A good marketing brief is one of the cheapest ways to get a better result from any marketing spend. It costs nothing but an hour of clear thinking, and it saves weeks of rework, misaligned expectations and money spent on the wrong thing. Yet most of the briefs we receive at CM Beyer are either two lines long (“we need more leads”) or ten pages of background with no actual ask.
This guide sets out what a brief needs to contain, why each part matters, and how to write one that gets you a campaign, a website or a piece of creative that does what you actually need.
Why the brief matters more than you think
Whoever does your marketing — an agency, a freelancer or someone on your own team — can only work from the information you give them. A vague brief forces them to guess at your goals, your audience and your constraints. Some of those guesses will be wrong, and you will only discover which ones after the work is done. A tight brief removes the guessing. It also makes quotes more accurate, because a supplier who understands the scope can price it properly instead of padding the figure to cover uncertainty.
The eight things every brief should answer
1. The commercial objective
Not “more awareness” or “a refreshed brand”, but the business outcome you are actually paying for. More qualified enquiries? A higher average order value? Fewer customers churning? Say it in one sentence, and attach a number if you can. Everything else in the brief hangs off this.
2. The audience
Who are you trying to reach, and what do they already believe about you? “Small business owners” is too broad to be useful. “Owner-managers of UK trade businesses turning over £250k to £1m, who currently rely on word of mouth and are nervous about wasting money online” is something you can build a campaign around.
3. The single most important message
If your audience remembers only one thing, what should it be? Resist the urge to list ten selling points. A brief that tries to say everything says nothing. Pick the one claim that matters most and make the supporting points secondary.
4. What you are asking for
Be specific about the deliverable. “A campaign” could mean a single paid-search ad or a six-month multi-channel programme. State the format, the channels and — if you know them — the quantities: three landing pages, a month of social posts, one explainer video.
5. The mandatories and the no-gos
Every business has non-negotiables: a logo that cannot be altered, a tone of voice, a claim you are legally not allowed to make, a competitor you must not be compared to. List them. It is far cheaper to flag a constraint at the brief stage than to discover it in the second round of amends.
6. The budget
Withholding your budget does not get you a better price — it gets you a proposal scoped to the wrong size. Tell your supplier what you can spend and let them tell you what is realistic within it. If you genuinely do not know, give a range. We cover this in more detail in our guide on what a realistic marketing budget looks like for a UK SME.
7. The timeline
Include the real deadline and the reason behind it. “By the end of the quarter” is a preference; “before our trade show on 14 March” is a fact that changes how the work is planned. Flag any fixed dates, review gates and periods when key people are unavailable.
8. How you will judge success
Agree the measure of success before the work starts, not after. If you cannot say how you will know whether the campaign worked, you will end up judging it on gut feel — and gut feel favours whoever argues hardest. Our guide to measuring marketing without a data team sets out five numbers most SMEs can track without special tools.
A quick test before you send it
Read your brief back and ask: could a competent stranger, with no other context, produce something useful from this alone? If the answer is no, the gaps you feel are exactly the gaps your supplier will feel — except they will fill them with assumptions instead of questions. Close the gaps now.
What a good supplier does with it
A strong marketing partner will not simply accept your brief and start work. They will interrogate it — challenging a soft objective, questioning an audience assumption, or pointing out that your budget and your ambition do not match. That pushback is a feature, not friction. A supplier who takes a weak brief at face value and starts billing is not doing you a favour.
At CM Beyer we treat the brief as the first deliverable of every engagement. If yours is not ready, we help you write it before we quote — because a project scoped on a bad brief helps no one. If you would like a hand turning a rough idea into a workable brief, get in touch or start a project in your portal for an itemised quote, usually within one working day.
