A fractional CTO works one to three days a week. They write strategy, sit in on board calls, and steer the technical direction without becoming the bottleneck. A product studio takes a fixed scope, ships software, and walks away once the project is done. They sound like alternatives. In practice they solve different problems — and most UK founders we talk to are weighing the two without a clear sense of which one their stage actually calls for. This guide lays out what each model does, what each costs in 2026, and how to tell which side of the line you’re on.
What is a fractional CTO?
A fractional CTO is a senior technology leader who works part time across one or several companies, usually one to three days a week, instead of being a full-time executive on your payroll. You get the strategic technology leadership of a chief technology officer without the commitment of a full-time hire or the full-time salary that comes with it.
The word that matters there is leadership. A fractional CTO is not a part-time engineer you’ve hired cheaply. They set technology strategy, own the technology roadmap, and make the calls a permanent CTO would make — which framework, which architecture, which hire, which trade-off. They do this for a few days a week and a fraction of the cost, which is where the name comes from.
The model has grown quickly in the UK because it fills a real leadership gap. Plenty of early-stage companies need someone senior steering engineering long before they can justify a full-time CTO role and the £150,000 to £200,000 a year salary that role commands. A fractional arrangement closes that gap for a few thousand pounds a month.
What does a fractional CTO actually do?
Day to day, a fractional CTO writes the technology roadmap, runs engineering standups, reviews architecture decisions, and gives your existing engineers someone senior to push back on. They sit in on board calls and translate “we’re behind on the build” into something investors can act on. When you start hiring, they interview engineers and protect you from expensive bad hires.
What they do depends heavily on what you already have. With a founding engineer who’s brilliant but has never shipped at scale, a fractional CTO becomes the person who turns raw talent into a shipping team. With two or three contractors who’ve drifted without direction, they become the person who pulls the work back onto a roadmap. The common thread is that fractional CTOs make the people who write code more productive — they rarely write much of it themselves.
That last point trips up a lot of founders. You are buying days per week of senior judgement and team leadership, not a pair of hands at the keyboard. If what you actually need is the keyboard, the fractional model is the wrong tool, and that’s exactly where the comparison with a product studio starts to matter.
What a fractional CTO doesn’t do
A fractional CTO doesn’t build your product. They’ll architect it, scope it, and hire the people who build it — but on two days a week they are not going to design, engineer, and ship a working app themselves. Nor should they. The whole point of the role is reach: senior direction spread across the weeks, not execution.
This is the gap founders discover the hard way. You hire a fractional CTO expecting a product, and four months in you have an excellent roadmap, a sensible architecture, a hiring plan — and nothing a user can open. The strategy was never the missing piece. The build was. The leadership gap and the building gap feel similar when you’re staring at a blank App Store listing, but they need completely different things to fill them.
A product studio fills the building gap. That’s the comparison that actually matters, so let’s put real numbers on both.
What does a fractional CTO charge in the UK in 2026?
Start with the full-time benchmark: a permanent CTO in the UK commands roughly £150,000 to £200,000 a year, before equity and employer on-costs, according to the Robert Walters Salary Survey 2026 (London tends to sit at the top of that band, the regions lower). A fractional CTO is paid by the day, and the day rate is deliberately higher than the salaried equivalent pro-rata. Contractors price in their own pension, downtime, and risk, so you pay a premium for the flexibility. Expect roughly £1,000 to £1,500 a day for a senior fractional CTO in 2026, and more at the top end, with ITJobsWatch contractor data putting the London median around £1,350 a day. A typical engagement of two days a week for six months works out somewhere around £50,000 to £75,000. You’re paying for advice, technical leadership, and someone to run engineering while you find your feet.
A product studio engagement is priced as a project, not a day rate. At Bluka, an MVP build runs £25–£60k, fixed scope, eight to fourteen weeks. We don’t sit on a retainer. When the agreed scope is done we hand over the code and stop charging. The two figures look comparable on a spreadsheet. The outputs are not remotely the same thing.
| Dimension | Fractional CTO | Product studio |
|---|---|---|
| Pricing model | Day rate (£1,000–£1,500 per day) | Fixed-scope project |
| Typical UK cost (2026) | £50–£75k over 6 months | £25–£60k for an MVP |
| What you get | Strategy, roadmap, team leadership | Working software + source code |
| Headcount | One senior person, part time | Full team (design, engineering, PM) |
| Best when you have | Engineers who need direction | An idea and no build |
| Ends with | A plan and a hiring strategy | A shipped product |
The honest way to read that table: a fractional CTO is the cheaper way to lead an engineering team you already have. A studio is the cheaper way to get a product built when you don’t have a team at all. Spending fractional-CTO money to not get a product is the most common budget mistake we see at this stage.
When to hire a fractional CTO
A fractional CTO is the right choice when the missing piece is leadership, not hands. You’re a good fit if:
- You already have engineers — even one or two — and they need direction, a roadmap, and someone senior to answer to.
