Managed IT support vs in-house IT vs break-fix

Somewhere between "the founder's nephew fixes the printer" and "we have a full internal IT department," every growing business has to decide how it actually wants IT support to work. Get it right early and it barely gets discussed again. Get it wrong, and it becomes the recurring meeting nobody enjoys, the outage that costs a day of trading, or the hire that never quite covers what you needed.

In short: Break-fix IT (paying only when something breaks) is the cheapest model on paper but the most expensive in practice once outages, security gaps and lost productivity are counted. In-house IT gives you dedicated, embedded knowledge but is limited by one team's skills, headcount and availability. Managed IT support trades some of that direct control for predictable cost, broader specialist coverage and proactive prevention rather than reactive fixing. For a growing business in the 15-250 seat range, the model that fits usually shifts as headcount grows, and increasingly, the answer for larger teams in that range is a co-managed mix of the two rather than picking one exclusively.

This comparison is written specifically for that 15-250 seat range, because it's the range where the "obvious" answer actually changes. A 15-seat business and a 250-seat business are choosing between genuinely different trade-offs, even though both might describe their problem the same way: "our IT support isn't working the way we need it to."

The three models, in plain terms

Managed IT support

A managed service provider takes ongoing, contracted responsibility for some or all of your IT estate, monitoring, patching, security, service desk, and (where agreed) strategic input, for a predictable recurring cost. The relationship is proactive by design: the provider is paid to prevent problems as much as to fix them, through practices like scheduled, owned patch management and identity-based Conditional Access controls, and typically carries a broader bench of specialist skills across security, cloud, networking and infrastructure than a single internal hire realistically can.

In-house IT

You directly employ the people responsible for your IT, whether that's one generalist wearing every hat or a small internal team split across specialisms. The advantage is deep, embedded knowledge of your business, its people, its quirks and its priorities, built up over time by people who work only for you. The constraint is capacity: one person, or even a small team, has finite hours, finite specialist knowledge, and finite availability outside normal working hours, all of which have to be planned around rather than assumed away.

Break-fix

No ongoing contract. You call an IT company (or manage it internally, ad hoc) when something breaks, pay for that specific piece of work, and there's no relationship or coverage in between incidents. It looks like the cheapest option because there's no baseline monthly cost, but nothing is being monitored, patched proactively or protected until a problem has already happened, which shifts cost from a predictable line item into unpredictable downtime, data loss risk and emergency call-out pricing.

Cost predictability

This is where the three models genuinely differ, not just in amount but in shape. Managed IT support is built around a predictable, typically per-user or per-device, recurring cost that's straightforward to budget against and scale as headcount changes. In-house IT looks predictable too, on the surface it's a salary, or a small team's combined salaries, but the real cost is less stable than it looks: training, tooling, recruitment when someone leaves, and the gap in coverage while a role sits vacant all add variable cost that doesn't show up in the base salary figure. Break-fix is the least predictable of all three by a wide margin. Cost tracks incidents, and incidents don't arrive on a schedule, a quiet quarter can be followed by an expensive one with no warning, and emergency, out-of-hours or urgent call-outs are typically priced at a premium precisely because they're unplanned.

Response time and coverage

Managed IT support is generally structured around defined coverage hours and a service desk built to handle volume, meaning issues are typically triaged and actioned faster simply because responding to them is the provider's core job, not a distraction from someone's other responsibilities. In-house IT response time depends entirely on who's available: a single in-house hire covers their own working hours, and anything outside that, evenings, weekends, annual leave, sick days, is a genuine coverage gap unless the business has explicitly planned for it, which many haven't. Break-fix response time is the least predictable of the three: you're not a contracted priority, you're a new job being slotted into whatever queue the provider already has, and urgent issues outside business hours are often the most expensive and slowest to resolve of any model here.

Where each model breaks down as you scale

Break-fix breaks down first

Break-fix tends to work adequately for a genuinely small operation with simple, low-risk IT needs, where an outage is inconvenient rather than costly. It breaks down quickly once a business has real dependencies: a growing customer base relying on continuous uptime, compliance obligations that require evidence of proactive security management (not just reactive fixes), or simply enough people that the cumulative cost of small, unaddressed issues starts to add up. By the time a business reaches the lower end of the 15-250 seat range, break-fix is usually already the most expensive option in practice, even though it still looks the cheapest on an invoice.

