How to hire a Head of Data in the UK, fractional or full time
Hiring a fractional Data Lead in the UK takes seven steps: write the gap down, set the budget from the published day-rate band, check fractional is the right shape, shortlist people who have held the seat at your stage, interview with the six questions below, agree the day-ninety markers in writing, and contract the days and the IR35 position. Most companies go from brief to signed contract in about two weeks. To skip the reading and meet people, hire a fractional Data Lead from the seat page.
UK day rates for the seat run £700 to £1,200. All eleven seats compared →
Fractional or full time: which Data Lead hire you need
A fractional Data Lead costs £700 to £1,200 a day, usually two days a week, which is £5,367 to £9,200 a month with no employer costs. A full-time Data Lead is a salary plus employer National Insurance and pension, and a retained search adds 25 to 33 per cent of first-year earnings. Fractional fits two or three days of judgement; full time fits five days of leadership.
| Route | Cost basis | Time to start | Commitment | Best for |
|---|---|---|---|---|
| Fractional | £700 to £1,200 a day; £5,367 to £9,200 a month at two days | Met within days, starting in one to three weeks | One to three days a week, usually a month's notice | Owning the Data Lead decisions two or three days a week |
| Interim | £13,417 to £23,000 a month at 5 days | Weeks rather than months | Full time for a fixed term, typically 3 to 9 months | Cover for a departure, a transaction or a turnaround with an end date |
| Full-time search | A salary plus employer costs, and 25 to 33 per cent of year one as the search fee | eight to twelve weeks of search, then three to six months of notice | Permanent and employed, five days a week | A five-day seat that is certain to be permanent |
The difference between the three routes is set out in full on fractional versus interim versus full-time, and hiring a full-time executive covers the permanent route.
Hiring a fractional Data Lead in seven steps
- Write the gap down. Name the two or three things a fractional Data Lead must own in the first quarter, and how many days a week that is. List the decisions you cannot make because you do not trust the numbers. Five of those tell a good operator the shape of the job faster than any list of tools you happen to run. Below ↓
- Set the budget from the published band. UK fractional Data Lead day rates run £700 to £1,200 in 2026. Two days a week is £5,367 to £9,200 a month, with no employer costs on top. Fractional Data Lead cost →
- Check fractional is the right shape. A fractional Data Lead is two or three days a week for a year or more. If the need is five days for six months, or the seat is a full-time job already, interim or permanent fits better. Below ↓
- Shortlist people who have held the seat at your stage. Read track records, not titles. The right operator has been the Data Lead at a company of your size and stage before, and says what happened there in numbers. Browse the bench →
- Interview with the six questions. Every question asks for something that happened. An operator who has held the seat answers from memory; one who has advised from the sidelines answers in the abstract. Below ↓
- Agree the day-ninety markers in writing. Put the day-ninety outcomes in the brief before they start. A written set of metric definitions signed off by finance and sales, with the dashboards that contradicted each other reconciled or switched off. Below ↓
- Contract the days, the notice period and the IR35 position. Fix the days a week, a notice period of a month, who owns the output, and the IR35 determination. Then set the start date and the first ninety-day review. IR35 for fractional executives →
What the seat covers is on the fractional Data Lead page. The rest of this page is the part that usually goes unwritten: the interview, day ninety, and when this hire is the wrong answer entirely.
Where to find a fractional Data Lead in the UK
Four routes work, and most companies use two of them at once. Whichever finds the person, the shortlist test is the same: they have held the seat at a company of your size and stage before.
- A platform or bench with the rate on the profile. The day rate is visible before the first call, which settles the budget conversation early. The UK fractional platforms, compared.
- A search against a written brief. Somebody else runs the longlist and the first interviews and puts a shortlist in front of you. How Operator Search works.
- Your investors, accountant or lawyer. They have seen fractional data leaders work at other companies and know which ones they would have back.
- Other founders. A Data Lead who has done it at a company like yours is usually two introductions away. Ask what they would hire them for again, not whether they were good.
Six questions to ask, and what a strong answer sounds like
Every question here asks for something that happened, not something they believe. An operator who has genuinely held the seat answers from memory; one who has advised from the sidelines answers in the abstract, and the difference is audible within a minute.
1. Walk me through the last reporting stack you inherited rather than built. What did you keep, what did you rip out, and why?
Listen for: A strong answer names specific trade-offs and keeps things that worked, even ugly things, because rebuilds cost months. A weak answer proposes a full rebuild before understanding why the old stack looked the way it did.
2. Pick a metric two of our teams would define differently, say active customers or gross margin. How do you get the company to one definition?
Listen for: Strong candidates describe a process: get finance, sales and product in a room, write the definition down, name who signs it off, then enforce it in the warehouse. Weak ones name a tool, usually a semantic layer, as if the disagreement were technical.
3. What did your last data stack cost to run each month, and what would you build for a company our size?
Listen for: A strong answer has real numbers and scales the stack to the company: a few hundred pounds a month is normal under fifty people. A weak answer does not know the bill, or reaches for enterprise tooling regardless of your size.
4. Tell me about an AI or machine learning project you stopped, or refused to start. What did you say and to whom?
Listen for: You want someone who has told a leadership team the data was not ready and what a useful baseline would have been. Someone who has never said no to an AI project has either never been asked or never pushed back, and both are problems in this seat.
5. The CEO says the CAC figure in the board deck is wrong. What do you actually do that week?
Listen for: Strong answers trace the number to source: which spend is included, which attribution window, where the join breaks, then report back with what changed and why. Weak answers get defensive, or turn a data quality question into a tooling debate.
