Fractional CMO is the most-asked-about engagement model in the post-PMF startup market. It’s also the most-misunderstood.

Here’s the simple version, then the longer version.

The one-line decision rule

Hire a fractional CMO when the founder is the bottleneck on growth decisions — not when you need more execution capacity.

If your team needs more hands shipping campaigns, hire an agency or a junior. If your team needs senior judgement before another channel, hire, or quarter passes — that’s the fractional CMO call.

Five signals it’s time

  1. The founder is still writing every campaign brief. Not because they enjoy it. Because there’s no one else who can read the numbers and decide what’s worth shipping.

  2. Pipeline arrives in waves. Three good months, two flat ones. No one can confidently explain why.

  3. You’ve added channels in isolation. Paid is running, content is running, outbound is running. None of them are reinforcing each other and there’s no single dashboard that says which is producing real revenue.

  4. You’re spending six figures a year on growth and don’t trust the attribution. Either the budget is wrong or the reporting is.

  5. You’re considering a full-time CMO hire. A 6-month hiring cycle plus a 12-month ramp at £150k base + equity. A fractional CMO bridges the gap, builds the operating system, and gives the eventual full-time hire something to walk into.

Three signals it’s not time yet

  1. You’re pre-PMF. Growth marketing won’t fix product-market-fit. Spend the time on customer research and product. A fractional CMO will tell you this on the first call rather than take the engagement.

  2. You don’t have an internal execution owner. A fractional CMO designs the system; someone inside the company has to ship against it. If there’s no operator on the inside, the system doesn’t survive.

  3. The team is mostly junior and you want senior execution. A fractional CMO is senior judgement, not senior execution. They run weekly meetings, set priorities, manage agencies, and make scale/stop/fix calls — they don’t write your ad copy.

What a fractional CMO actually does

In a 1-day-a-week engagement (about £8,000/month at our rates), a fractional CMO typically:

  • Sets quarterly growth priorities and decision rules
  • Runs the weekly growth meeting and captures decisions
  • Reviews channel performance and makes scale/stop/fix calls
  • Manages agencies, freelancers, or junior marketers
  • Reports to the board on commercial outcome, not activity
  • Designs the operating cadence so the team can keep running it

In ~2 days a week (Fractional CMO Plus, £12,000/month), they also do deeper operating support: hiring profiles, agency briefs, more direct landing-page and offer iteration.

What a fractional CMO doesn’t do

  • Write your blog posts or ad copy
  • Run your CRM as an admin
  • Build dashboards in Looker themselves
  • Replace a full senior team

If you need those things, hire those things. The fractional CMO sits above them.

When to start

Most founders book the call 6-12 months too late. By the time the pain is unbearable, the team is already burnt out and the cost of recovery is high.

If you recognise three of the “it’s time” signals above, book a 30-minute growth diagnostic. We’ll diagnose the bottleneck and decide together if a fractional engagement makes sense — or if a Sprint, Acquisition System Build, or pure Diagnosis is a better fit.