Outsourced IT Support in London: A 2026 Buyer's Guide

At some point most growing firms have the same conversation: the office manager is drowning in password resets, the directors are making security decisions by gut feel, and somebody says “should we just outsource the IT?”

Usually yes — but the market makes it needlessly hard to work out what you would actually be buying, and from whom. So here is the guide we wish existed: what outsourced IT support costs in London in 2026, the three models on offer, and how to tell a good provider from a good brochure.

The Honest Cost Comparison

Start with the alternative. A capable in-house IT manager in London costs £55,000–75,000 a year before employer’s NI, pension, training and holiday cover — call it £70,000–90,000 all-in. They will be excellent at some things, unavailable when they are ill, and one person deep on a discipline that now spans networking, cloud, security and compliance.

Outsourced support for a typical 10–50 person firm runs £60–150 per user per month depending on depth — from helpdesk-only at the bottom to fully managed with security, compliance evidence and strategic input at the top. A 20-person firm therefore pays roughly £14,000–36,000 a year — a fraction of one salary, for a whole team’s coverage.

That is the arithmetic. The catch is that the market hides three very different products behind the same phrase.

The Three Models (and Who Each Suits)

1. Break-fix. You call when something breaks; they bill by the hour. Cheapest month-to-month, and the incentives are exactly backwards — the provider earns more when your IT fails. Defensible for a five-person firm with simple needs. Above that, false economy.

2. Fully managed. A fixed monthly retainer covers unlimited support, monitoring, patching, security and usually a named engineer. The provider profits by preventing problems, which is the incentive you want. This is what most people mean by managed IT support, and it is the right default for firms of 10–500 people.

3. Co-managed. You keep an internal IT person or team; the provider supplies the helpdesk overflow, the specialist security work, and the out-of-hours cover. Common from ~75 seats up, or in regulated firms where an internal lead owns the relationship with a fractional CTO layered on top for strategy.

Ten Questions That Sort the Field

Brochures converge; answers do not. Ask every shortlisted provider:

1. What is your average first-response time — measured, not promised? (Ours is 12 minutes; anyone who cannot quote a number is not measuring it.)
2. Where is the helpdesk? UK-based engineers cost more and are worth it when your team is losing billable hours to a queue.
3. Do we get a named engineer, or a ticket lottery?
4. What is in the fixed fee, precisely? On-site visits? Projects? Out-of-hours? The classic bait is a low headline fee with everything interesting billed on top.
5. What is the contract term, and what does leaving look like? Rolling 30-day terms exist — we run on them — and providers confident in their service do not need three-year handcuffs.
6. Are you certified in what you sell us? A provider recommending Cyber Essentials should hold it themselves.
7. Which sectors do you actually know? Support for a law firm or a hedge fund involves regulatory context a generalist will learn at your expense.
8. What happens out of hours? “Emergency line” can mean an engineer or an answering machine. Ask who picks up at 6:47am.
9. How do you report? You should see response times, patch status and open risks quarterly, in English, without asking.
10. Can we speak to two clients our size? The pause before the answer is data.

Red Flags Worth Walking Away From

• Onboarding is free and instant. Proper onboarding — documenting your environment, fixing inherited risks, setting baselines — takes weeks. Instant means they will learn your network live, during your incidents.
• Everything is possible, nothing is written down. If the service scope will not survive being put in a document, it will not survive a dispute either.
• Security is an upsell menu. Patching, MFA and backup checks belong inside a managed service, not on a bolt-on price list. (Genuinely advanced needs — a 24/7 SOC, penetration testing — are fairly priced separately.)
• They never say “that’s not worth paying for.” A provider who always recommends spending more is a sales team with a toolbox.

Making the Switch Without the Drama

The fear that keeps firms with mediocre providers is the migration. Reasonably: badly run handovers are miserable. Run properly, the incumbent hands over documentation and admin credentials, the new provider shadows for a settling-in period, and your staff notice nothing except that tickets started getting answered. We wrote a step-by-step guide to switching IT provider covering notice periods, data handover and the questions to ask on both sides.

The Bottom Line

Outsourced IT in London is a buyer’s market if you know what to ask. The arithmetic favours outsourcing well before the 20-seat mark; the model should almost always be fully managed on a fixed fee; and the ten questions above will eliminate most of the field faster than any comparison site.

If you would like to see how we answer them — including the awkward ones — book a free 30-minute chat or read what is included in our London IT support service. Bring your current contract; we will happily tell you if it is actually fine.