What is a fractional head of data?

A fractional head of data is a senior data leader who holds the data seat at a company for one to three days a week, on an ongoing basis, owning the data model, the metrics everybody argues about, the analytics stack and the governance that keeps the numbers trusted, and directing the analysts or agency that build it. In the UK the day rate is £700 to £1,200 in 2026, and two days a week is the most common shape.

Also called

Fractional head of data, Fractional chief data officer (CDO), Fractional head of analytics and Part-time data director. The job is the same under each name; the words differ by market and by who is selling it. What a fractional executive is covers the pattern across every seat.

What the title means in practice

One definition of every numberRevenue, active customer and churn mean three things in three dashboards until somebody decides. The head of data writes the definitions, builds the model once and retires the spreadsheets that disagree with it.

A stack sized to the companyWarehouse, pipelines and a reporting tool chosen for the volume and the team the business actually has, rather than the architecture a vendor demo suggested. Most small companies are overspending on tools and underspending on modelling.

Governance that survives an auditWho can see personal data, how long it is kept and where it flows. UK GDPR obligations sit here as much as with legal, and a buyer's due diligence will ask about both.

The ground under any AI ambitionMachine learning and AI projects fail on data quality long before they fail on models. The head of data decides what is ready to build on and what has to be cleaned first.

What a fractional head of data is not

Not an analytics agency. Builds dashboards and pipelines to a brief; nobody inside decides which numbers matter or keeps them true. Fractional head of data or an analytics agency.
Not a CTO. Owns the platform and the engineering team; the head of data owns what the data means and who can use it. What a fractional CTO does.
Not a CISO. Owns security controls across the company; the head of data owns the data inventory those controls protect. What a fractional CISO does.

Head of data, chief data officer and chief AI officer

Head of data is the working title in a company of up to a few hundred people: the person who owns the model, the metrics and the analysts. Chief data officer is the board-level version, usually found in larger or regulated businesses where data governance is a standing risk. In a fractional brief the two are the same seat and priced in the same band.

Chief AI officer is a newer title for somebody who owns where AI is used across the company. It overlaps with this seat and has its own page.

Fractional chief AI officer.

Fractional head of data job description

The scope a brief for this seat usually lists. Each item is a thing the person owns, not a task they perform; at one to three days a week the owning is the job.

Metric definitions agreed with the leadership team and published
The data model and warehouse, built once and documented
Reporting the board and each team actually use, with the rest retired
Data governance: access, retention and UK GDPR records of processing
Data quality checks and an owner for each source system
Readiness assessment for machine learning and AI projects

Reports to the chief executive or the CFO, works with the CTO on the platform, and leads the analysts and data engineers.

What it costs

A fractional head of data charges £700 to £1,200 a day in the UK in 2026. Higher end for machine learning and AI strategy work as well as pipeline building. At two days a week that is £5,367 to £9,200 a month, before VAT and with no employer costs on top, because the executive is not an employee. The full arithmetic, at every day count and against a full-time hire, is on the fractional head of data cost page.

Where the word comes from

Data leadership went fractional as companies past their first funding round found the board pack disagreed with the finance system, and the analyst they had hired spent the week reconciling. The arrival of AI tools sharpened it, because every AI plan starts with the question of whether the data can be trusted.

Common questions

What does fractional head of data mean?

A head of data who holds the data seat for a fraction of the week, usually one to three days, on an ongoing basis. They own the metric definitions, the data model, the reporting and the governance, and direct whoever builds the pipelines.

Is a fractional head of data the same as a fractional CDO?

In most briefs, yes. Chief data officer is the board-level title used by larger and regulated companies; head of data is the working title elsewhere. The day rate is the same band, and the brief decides the scope rather than the word.

When does a company need a fractional head of data?

When two dashboards give two answers to the same question, when an analyst spends the week reconciling, before an AI project that depends on clean data, or when due diligence is coming and nobody can say where personal data lives.

How much does a fractional head of data cost?

£700 to £1,200 a day in the UK in 2026, most often at one to two days a week. Higher end for machine learning and AI strategy work as well as pipeline building. The monthly and annual arithmetic is on the cost page for the seat.

What does interim head of data mean?

An interim head of data holds the seat full time, 5 days a week, for a fixed 3 to 9 months, covering a departure, a transaction or a crisis. A fractional head of data holds it 2 days a week with no end date. At the same day rate, interim runs £13,417 to £23,000 a month against £5,367 to £9,200. Fractional or interim, side by side.

From the word to the person

Verified fractional data leaders, rate on the profile

What the seat covers and who is on the bench, how to interview for it, or brief Operator Search and the shortlist comes to you.