Licensing Windows 11 for a small business is simpler — and cheaper — than most owners expect. You don’t need a volume agreement, a KMS server, or an IT department. This guide covers what to buy for a team of two to twenty-five, how to deploy it without specialist help, and what it actually costs per seat.
Windows 11 Pro — £— per machine
Genuine perpetual retail keys with BitLocker, Remote Desktop and Entra ID join. Instant email delivery, one key per PC, VAT invoice included — reclaimable for UK businesses.
Buy Windows 11 Pro Windows 11 Home — £— Genuine Microsoft retail keys · Instant delivery · UK support 7 days a weekThe Short Answer
For a UK small business, the answer fits in three lines. Buy Windows 11 Pro, not Home, for any machine used for business. Buy retail licence keys — one per PC. And unless you’re licensing more than roughly twenty-five machines, skip volume licensing entirely — the administrative overhead and minimum commitments make no sense at small-business scale, and retail keys cost less per seat anyway.
Machines that arrived with Windows 11 Pro preinstalled — laptops bought direct from Dell, Lenovo, or HP with Pro specified — are already licensed and need nothing. The keys you buy are for everything else: machines running Home, self-built or refurbished PCs, and Windows 10 hardware you’re upgrading.
Which Licence Type Should a Small Business Buy?
Every Windows licence is OEM, retail, or volume, and each behaves differently when the machine it’s on is repaired, replaced, or retired. The complete guide to Windows licensing covers the mechanics in depth — here’s how the three types map to business purchasing decisions.
OEM — fine for new prebuilt hardware
When you buy new PCs with Windows 11 Pro preinstalled, that’s an OEM licence and there’s nothing wrong with it. It lives and dies with the machine — specifically the motherboard — which is acceptable for fleet hardware you’ll replace wholesale in four or five years. Just don’t expect to move it to the next machine.
Retail — the right type to buy separately
A retail key is bought independently of hardware and is transferable: deactivate on the old machine, activate on the new one. When a laptop dies out of warranty, the licence survives. For any key you buy separately from hardware, retail is the type to insist on — and it’s the only type Software Supplies sells for Windows 11.
Volume — built for organisations bigger than yours
Volume licensing exists for centralised management of large fleets: agreements to sign, portals to administer, and activation infrastructure (KMS or MAK) to think about. At five, ten, or even twenty seats, none of that earns its keep. There’s no meaningful volume discount at this scale, and a drawer full of retail keys — or a spreadsheet of them — does the same job with zero administration. Revisit volume licensing when you’re approaching twenty-five-plus machines or need centralised deployment tooling; below that, it’s complexity without benefit.
Why Pro Is the Business Baseline
The full feature comparison is in our Windows 11 Home vs Pro guide, and the edition adviser will confirm it for your situation — but for business machines the case comes down to four things:
- BitLocker drive encryption. Any machine that leaves the building carrying customer or business data should be encrypted. If a laptop is lost or stolen, BitLocker is the difference between “lost some hardware” and “lost the data on it”. It’s the practical baseline for meeting UK data protection expectations.
- Entra ID join and Intune enrolment. If you use Microsoft 365 for business, Pro machines can join your organisation’s directory and be managed centrally. Home machines can’t. Even if you don’t need this today, growing into it later requires Pro.
- Remote Desktop as a host. Letting staff connect into an office machine from elsewhere requires Pro on the machine being connected to.
- Group Policy. Enforcing settings across machines — password rules, update behaviour, USB restrictions — needs Pro. IT support providers will assume it’s there.
At £— versus £— for Home, the gap is a few pounds per machine. Against the cost of one lost unencrypted laptop, it isn’t a decision worth deliberating. If you already have Home machines in the fleet, they can be upgraded from Home to Pro without reinstalling — buy a Pro key, change the key in Settings, done.
Deploying a Small Fleet Without an IT Department
Deployment at small-business scale is per-machine work, and each machine takes well under an hour. No imaging servers, no provisioning tools — the process is the same whether you have three PCs or fifteen.
- Install or upgrade Windows. Windows 10 machines that pass the hardware check upgrade in place via Windows Update. For clean installs on new or rebuilt machines, one USB stick does every PC — our universal USB install method walks through it.
- Activate with one key per machine. Enter each machine’s key during setup, or afterwards in Settings → System → Activation. Keep a simple record of which key went to which machine — it takes minutes and saves real pain when hardware is replaced later.
