Guide · Technology leadership
What is a fractional CTO, and do you need one?
What the role actually is, what it costs in the UK, and the bit that often gets left out of the sales pitch.
"Fractional CTO" has gone from a phrase nobody used to something every second LinkedIn profile claims to be. That's partly fashion. It's also because a lot of businesses have the same problem: they need someone senior making technology decisions, and they can't justify a full-time chief technology officer on a six-figure salary.
Here's what the role actually is, what it costs, and when one on their own is enough.
The meaningWhat does fractional CTO mean?
A CTO (chief technology officer) is the person who owns technology for a business. They decide what to build and what to buy, pick the suppliers, set the budget, make sure it's secure, and explain all of it to the board in words the board understands.
A fractional CTO does the same job for a fraction of the week. Typically two to four days a month, sometimes a day a week. You get the experience of someone who's done the job at bigger companies, without paying for the days you don't need.
Fractional, virtual, part-time or outsourced CTO: what's the difference?
Mostly, nothing. They're four names for roughly the same arrangement, and people use them interchangeably. If there's a difference, it's usually this:
- Fractional CTO. The current fashionable term. One named person, a set number of days a month, usually on a retainer.
- Part-time CTO. The same thing, but often more like an employee on reduced hours. Common in start-ups, sometimes paid partly in shares.
- Virtual CTO. An older term, often used by IT companies selling a CTO-style service on top of their support contract. Can be a person, can be a team.
- Outsourced CTO. Usually a company rather than a named individual, providing the CTO function as a service.
Don't worry too much about the label. Ask who the actual person is, how many days you get, and what they'll do in them.
What does a fractional CTO do?
A good one spends most of their time on decisions and direction. In a typical month that might look like:
- A planning session with the owners or board: what's working, what's at risk, what's next.
- Reviewing what the developers or suppliers have delivered, and whether it's what was agreed.
- Choosing between products or suppliers, and negotiating with them.
- Keeping a tech plan and budget for the next 12 months up to date.
- Checking security, backups and access are under control, or making sure someone else is.
- Interviewing developers or IT staff, and managing the ones you've got.
- Being the person who answers "can we do this, and what will it cost?" when it comes up.
What they don't do: the work
This is the part that catches people out. A fractional CTO is a leader, not a pair of hands. They'll tell you the CRM needs replacing, write the brief and choose who builds it. They won't usually build it. They'll tell you the backups aren't being tested. Someone else has to test them.
That's fine if you already have people to do the work. If you don't, you end up paying a senior day rate for someone to tell you what needs doing, then hiring a software house to build it, an IT company to run it and maybe a security firm to check it. Four suppliers, four invoices, and a lot of the CTO's days spent managing the gaps between them.
How much does a fractional CTO cost in the UK?
As a guide, expect around £800 to £1,600 a day. Regional rates sit at the lower end and London at the top, and monthly retainers typically come in at £3,000 to £7,000 (Fractional Quest, citing Red Eagle Tech, 2026). On two to four days a month, that's roughly £1,600 to £6,400 a month, or £19,000 to £77,000 a year.
Compare that with a full-time CTO, which at a growing UK business is easily a six-figure salary before employer costs. For a business that needs senior thinking a few days a month, fractional is far better value.
But remember that figure only buys the decisions. The building, running and securing come on top. We go through the whole bill in what an IT department costs a small business.
When a fractional CTO on their own is the right answer
- You already have a development team and need someone senior to lead it, set standards and make the big calls.
- You're a funded start-up building a product, and investors want an experienced technical lead before you can afford a full-time one.
- You're about to make one big decision, such as choosing a new ERP, and want an expert in your corner for a few months.
- You have an IT manager who's great day to day but out of their depth on strategy.
When you need a CTO with a team behind them
Most businesses of 10 to 100 people don't have a development team, a sysadmin or a security lead. They have an office manager who's ended up looking after IT, a support company that fixes laptops, and a pile of subscriptions. For them, a fractional CTO alone is advice with nobody to act on it.
What they need is the CTO thinking plus the people who do the work: developers, someone who runs servers and cloud accounts, someone who keeps security and backups in order. Ideally in one team, so the person who planned it is accountable for it actually happening.
That's what we sell, so take this with the appropriate pinch of salt. Our fractional CTO comes with Rob, Jason and a small team of developers and a sysadmin behind them, as part of Your tech department.
How to choose a fractional CTO
- Have they done it hands-on? The best ones have built and run systems themselves, not just managed people who did.
- Can they explain it in plain English? If you don't understand them in the first meeting, the board won't either.
- Are they independent? Ask whether they take commission from suppliers they recommend. Some do.
- Who does the work? If the answer is "we'll find someone", budget for that someone too.
- What happens when they leave? Everything they set up should be documented and in accounts you own.
- How many clients do they have? Two days a month from someone with fifteen clients may be less than it sounds.
For a side-by-side look at a fractional CTO against an IT support company and an in-house hire, see which one does a small business need.
What we'd do
If you've already got developers, hire a good fractional CTO and let them lead. If you haven't, don't buy decisions you've nobody to carry out. Get the thinking and the doing from the same place, and make one team answerable for both.
Common questions
A senior technology leader who works for your business a few days a month instead of full time. They set technology direction, choose suppliers, manage projects and represent technology at board level, usually on a monthly retainer.
Typically £800 to £1,600 a day, with London at the top of that range, usually on a retainer of two to four days a month. That is roughly £1,600 to £6,400 a month, or £19,000 to £77,000 a year.
Broadly, yes. Fractional, virtual, part-time and outsourced CTO all describe senior technology leadership bought for part of the week. Virtual and outsourced CTO services are more often provided by a company than a single named person.
Usually not. A fractional CTO makes decisions and manages the people doing the work. A business without its own developers or IT staff also needs a team to build, run and secure its systems, or a provider that supplies both.
Not sure what kind of help you need?
Tell us what's going wrong and we'll tell you which gap you've got.
Even if the answer is a fractional CTO from somewhere else, or nobody at all.
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