband the right fit for you?
We will check it against your systems and requirements and recommend the right option.
Working from home and home workers
BT says you can have business broadband at home if you run your business from there. The same sizing logic applies to a home office, with two extra points: the household shares the connection, so a family streaming in the evening competes with a late video call, and home Wi-Fi often has to reach a spare room or garden office at the far end of the house.
For many home-based businesses, reliability and support matter as much as speed. A static IP for remote access, Hybrid Backup for 4G backup and BT's business fault-fix targets are worth checking when you compare plans. See business broadband at home and business broadband vs home broadband.
Speed is not the only thing to buy
A faster tier will not help if the line goes down, if the Wi-Fi does not reach the back office, or if a fault takes days to fix. Before spending on the next tier, check these:
- Backup: Hybrid Backup switches to 4G automatically if the fixed line fails. It is included with Enhanced and Pro.
- Wi-Fi coverage: Complete Wi-Fi Plus and Smart Hub 3 on Pro, or Meraki access points on Ultra. See business Wi-Fi.
- Fault fixing: with BT's Prompt Care, BT aims to fix faults reported before 9pm Monday to Saturday by the end of the next working day, Saturdays included. It is included with Pro and Ultra.
- The right plan: our plans comparison shows what each of Essential, Enhanced, Pro and Ultra includes.
When to look beyond broadband
If your list is dominated by upload-heavy work, many users at once, hosted services that others connect to, or a need for a stronger service level, broadband may not be the right tool at any tier. A leased line gives dedicated, symmetrical bandwidth. Our guide on when to upgrade from broadband to a leased line sets out the signs, and our sister site leased-lines.uk covers BT's BTnet leased lines, including a bandwidth sizing guide.
Tell us how your business uses its connection and we can check what your address can get, show you the estimated and minimum guaranteed speeds for each option, and recommend a plan and tier that fits, with pricing confirmed at quote. Contact us to talk it through.
Why buy BT Business Broadband from Forever Communications
Forever Communications is part of Forever Group and an Authorised Supplier for BT. We supply BT Business Broadband to businesses, schools, charities and public sector organisations, and we help with each step from first enquiry to go-live.
- The right connection for your address: we check whether your premises can get Full Fibre or another access type, and explain what that means for speed; see checking availability
- A plan that fits how you work: we help you compare BT Business Broadband plans, including BT Business Ultra, and decide which add-ons such as Hybrid Backup or a static IP are worth having
- A clear quote: charges, minimum term and what is included set out in writing; see what affects the price
- Installation planned with you: we explain what happens before and on the day; see BT Business Broadband installation
- Connected services in one conversation: phones with BT Cloud Voice, Wi-Fi and security, or a BTnet leased line when broadband is no longer enough
BT Business Broadband is a business service. Speeds, features, service levels and availability are BT's and are confirmed at order.
Frequently asked questions
What broadband speed does a small business need?
It depends on what runs at the same time in your busiest hour, not just headcount. Light users of email and cloud apps often manage on Standard Fibre; offices with video calls, cloud phones and backups usually benefit from Full Fibre's higher upload.
Is upload or download speed more important for business?
For many businesses, upload. Video calls, cloud backups, file sharing, CCTV and IP phones all send data out, and upload is the smaller figure on every broadband line.
What broadband speed do I need for working from home?
Size it the same way as an office: list what runs at once, including household use in the evenings, and check upload. If the business depends on it, consider business broadband with backup and business fault fixing.
Do I need 900Mbps broadband for my business?
Not necessarily. Many small offices are limited by upload, Wi-Fi or devices before they use 900Mbps of download. Choose a tier that covers your busiest hour with headroom, and check what BT guarantees at your address.
How much bandwidth do VoIP calls need?
For BT Cloud Voice, BT's rule of thumb is at least 120 kbps of upload per simultaneous call, using no more than 80% of the connection for voice and data together. Other services publish their own figures.
When is broadband not enough for a business?
When you need matching upload and download, dedicated bandwidth, or a stronger service level than broadband offers. That is when a leased line is worth pricing.
Still have a question about BT Business Broadband?
Ask us and a member of our team will reply by email.