How to Brief a Media Agency When You Don’t Know Where to Start

Part of our series on growing your brand without a giant budget.

If you have never briefed a media agency before, that first conversation can feel daunting. How much detail do you need? What if you get it wrong? Here is the reassuring part: a strong brief is not about complexity. Research from the IPA and BetterBriefs found that UK marketers waste more than a quarter of their budget on poor briefs and misdirected work, and that almost three quarters of agencies say the briefs they receive from clients are not good enough. The businesses that get the most from their agency relationships are not always the ones with the biggest budgets. They are the ones who walk in prepared.

This guide sets out exactly what to bring to that first conversation, the mistakes worth avoiding, and a simple checklist you can run through beforehand.

What your agency actually needs from you

You do not need a polished document. You need clear answers to six questions. Work through these before you pick up the phone, and your agency can spend its time on strategy and ideas rather than trying to fill in the gaps.

• Your business context. The honest version, not the website version. How long have you been trading? What has worked in marketing so far, and what has not? Are you trying to grow, hold steady, or break into a new market?
• A clear, measurable objective. “More enquiries” or “better brand awareness” are outcomes, not objectives, and no agency can brief against them. Try something specific instead: increase qualified enquiries by 30% in six months, or generate 50 leads a month at a cost per lead under £40.
• Your target audience. Go beyond age and location. Who has the problem you solve, and what does their life look like just before they find you? If you have data on your best customers, bring it along.
• A realistic budget range. You do not need an exact figure, but you do need a range. Without one, your agency is scoping in the dark, and will usually plan for the higher end. Be clear, too, on whether that budget covers agency fees, media spend, or both.
• Your timeline and expectations. When do you need to see results? What does success look like at 30, 60 and 90 days? Flag any fixed dates, such as a launch or a seasonal peak, from the outset.
• Your brand and previous agency experience. Share any brand guidelines, tone of voice notes or examples of work you admire. If you have worked with an agency before, be upfront about what worked and what did not. It is not about criticising anyone, it is about helping the new relationship start on the right foot.
• What kind out outcomes would genuinely make you happy. This is an opportunity to go beyond the figures on the paper, use it as a way to discuss what your media ambitions are.

The mistakes that quietly cost you the most

None of these mistakes feel dramatic in the moment. They just mean your agency is working with less than they need, which shows up later as wasted spend, missed timelines, or work that misses the mark.

Strategy mistakes

• Setting unclear objectives. Wanting “more enquiries” rather than a measurable goal leaves your agency guessing at what a win actually looks like.
• Treating the brief as a box-ticking exercise rather than a two-way conversation. The best briefs are a starting point for discussion, not a form to be filled in and forgotten.
• Booking something purely because a competitor is doing it, without asking whether it is right for your brand and your objectives.
• Chasing “shiny new things” for the same reason. New formats and platforms are worth exploring, but only if they earn their place in your plan.
• Continuing to book the same thing simply because it is what you have always done. Familiarity is not the same as effectiveness.

Information mistakes

• Withholding your budget. It rarely protects you from a high quote, it just means your agency is scoping blind.
• Missing historical or business context. Your agency cannot build on what has worked, or avoid what has not, if they do not know about it.
• Giving no real target audience detail. A vague audience produces a vague campaign.

Format and planning mistakes

• Trying to force one type of creative into another format, for example squeezing a TV ad into radio, or an out-of-home billboard into an MPU. Each format is built differently, and work that has not been adapted properly rarely lands as intended.
• Not considering the incremental effect of running campaigns across more than one channel at the same time. Channels working together often outperform the sum of their parts, and that is worth planning for, not discovering by accident.

Measurement mistakes

• Expecting only quick results. Some channels, and some objectives, take longer to show their full effect.
• Measuring sales, bookings or leads alone, and never brand lift. Short-term numbers only tell half the story of whether your marketing is working.

What good briefing looks like in practice

• Meet your agency, do not rely on email alone. A call or a face-to-face conversation lets you both ask follow-up questions and think out loud in a way that email never quite allows.
• Be open about what has worked and what has not. Share the things you have always wanted to try, and the things you wish had gone better. Your agency can only build on a true picture.
• Share your creative direction early. Even rough thinking helps your media agency start considering the right formats and placements sooner, rather than working it out after the creative is finished.
• Be open to new ideas. You know your business best, but your agency sees what is working across the wider market. The best results tend to come from the two of you meeting in the middle.

Your brief-ready checklist

Run through this before your next call with an agency, new or existing.

• Your business story in a few honest sentences: how long you have traded, what has worked, what has not
• One clear, measurable objective
• A description of your target audience that goes beyond basic demographics
• A realistic budget range, and whether it covers fees, media spend, or both
• Your timeline, and what success looks like at 30, 60 and 90 days
• Any brand guidelines, tone of voice notes or examples of work you like
• An honest account of your previous agency experience, good and bad
• A meeting booked in, not just an email sent
• An open mind for ideas you had not already considered

Not sure where to start with your own brief?

Book a free, no-obligation conversation with Hurst Media Agency and we will help you work through exactly what we need to get your campaign off to the right start. Drop us an email at sales@hurstmediaagency.co.uk and we will be happy to chat about what would work for you.