Fractional vs full-time Head of eCommerce vs an agency
When a brand’s digital business outgrows the founder, there are three usual answers. Hire a full-time Head of eCommerce, bring in a fractional one, or hand more of the work to an agency.
All three can work. They solve different problems, and the most expensive mistake is choosing one to fix a problem only another can solve. This guide compares them side by side and explains when each is the right call.
What is the core difference?
The difference is ownership. Who sets the plan, who controls the spend, and who answers for the result?
A full-time Head of eCommerce owns the digital business permanently, with all of their working hours. A fractional Head of eCommerce owns it too, with real decision rights, but part time and for a fixed term. An agency executes the scope you write, usually in one or two channels, and reports on its own work.
Agencies are not worse leaders. They are not leaders of your business at all, and they are not paid to be.
How do the three options compare?
| Full-time Head of eCommerce | Fractional Head of eCommerce | Agency | |
|---|---|---|---|
| Decision rights | Full, permanent | Full inside agreed guardrails, for a set term | Limited to the scope you approve |
| Cost structure | Salary, benefits, payroll taxes, often bonus or equity | Monthly retainer or project fee | Retainer, percentage of spend, or project fee |
| Speed to start | Slowest: search, notice period, ramp-up | Fast: usually weeks | Fast for a defined scope |
| Accountability | The whole digital P&L | The P&L line in scope | Channel metrics it controls |
| Hours | Full time | Part time, fixed weekly commitment | Varies with scope and team |
| What you keep | A permanent leader | A documented, running business and often help hiring the next leader | The work product, if the contract says so |
| Best for | A full role and a proven playbook | Senior ownership now, before a permanent hire makes sense | Execution capacity and specialist skills |
The cost rows deserve care. We explain fractional pricing, and how to compare it with a salary, in how much a fractional Head of eCommerce costs.
When is a full-time Head of eCommerce the right choice?
Hire full time when the job genuinely fills forty hours of senior work. That usually means several channels, a team to manage and a budget large enough that daily decisions matter.
It also helps when the playbook already works. A full-time leader who inherits a clear plan, honest reporting and sound unit economics can scale it. A full-time leader who inherits a mess often spends the first year diagnosing it.
The risk is the hire itself. A senior search takes time, and a wrong hire costs months more. If the business cannot yet describe what success looks like in the role, it is probably too early.
When does a fractional Head of eCommerce make more sense?
Go fractional when the role is real but not yet full time. It also fits when the business needs a fix before a permanent owner. Common patterns:
- The founder is still running eCommerce and it is crowding out the rest of the job.
- Several agencies report to nobody senior, and each one’s numbers look fine while the business does not.
- A previous full-time hire did not work out, and the company wants the business stabilized before trying again.
- New owners inherited a digital channel after an acquisition and need it diagnosed and run quickly.
- A wholesale brand is going direct and nobody internal has done it before.
The test is decision rights. If every call still needs the founder’s sign-off, you are buying advice, not ownership. We explain the role in more depth in what a fractional Head of eCommerce does.
When is an agency enough?
An agency is enough when the strategy is clear and someone senior already owns the result. Then you need hands and specialist skills: media buying, creative, email builds, Amazon listings or development.
Agencies are often the right way to get that work done. Few brands at this stage should build all of it in-house.
The problem starts when the agency becomes the strategy by default. Each agency optimizes the metric it reports, such as ROAS or ACoS. Nobody checks whether the sum of those metrics adds up to a profitable business. That is a gap in ownership, and adding another agency does not close it.
Can you combine them?
Yes, and most healthy setups do. The common pattern is one owner and several executors.
- Fractional leader plus agencies. The fractional leader sets the plan and budget. Each agency is held to numbers that add up to contribution margin.
- Full-time leader plus agencies. The same structure, once the role is full and the business can carry the cost.
- Fractional first, then full time. The fractional leader stabilizes the business, writes the playbook and helps hire the permanent leader.
What rarely works is several agencies with no owner, or a junior marketer asked to direct senior agencies. In both cases the reporting looks busy and the margin goes sideways. Our guide to the Unit Economics explains how to measure what each channel actually contributes.
How do you decide?
Ask three questions in order.
- Does someone senior already own the number? If yes, you may only need more execution, so an agency can be enough.
- Is the role full time today, with a working playbook? If yes, hire full time.
- If not, do you need senior ownership now? If yes, a fractional leader is usually the fastest route.
If you are not sure which answer is true, start with a diagnosis of where the money is going. That is how our engagements begin, and it often makes the right structure obvious.
Frequently asked questions
Is a fractional Head of eCommerce the same as a consultant?
No. A consultant recommends. A fractional Head of eCommerce owns the plan, controls the spend inside agreed guardrails and answers for the result.
Do we have to fire our agency if we hire a Head of eCommerce?
No. A good Head of eCommerce, fractional or full time, manages the agencies you have. They brief them, hold them to numbers and tell you when one is not worth its cost.
Which option is fastest to start?
Usually a fractional leader or an agency, often within weeks. A full-time search, notice period and ramp-up typically take months.
Can a fractional leader become full time?
Sometimes, but it is not the usual goal. More often the fractional leader hands the business to a permanent hire they helped recruit.
Is an agency cheaper than a Head of eCommerce?
It can be for a narrow scope. But an agency does not own the whole P&L. The cheaper option can cost more if nobody checks whether the channels add up to profit.