Writing an Advertising Campaign Brief: What Actually Belongs In It
Bad briefs are expensive in a way nobody invoices for. The IPA and BetterBriefs surveyed 508 UK marketers and agency staff and found marketers themselves estimate that 26 percent of marketing budget goes to poor briefs and misdirected work. Only 6 percent of agencies said they were clear on the strategic direction in the briefs they received.
That gap does not close with a longer document. It closes with a shorter one that answers the right questions.
Key takeaways
- An advertising campaign brief starts with a problem, not a deliverable. “We need three videos” is an order, not a brief.
- One message per campaign. If the brief lists four things the audience should think, the work will communicate none of them.
- Mandatories and prohibited claims belong in the brief, not in a legal review two days before launch.
- Nigerian campaigns need ARCON pre-exposure clearance. Name the person responsible for it inside the brief.
- Only 30 percent of brands have evaluation criteria in place before work begins, which is why so many campaigns get argued about instead of measured.
- Keep the advertising campaign brief to two pages. A third page usually means the strategy is still unresolved.
A campaign brief is not an agency onboarding brief
An advertising campaign brief and an agency onboarding brief are different documents, and mixing them produces a bad version of both.
An onboarding or creative brief introduces a brand to an agency: history, values, tone, competitors, existing assets. You write it once, then update it yearly.
An advertising campaign brief covers one campaign with a start date, an end date, a budget, and a measurable objective. You write a new one each time.
| Onboarding brief | Campaign brief | |
|---|---|---|
| Written | Once per relationship | Once per campaign |
| Covers | Brand, tone, history, assets | One objective, one window, one budget |
| Owner | Brand or marketing lead | Campaign lead |
| Length | As long as it needs to be | Two pages |
| Expires | When the brand changes | On the campaign end date |
If your agency already knows the brand, the campaign brief does not need to re-explain it. Attach the onboarding document as a link and move on.
The nine sections of a working advertising campaign brief
Nine sections cover a complete advertising campaign brief, and none of them needs more than a paragraph.
| Section | What it answers |
|---|---|
| Problem | What is going wrong, or what opportunity is unclaimed |
| Objective | What changes, by how much, by when |
| Audience | Who specifically, and what they currently believe |
| Single message | The one sentence they should leave with |
| Support | The proof that makes the message believable |
| Mandatories | Claims required, claims banned, legal and regulatory |
| Deliverables | Assets, formats, aspect ratios, quantities |
| Channels and budget | Where it runs, what it costs, how it splits |
| Measurement | The metric, the baseline, the reporting cadence |
Everything below unpacks the sections that get written badly most often.
Start with the problem, not the deliverable
Write the problem as a sentence that could be wrong.
“Awareness is low” is not a problem statement. It is a category. A usable one names a specific gap: sign-ups drop 60 percent between the app store page and account funding, or the product is bought by people over 40 and nobody under 30 has heard of it.
The test: could a smart person disagree with your problem statement? If not, it is a description rather than a diagnosis.
This is the section that most improves an advertising campaign brief and the one most often replaced with a request for three videos and a billboard.
The audience section people get wrong
Demographics describe who they are. An advertising campaign brief needs what they currently believe.
Age, income, and location are useful for media buying and nearly useless for creative. What creative teams need is the belief you are trying to shift.
Write it as a before and after:
- Currently thinks: Sending money home means paying a fee I cannot predict.
- Should think: The fee is shown before I confirm, every time.
Two lines like that direct a campaign further than a page of persona detail. Add one real quote from a customer if you have one, and skip the invented persona name entirely.
One message, written as a sentence
If the brief has four messages, the campaign has none.
Pick one. Write it as a full sentence in plain language, not as a fragment or a theme. “Reliability” is a theme. “Your transfer arrives the same day or the fee is refunded” is a message.
Support goes underneath: the two or three facts that make the message credible. A guarantee, a number, a certification, a demonstration.
Mandatories, claims, and compliance
The mandatories section of an advertising campaign brief is where campaigns get pulled after launch.