In-house breaks down next

A single in-house IT hire, or even a small internal team, tends to hold up well until the range of technical demands outgrows what that team can realistically specialise in. Security, cloud infrastructure, networking, compliance and day-to-day service desk volume are each deep enough to be a specialism on their own; expecting one generalist, or even three or four people, to be genuinely expert across all of them becomes harder to sustain the more the business (and its technology estate) grows. This is usually where the gap first becomes visible, not because the in-house team isn't good, but because the breadth of what's being asked of them has outgrown what any small team can cover alone.

Where managed IT still holds

Managed IT support scales more gracefully because the provider's job is specifically to maintain broad coverage across specialisms as client needs grow, spreading that cost and expertise across many clients rather than one. It isn't infinitely elastic either, a provider that's grown too fast or spread too thin has its own version of the in-house capacity problem, but a genuinely capable managed provider (rather than a small team of specialists stretched across too many clients) is generally the model best positioned to keep up as a business moves through and beyond the 15-250 seat range.

The full comparison

	Managed IT support	In-house IT	Break-fix
Cost shape	Predictable, recurring	Mostly predictable, hidden variable costs	Unpredictable, tracks incidents
Proactive vs reactive	Proactive by design	Depends on team capacity	Purely reactive
Specialist coverage	Broad, spread across a specialist bench	Limited to the team's own skills	Whoever's available at the time
Coverage hours	Defined, typically extends beyond office hours	Limited to the team's working hours	No guaranteed availability
Scales with growth	Generally scales well	Strained once demands outgrow the team	Breaks down early
Best suited to	Growing businesses needing broad, predictable coverage	Businesses needing deep, embedded institutional knowledge	Very small, low-dependency operations

A practical way to think about the 15-250 seat range

At the lower end of this range, the choice is usually between break-fix and managed IT support, because a dedicated in-house hire is a significant fixed cost relative to headcount, and the breadth of coverage a managed provider offers tends to outweigh what one generalist can realistically provide. In the middle of the range, businesses often already have some in-house presence, an IT lead, an office manager who's become the accidental IT contact, and the real decision is whether to keep building that internally or to bring in a managed provider to cover what internal capacity can't. At the upper end of the range, co-managed IT, an internal lead or small team working alongside a managed provider, becomes increasingly common, because the business is large enough to justify embedded, in-house knowledge of its own priorities and vendor relationships, but still benefits from a managed provider's broader specialist bench for the day-to-day volume and 24/7 coverage a small internal team can't sustain alone.

Common mistakes growing businesses make

The most common mistake is staying on break-fix for too long simply because the monthly cost looks lower, without ever adding up what outages, emergency call-outs and lost productivity actually cost across a year. The second is hiring one in-house generalist and expecting them to cover security, cloud, networking and service desk volume equally well indefinitely, which is a lot to ask of any one person as the business grows around them. The third is treating managed IT and in-house IT as mutually exclusive, when for many businesses in the upper half of this range, a co-managed model gets more of the benefit of both than picking one exclusively ever would.

The same hidden-cost pattern shows up in narrower slices of the estate too, not just the IT function as a whole. Our managed firewall vs DIY cost comparison walks through exactly this dynamic for a single piece of infrastructure: the visible cost of doing it yourself looks lower right up until the patching, monitoring and out-of-hours cover nobody owned turns out to be where the real cost was hiding.

How to decide

Start by counting what break-fix has actually cost you over the last year, not just in invoices but in downtime, delayed projects and the times something waited longer than it should have because nobody was actively watching for it. If that number is uncomfortable, or you can't answer it because nobody's been tracking it, that's usually the clearest sign that reactive support has already become the more expensive option. Then be honest about what an in-house team can realistically cover: deep knowledge of your business is genuinely valuable and hard to replace, but it isn't the same thing as broad specialist coverage across every area IT now touches, security, cloud, compliance and infrastructure among them. For most growing businesses in the 15-250 seat range, the answer that holds up longest is managed IT support, either as the whole solution or alongside an in-house lead who keeps the institutional knowledge in-house while a provider covers the rest.

If you want a straight read on which model fits where you are right now, our managed IT support team can talk through what's actually covered, and what a co-managed setup could look like if you already have some in-house capability worth keeping. We're based in Brough, East Yorkshire, and support businesses in this exact seat range across the region, from our Leeds, Sheffield, Hull and York pages through to the full Yorkshire coverage area. And if the desktop and device side of your IT strategy is the next question, our AVD vs Windows 365 vs traditional desktops comparison covers that decision in the same straight, neutral way.