- Set up accounts deliberately. For teams of two to ten without Microsoft 365, a Microsoft account per user is fine and enables licence recovery after hardware changes. If you run Microsoft 365 Business, join each machine to Entra ID during setup instead — sign in with the user’s work account when Windows asks.
- Apply a security baseline. On every machine: turn on BitLocker (Settings → Privacy & security → Device encryption or BitLocker), make each user a standard user with a separate admin account, and leave Windows Update fully enabled with active hours set to the working day.
- Reassess at twenty-five seats. When per-machine setup stops scaling — usually somewhere past twenty machines, or when a contract demands device compliance — that’s the point to look at Intune, Autopilot, and centralised management. Not before.
What It Costs Per Seat
Windows is a one-time cost per machine, and buying retail keys rather than paying Microsoft’s list price is where small businesses save. The table and chart below use today’s live prices.
| Team size | Win 11 Pro — Software Supplies | Win 11 Pro — Microsoft RRP | You save |
|---|---|---|---|
| 1 machine | — | — | — |
| 5 machines | — | — | — |
| 10 machines | — | — | — |
| 20 machines | — | — | — |
Total cost of licensing Windows 11 Pro across a fleet at today’s Software Supplies price versus Microsoft’s current RRP. Prices pulled live from the product page — see the product listing for the current figure. Both are one-time perpetual licences.
Every purchase includes a VAT invoice, and as a one-time perpetual licence it sits on the books as a straightforward capital purchase — no subscription line recurring through your P&L for the life of the machine.
The cost of staying on Windows 10 instead
Some businesses are tempted to sit on Windows 10 and lean on Microsoft’s Extended Security Updates. For business machines, that maths has turned firmly against waiting. The free consumer ESU programme excludes business-managed devices — anything domain-joined, Entra-joined, or MDM-enrolled doesn’t qualify. That leaves the paid enterprise programme, which doubles in price every year and requires late joiners to pay for the years they skipped:
| Period | Enterprise ESU per device | Cost if joining late |
|---|---|---|
| Year 1 (Oct 2025–26) | $61 | — |
| Year 2 (Oct 2026–27) | $122 | $183 cumulative |
| Year 3 (Oct 2027–28) | $244 | $427 cumulative |
By Year 3 a business has spent $427 per device keeping an obsolete OS on life support — and still has to upgrade at the end of it. A perpetual Windows 11 Pro licence costs less than a single year of ESU and solves the problem on day one. The full picture, including the October 2028 hard end date, is in our Windows 10 ESU Year 2 guide.
Common Questions From Business Buyers
Yes. Perpetual licences can be legitimately resold and transferred in the UK and EU — the legal position is well established, and we cover it in full in our guide to the legality of reselling Microsoft licence keys in the UK. The practical risk in the secondary market sits with key type and seller transparency, which is why every Software Supplies key is a genuine retail licence with a lifetime warranty and UK support behind it.
Almost certainly not. Volume licensing earns its administrative overhead somewhere beyond twenty-five machines, or when you need centralised deployment infrastructure. Below that, retail keys are cheaper per seat, simpler to manage, and transferable when hardware is replaced — which volume licences generally aren’t in practice.
One. Each Windows 11 key activates a single PC. For a ten-machine fleet you need ten keys — keep a record of which key was activated on which machine.
A retail licence moves with you: deactivate on the old machine, activate on the new one. Linking each licence to a Microsoft account makes this considerably smoother — the steps are in our guide to transferring a Windows licence to a new PC. OEM licences that came preinstalled on hardware stay with that hardware.
No. Home upgrades to Pro in place — buy a Pro key, enter it under Settings → System → Activation, and the Pro features unlock without a reinstall or data loss. See upgrading Windows 11 Home to Pro for the walkthrough.
They’re separate decisions. Windows 11 Pro is the operating system; Office is the application suite on top, and it doesn’t have to be a subscription either — perpetual Office licences are covered in our guide to Microsoft Office for UK sole traders and limited companies.
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Gary Walsh is the Head of Tech Support at Software Supplies, with more than 20 years in the IT industry. Fully Microsoft-certified and experienced across the full business software stack — from Windows and Office to cloud infrastructure and device management — Gary delivers practical, no-nonsense advice that helps users and businesses get the most from their technology.