Split it into three lists: required elements, prohibited claims, and regulatory approvals.
Required elements are the easy part. Logo placement, disclaimer wording, legal footers, sign-off lines.
Prohibited claims need more thought. Write down what the campaign cannot say, including anything unsubstantiated, comparative, or superlative. Anything with the word “best” or “safest” in it needs evidence attached in the brief.
Regulatory approvals depend on where the campaign runs. In Nigeria, the Advertising Regulatory Council of Nigeria requires pre-exposure vetting of advertising and marketing communications under the ARCON Act of 2022, and that now covers digital and influencer content. Build the vetting window into your timeline rather than discovering it in launch week.
Campaigns using creators or testimonials for US audiences also fall under 16 CFR Part 255, which requires material connections between an endorser and a brand to be disclosed clearly and conspicuously. State in the brief who writes the disclosure language and who checks that it ran.
Deliverables and production requirements
List assets by format and aspect ratio, not by vague category. This is the section a production team reads first, and a vague advertising campaign brief costs a day of back-and-forth before anyone can quote it.
“Social assets” means nothing. A production team needs counts and specs.
| Asset | Quantity | Spec |
|---|---|---|
| Hero film | 1 | 16:9, 60 to 90 seconds |
| Cutdowns | 3 | 16:9, 30s / 15s / 6s |
| Vertical | 6 | 9:16, under 20 seconds |
| Stills | 12 | Square and 4:5 |
| Landing page assets | 1 set | Hero image, three supporting stills |
Production notes belong here too, because they change the budget and the schedule. A campaign shot on a plain backdrop with two setups is a different day from one that needs aerial coverage.
If the concept calls for depth-of-field separation across several looks, the lens package decides how many setups fit in a day. Controlled color on interviews usually means RGB tube lighting rather than whatever the venue provides. A studio sequence against a paper backdrop shoots faster than a location, and a compact body like the Sony ZV-E1 covers vertical grabs on the same day as the hero film. Aerial or FPV coverage using something like the DJI Avata is worth stating explicitly, since it adds permits and a separate operator.
None of this needs to be decided by the brief writer. It needs to be flagged so the production quote reflects reality.
Channels and the ad campaign landing page
Every paid click needs somewhere to land, and the brief should say where.
Media plans get written after the brief, but the brief still names the channels under consideration and the split between them. That tells the creative team which formats matter most.
The ad campaign landing page deserves its own line. Sending paid traffic to a homepage is the most common waste in digital campaigns, because the homepage answers a different question than the ad asked.
Google treats this as a scoring factor. Its documentation on Quality Score lists landing page experience as one of three components, alongside expected click-through rate and ad relevance. A mismatched page raises what you pay per click.
Your brief should specify:
- The URL, or that a new page needs building
- The single action the page asks for
- Which message from the brief the page headline must echo
- Who owns the build, and by what date
Measurement and the advertising campaign report
Agree the metric and the baseline before the work starts, not after it runs. Measurement is the last section of the advertising campaign brief and the first one people skip.
The IPA research found only 30 percent of brands had evaluation criteria in place. That is the reason so many campaigns end in a debate about whether they worked.
A measurement section needs four things: the primary metric, the current baseline, the target, and the reporting cadence. One primary metric. Secondary metrics can be listed, but they do not decide success.
Say what the advertising campaign report will contain and when it arrives. A weekly advertising campaign report during flight and a full read two weeks after close is a normal cadence. Specify whether the report covers media performance only or includes creative-level breakdowns, because those take longer to assemble.
An advertising campaign brief example, condensed
Here is what the whole thing looks like at working length.
The following advertising campaign brief example is hypothetical, for a fictional remittance app:
- Problem: First-time users abandon at the fee confirmation screen. Drop-off is 44 percent at that step.
- Objective: Cut first-transfer abandonment from 44 to 30 percent within one quarter.
- Audience: Nigerians aged 25 to 40 sending money to family abroad, currently using a competitor, who assume all transfer fees are hidden until the last screen.
