If your business is turning over £1m or more and marketing has become the thing quietly holding back your next phase, you’ve probably narrowed it to three options: hire in-house, appoint an agency, or bring in a fractional CMO. They aren’t interchangeable, and the right answer depends far less on budget than on what’s actually missing.
The stakes are highest with the full-time hire. Once employer National Insurance (15% from April 2025), pension, bonus, recruitment fees and ramp-up are added, the true first-year cost of a full-time UK CMO is widely put at £250,000 to £345,000 [1]. That’s why the fractional model has matured fastest exactly where you sit: UK demand is concentrated in £2m to £50m businesses that need senior marketing leadership but can’t yet justify that fixed overhead [2]. Here’s the honest version of the trade-offs.
Hiring in-house
A full-time hire gives you someone in the room every day, close to the business and fully yours. The catch is what you’re really paying for. Many growing businesses don’t yet need that person five days a week; they need senior thinking consistently and senior doing occasionally. Hire too junior to save cost and you get someone who executes well but can’t set direction. Hire senior and you may be paying board-level rates, and carrying board-level recruitment risk, for a role that isn’t full yet.
Appointing an agency
An agency gives you capacity and specialist skills quickly. Where agencies tend to fall short is ownership. Most deliver against a brief; they don’t sit inside your business, understand your commercial goals, or take accountability for whether marketing actually moves the numbers. You often end up needing someone on your side to direct the agency, which is the very gap you were trying to fill in the first place.
Bringing in a fractional CMO
A fractional CMO gives you senior marketing leadership, strategy, direction and accountability, without a full-time salary on the payroll. In our experience it suits businesses at exactly your stage: too big to muddle through without proper marketing leadership, not yet at the point of justifying a full-time CMO. The thinking is genuinely senior, and the good ones don’t just hand you a plan; they stay close enough to make sure it gets delivered.
The honest limitation: a fractional CMO isn’t onsite every day. If your business needs constant hands-on marketing management with no in-house support at all, you may need a fractional lead plus delivery resource beneath them. That’s a feature to plan for, not a flaw to discover later.
The real cost comparison
It helps to be concrete. Set a two-day-a-week fractional engagement at, say, £7,000 a month, roughly £84,000 a year, against the £250,000 to £345,000 fully loaded cost of the full-time equivalent, and the gap isn’t marginal. It’s growth capital: budget that can fund delivery, a junior hire, or runway instead of a single senior salary. The agency route rarely shows up this cleanly, because you’re usually buying execution and then paying, in time or money, for someone to direct it.
There’s a risk dimension too. A permanent senior hire takes months to recruit and is slow and costly to exit if the fit is wrong, and a meaningful share of senior marketing hires don’t work out within their first eighteen months. A fractional arrangement typically flexes on a short notice period, which effectively removes the cost of that mistake. For a business still working out what senior marketing leadership should even look like, that optionality is part of what you’re buying.
So which one?
Broadly: if you need daily presence and can justify the cost, hire in-house. If your strategy is set and you need specialist execution, use an agency. If what’s missing is senior strategic leadership and accountability, the thinking that decides what to do and owns whether it works, that’s where Fractional CMO earns its place. And if the deciding factor is cost, read the honest UK breakdown in How Much Does a Fractional CMO Cost in the UK? before you commit to anything.
The wrong question is “which is cheapest?” The right one is “what’s actually missing?” Answer that honestly and the choice usually makes itself.
References
- Full-time UK CMO loaded cost, per Robert Half UK 2026 Salary Guide and UK cost analyses (UK). https://www.themarketingcentre.com/blog/calculate-cmo-cost
- UK fractional CMO market maturity and demand by revenue band (UK). https://fractional-csuite.com/cmo/uk/