- You have a product that exists and a CTO-shaped hole in your org chart. Investors are asking who runs engineering, and you need that answer on the cap table before you can afford a full-time CTO.
- You’re making architecture or technology-strategy decisions that will be expensive to reverse, and nobody in the building has made them before.
- You’re about to hire engineers and need someone who can interview them properly so you don’t spend £80k on the wrong person.
In every one of those cases there is a team or a product to lead. The fractional CTO’s part-time CTO role gives you senior judgement against your business goals without the cost of a full-time executive. That’s the model working as intended.
When to hire a product studio instead
A product studio is the right choice when you have an idea, a deck, and maybe a Figma file — and nothing has been built yet. You don’t need leadership. You need the thing to exist. You don’t have engineers to lead because you don’t have engineers.
A studio gives you the entire team — designer, engineer, product manager, AI specialist — for roughly the cost of one part-time fractional CTO. They build the product, ship it, and hand it over. You walk away with working software, the source code, and a deployment your future in-house team can pick up when you raise. If you’ve never written a brief for a build like this, our guide on how to write a brief for your UK app developer is the place to start before you talk to anyone.
This is the model Bluka runs, so treat the next sentence as the founder-honest disclaimer it is: if your real problem is leading an engineering team you already employ, a studio is the wrong call and we’ll tell you so. But if your problem is that the product doesn’t exist yet, no amount of fractional strategy will conjure it. Someone has to build it.
The hybrid model that nobody pitches
The cleanest setup, if you’re well funded, is to use both. Hire a fractional CTO to own the technology strategy, then bring in a product studio to execute against it. The fractional CTO defines what gets built and how success is measured. The studio builds it. The CTO becomes your technical co-founder in everything but title; the studio becomes the engineering team you don’t yet need to recruit.
This is the version we see work most consistently with funded founders. The roadmap stays coherent because one senior person owns it, and the product actually ships because a full team is executing full time. Roughly budgeted, both together run £80–£120k over six months. You exit with a product, a technology roadmap, and a hiring plan for the in-house team you’ll bring on when funding lands — which is a far stronger position than having spent the same money on only half the equation.
Nobody pitches this because each side has an incentive to be your only line item. We mention it because watching a founder burn six months on the wrong single choice is worse for everyone than an honest “you might need both.”
A worked example: the same £60k, two outcomes
Picture two founders, each with £60k to spend and the same goal — a launched app within six months.
The first hires a fractional CTO at £1,150 a day, two days a week. Over six months that’s roughly £60k. They get a sharp technology roadmap, a clean architecture, two contractor engineers interviewed and hired, and a sensible delivery plan. At month six they have a half-built product, because two contractors managed part time can only move so fast, and the budget is gone. The leadership was excellent. The build was underfunded.
The second founder spends the same £60k on a fixed-scope studio engagement. At month four they have a shipped MVP in both app stores, the source code, and a deployment they own. What they don’t have is a technology roadmap beyond launch or anyone senior to lead the next phase — so their month-five problem is “who runs engineering now,” which is a much better problem to have than “where’s the product.”
Neither founder was wrong about the model; they were wrong about the order. The first needed a build before leadership made sense. The second will need leadership now that the build exists. This is exactly why the hybrid sequence — strategy first, then execution, or execution first, then strategy — beats picking one and hoping it covers both jobs.
Frequently asked questions
What does “fractional CTO” mean? It means a chief technology officer working part time — a fraction of a full-time role — usually split across one or several companies. You get senior technical leadership for a few days a week rather than a full-time executive on a full-time salary.
Is a fractional CTO cheaper than a full-time CTO? Yes, substantially, if you genuinely only need part-time leadership. A full-time UK CTO commands roughly £150,000 to £200,000 a year before equity and on-costs. A fractional CTO at two days a week costs far less in total, even though the day rate itself is higher than a salaried CTO’s equivalent daily pay. The saving only holds if part-time direction is what you actually need — if you need full-time execution, the maths changes.
Fractional CTO vs technical co-founder — what’s the difference? A technical co-founder takes equity, commits long term, and usually builds as well as leads. A fractional CTO is a paid part-time hire with no equity and a defined end date. Co-founders are scarce and permanent; fractional CTOs are flexible and replaceable by design.
Do IR35 rules apply to a fractional CTO in the UK? Often, yes. Fractional CTOs frequently engage as contractors, so the UK’s off-payroll working rules can apply depending on how the engagement is structured. Check the current position with GOV.UK’s off-payroll working (IR35) guidance and your accountant before you sign anything.
What to do next
Hire a fractional CTO if you have an engineering team that needs leadership. Hire a product studio if you have an idea that needs to become a product. If you have neither and the budget for both, do both. The expensive version of this story is the founder who picks the wrong one and spends six months working out which they actually needed.
If you’re not sure which side you’re on, tell us about your project. We’ll give you an honest take — even if it’s “hire a fractional CTO instead, and here are three we trust.”
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