- Single message: You see the exact fee before you confirm.
- Support: Fee shown on the first screen. No deductions on arrival. Published rate table.
- Mandatories: License number in all assets. No comparative fee claims against named competitors. ARCON clearance before any paid exposure.
- Deliverables: One 60-second hero film, three cutdowns, six verticals, twelve stills, one landing page asset set.
- Channels and budget: 60 percent paid social, 30 percent search, 10 percent influencer. Budget stated, split stated.
- Measurement: Primary metric is completed first transfers. Baseline 56 percent completion. Weekly reporting, full read at close plus two weeks.
That fits on two pages. A second advertising campaign brief example for a different objective would keep the same nine headings and change only the content underneath.
Brief, proposal, and strategy are three different documents
The advertising campaign brief, the proposal, and the strategy get confused constantly, and each has a different author.
| Document | Written by | Answers |
|---|---|---|
| Advertising campaign brief | Client or campaign lead | What problem are we solving |
| Proposal | Agency | How we would solve it, and what it costs |
| Advertising campaign strategy | Agency planner | Why this approach will work |
An ad campaign proposal template is the agency’s response document, covering approach, scope, team, timeline, and fees. If you are hiring out and want an ad campaign proposal template to compare bids fairly, send the same brief to everyone and ask for the same headings back. Comparing differently structured proposals is guesswork.
Advertising campaign strategy sits between the two. It is the reasoning that connects the problem in the brief to the creative in the proposal, and it is the thing you should ask to see before approving a concept.
Advertising campaign development then covers everything from approved concept to finished assets: scripting, casting, production, edit, and versioning. Where agencies sell advertising campaign services as a bundle, advertising campaign development is usually the largest line in it.
Advertising campaign management is a fourth, separate thing again: the in-flight work of trafficking assets, monitoring spend, rotating creative, and producing reports. Some agencies include advertising campaign management inside their advertising campaign services; many do not. Ask before you assume.
How we brief campaigns at Mastermind CC
We do not start production until the problem, the message, and the metric are on one page and signed.
Campaign work rarely fails at the shoot. It fails when the concept was approved against an unresolved brief and the disagreement surfaces in the edit.
Our campaign for Africhange on International Men’s Day is a useful reference for what a tight brief produces: a single occasion, a defined audience, one message, and a delivery set built for the channels it actually ran on. Longer-form work follows the same discipline, including the series we produced for Culture Custodian across two years.
Frequently asked questions
How long should an advertising campaign brief be?
Two pages, including the example above. If it runs longer, the strategy is usually still being worked out inside the document, which is the wrong place for it.
Who should write it, the client or the agency?
The client writes it, the agency interrogates it. Agencies that write their own briefs end up answering their own questions, which defeats the point.
What if we do not have a baseline number?
Say so in the brief and agree a measurement period to establish one. A stated unknown is workable. A missing baseline discovered at the reporting stage is not.
Can one brief cover several campaigns?
No. Different objectives need different briefs, even for the same brand in the same quarter. Sharing a brief across campaigns is how a single message becomes four.
Should budget go in the brief?
Yes, and as a real number. Withholding it to see what agencies propose produces work you cannot afford and a round of revisions you pay for anyway.
What is the difference between mandatories and brand guidelines?
Guidelines describe how the brand looks and sounds in general. Mandatories are the specific things this campaign must include or avoid, usually for legal or regulatory reasons.
How early should regulatory clearance be planned?
Before the shoot, not after the edit. Clearance timelines are outside your control, and a rejected claim discovered in post means reshooting rather than rewording.
Writing yours this week
Open a blank page, write the nine headings from the table above, and fill in the problem and the single message first. Those two are the hardest, and everything else in the advertising campaign brief follows from them.
Then give the draft to someone outside the project and ask them to say the message back to you in their own words. If they cannot, the brief is not finished, and no amount of production budget will fix that later.
If you have the problem defined and want help turning it into a campaign, send us the brief and we will come back with the approach, the production plan, and what it costs.
