What marketing teams get wrong when briefing a web dev agency

You've got the budget approved. You've picked an agency. Now you need to brief them on what you want built. This is where most marketing teams accidentally sabotage their own project.

After years of working as an extension of marketing teams, we've seen the same mistakes tank timelines, inflate budgets, and produce websites that nobody's happy with. Here's what goes wrong, and how to fix it.

1. You brief a website instead of a strategy

The most common mistake: handing over a list of pages you want built. "We need a homepage, about page, services page, blog, and contact form."

That's not a brief. That's a table of contents.

A good brief starts with why. What is your website supposed to do for the business this quarter? Are you trying to capture demo requests? Establish authority in a new market? Reduce support tickets? Your dev team can't make smart decisions about layout, hierarchy, or functionality without understanding the business objective behind the build.

Fix it: Lead with goals and KPIs. Let your agency propose the structure that achieves them.

2. You over-specify the design, under-specify the user

"We want it to look like Apple's site" tells an agency almost nothing useful. What is useful: who's landing on this page, where they came from, what they need to understand in 5 seconds, and what you want them to do next.

Marketing teams tend to brief visuals (colors, fonts, animations) while glossing over user journeys. But a beautiful site that confuses your buyer is just expensive art.

Fix it: For every key page, define the audience segment, their intent, and the desired action. Let the design serve those, not the other way around.

3. You treat content as a follow-up task

"We'll get you the copy later." Famous last words.

Content dictates design. Headlines determine hierarchy. The length of your value prop affects layout. When you brief an agency without content (even draft content), they're designing containers for mystery cargo. Then when real copy arrives, nothing fits, and you're paying for revisions.

Fix it: Brief content direction upfront, even if it's rough. Messaging frameworks, key phrases, approximate word counts. Give your agency something to design around.

4. You forget that your website will need to change

This is the big one. Most briefs describe a website as a finished product: "Build this, hand it over, done." But your marketing strategy isn't static. Your campaigns shift quarterly. New products launch. Messaging evolves.

If your brief doesn't account for how the site will grow and adapt, you'll end up with something rigid that's outdated within months.

Fix it: Brief for flexibility. Tell your agency what's likely to change. Ask how the site will be structured to accommodate evolution without a full rebuild every 18 months.

5. You don't share what failed before

Your agency is flying blind if they don't know what you've already tried. That previous site that "didn't convert"? The landing page that underperformed? That's gold. It tells your team what to avoid and where the real problems live.

Marketing teams often want to start fresh and forget the past. But without context on what didn't work, your agency might build the same mistakes with a prettier coat of paint.

Fix it: Share your analytics. Show them your worst-performing pages. Tell them what you think went wrong. A good agency will dig into that and come back with a sharper strategy.

6. You brief once and disappear

A brief isn't a document you hand off and check back in 6 weeks. The best website projects happen when the marketing team stays involved, not micromanaging, but collaborating. Weekly check-ins. Quick feedback loops. Shared context when campaigns shift.

The agencies that do their best work are the ones treated like an extension of your team, not a vendor you toss requirements over the fence to.

Fix it: Plan for ongoing collaboration from day one. Build feedback rhythms into the timeline. Keep your agency in the loop on broader marketing shifts.

The bottom line

A great brief isn't just thorough documentation. It's thorough context. Share your goals, your audience, your content direction, and your appetite for change alongside the specs. Then let your web team do what they do best: turn strategy into a site that actually works.

The marketing teams that get this right don't just get better websites. They get a partner who can move as fast as they do.