6. Who used your reporting in your last engagement, and how do you know they used it?
Listen for: The strong answer points at decisions: a price change, a channel cut, a meeting that now runs off one dashboard. The weak answer counts dashboards shipped, which measures output, not whether anyone trusted it enough to act.
Red flags
- Proposes a stack before asking what decisions you cannot currently make. Tooling first is analyst thinking wearing a leadership title.
- Cannot tell you what their last platform cost to run each month. Someone who never owned the bill never really owned the function.
- Every past engagement was a migration or a rebuild, and none of them ends with reporting a leadership team actually ran meetings from.
- Agrees with your AI plans in the first meeting. Half the value of this seat is being told when the data is not ready, and a candidate who never says not yet is selling, not advising.
What day ninety should look like
Agree these before they start, in writing, in the brief. A fractional engagement without a ninety-day marker drifts into a retainer nobody remembers the point of.
- A written set of metric definitions signed off by finance and sales, with the dashboards that contradicted each other reconciled or switched off.
- The board pack produced from the warehouse instead of by hand, in hours rather than days, with someone in-house shown how to rerun it.
- A one-page verdict on your AI ambitions: what the data supports today, what it would cost to close the gap, and in what order, even if the honest answer is not yet.
When a fractional Data Lead is the wrong answer
- You need dashboards built and ad hoc questions answered most days. That is an analyst at £400 to £600 a day, and a good fractional data lead will say so on the first call rather than take the brief.
- The numbers are untrustworthy because the bookkeeping is. No pipeline fixes missing management accounts; that gap belongs to the CFO seat, and data work on top of it just automates the confusion.
- You are pre-revenue with a handful of users. A spreadsheet and honest counting will carry you further right now than a warehouse, and the money is better spent on the product.
If one of those is you, say so in a brief anyway and we will tell you straight. Sometimes the honest answer is interim or full-time.
What to put in a fractional Data Lead brief
- List the decisions you cannot make because you do not trust the numbers. Five of those tell a good operator the shape of the job faster than any list of tools you happen to run.
- Set days and decision rights in writing: one to two days a week is typical, and say whether they can retire reports and pick tooling without a committee. Operators walk away from briefs where every change needs sign-off.
- Name who runs the stack after they step back: an analyst they will train, an engineer, or honestly nobody yet. Founders always leave this out, and building for handover to nobody is a different job that should be scoped and priced as one.
What the contract should cover
General guidance rather than legal advice: have the engagement letter read by somebody who acts for you. These are the clauses that cause the arguments when they are missing.
- The days. How many a week or a month, whether they roll over, and the day rate or monthly figure that pays for them.
- Notice. A month either way is the usual term, long enough to hand over and short enough that neither side is trapped.
- Intellectual property. Who owns the models, documents and code the Data Lead produces. It should be the company, said in writing, because without a clause it may not be.
- IR35. Whether the engagement is inside or outside, who made the determination, and the reasons. IR35 for fractional executives explains who carries the decision.
The rest, from confidentiality to conversion terms, is in what a fractional executive contract should say.
Common questions about hiring a fractional Data Lead
How quickly can a company hire a fractional Data Lead?
Faster than any other way of filling the seat. A request to a fractional Data Lead on the bench is accepted or declined within three days, and a brief to Operator Search returns a shortlist in five business days. A permanent Data Lead search runs eight to twelve weeks to an accepted offer and then a notice period of three to six months, which is why fractional cover is the normal bridge.
How many days a week should a fractional Data Lead be hired for?
Two is the most common arrangement and one to three is the working range. Below a day a week nobody can own a function; above three the seat has usually become a full-time one and the honest conversation is about converting. Start at the lower end and add a day when decisions begin queueing for the Data Lead's days.
What is the monthly cost of a fractional Data Lead two days a week?
At the 2026 UK band of £700 to £1,200 a day, two days a week over 46 working weeks comes to £5,367 to £9,200 a month, invoiced by the operator's own company with no employer National Insurance, pension or recruitment fee on top. Higher end for machine learning and AI strategy work as well as pipeline building.
Can a fractional Data Lead later become the full-time Data Lead?
Yes, and it is one of the better routes to a permanent hire because both sides have had months of working interview. Raise the possibility early so the operator can plan their other clients, agree a start date around their notice to those clients, and check the engagement letter for any conversion terms before the conversation.
What should a brief for a fractional Data Lead say?
The three outcomes the seat owns in the first ninety days, the days a week and whether on site matters, who the Data Lead reports to and who reports to them, the systems and data they will inherit, and the budget as a day rate or a monthly figure. A brief that lists tasks rather than outcomes attracts people who want a to-do list, and the fractional data leaders worth hiring decline it.
When should a company hire a full-time Data Lead?
When the work fills five days and stays there: decisions queue for the Data Lead's days every week, there is a team of leaders to manage, and the role is certain to be permanent. A retained search for the seat runs 25 to 33 per cent of first-year earnings. Until all three are true, a fractional Data Lead at two days a week is the cheaper way to find out.
How long does it take to hire a Data Lead, fractional or full time?
A fractional Data Lead is usually met within days and starts in one to three weeks: Operator Search returns a shortlist in 5 business days, and a request on the bench is answered within three. A permanent Data Lead takes eight to twelve weeks of search to an accepted offer, then a notice period of three to six months, so a first day is usually six months or more away.
How do I find a part-time Data Lead?
Four routes work in the UK: a fractional platform or bench where the day rate is published before you speak to anybody, a search run against a written brief, a referral from an investor, accountant or another founder, and the Data Lead's own network of former colleagues. Whichever route, shortlist people who have held the seat at your stage, and agree the days, the notice period and the IR35 position in writing.
Two ways in
Browse verified fractional data leaders on the bench and book direct, or brief Operator Search and we run the interviews above for you.