Most CMOs who know they need to switch agencies wait longer than they should. The transition feels complex, the timing never seems right, and there’s a natural fear of disruption. So they stay — and they pay for it in underperforming campaigns, flat pipeline, and eroding confidence from leadership.
The math is almost always the same: a well-managed agency transition costs a fraction of 12–18 more months with an agency that isn’t delivering. Once you’ve made that calculation clearly, the timing question gets a lot easier to answer.
Phase 1: What to Do Before You Give Notice
Audit Everything Your Agency Owns
Before you end the relationship, do a thorough inventory of everything your current agency manages: ad accounts, analytics access, CRM integrations, creative assets, domain tracking configurations, email lists, and brand guidelines.
Agencies sometimes restrict access during or after transitions. Having a complete picture before you give notice means you can plan the handoff precisely — and avoid being held hostage to their cooperation at the worst possible moment.
Identify Your Continuity Risks
Which programs are actively contributing to pipeline right now? Those are the ones you can’t afford to pause. Identify them specifically and build a transition plan that keeps them running through the switch. Everything else can wait. These can’t.
Define the New Agency’s Onboarding Scope
Before the new agency starts, define exactly what they need to learn, what access they need, and what they’ll own in the first 30 days. The more structured the onboarding, the faster they can produce results — and the less momentum you lose in the gap.
Phase 2: Managing the Transition Period
Run Parallel If the Budget Allows
If possible, run old and new agency activities in parallel for four to six weeks. The new agency gets up to speed while existing programs keep running. It’s not always feasible — but when it is, it’s the cleanest approach and eliminates most of the transition risk.
Protect Your Paid Programs
Paid search and paid social have learning periods. Most platforms take two to four weeks to re-optimize after significant changes. Brief the new agency to rebuild campaigns carefully, maintain continuity in targeting and audience definitions, and avoid sudden budget shifts that reset platform algorithms and cost you weeks of performance data.
Don’t Let SEO Stall
Organic search compounds over time, and a pause in content production or technical work can reverse momentum that took months to build. Make sure the new agency has a clear SEO brief and is ready to publish from week one — not week six.
Establish Reporting Continuity Before the Handoff
One of the most common transition failures is a reporting gap. The old agency stops sending reports, the new one isn’t set up yet, and suddenly you have a quarter with no data to show leadership. Set up your GA4 dashboards and CRM access before the transition begins and ensure the new agency is in the system from day one.
Phase 3: Setting the New Relationship Up for Success
Invest in Deep Onboarding
The agencies that produce results fastest are the ones that understand your business fastest. Don’t shortchange this. Product deep dives, customer interviews, competitive landscape reviews, sales call observations, historical campaign analysis — the more context the new agency has, the better every decision they make from day one.
Set Specific 90-Day Expectations
Agree explicitly on what success looks like in the first 90 days — not in vague terms, but in measurable ones. CPL below a defined threshold. Pipeline contribution above a defined target. MQL-to-SQL rate at a defined benchmark. Specificity creates accountability. Vague expectations create cover for underperformance.
The Transition Mistakes That Cost the Most
Giving notice before the new agency is locked in. This creates pressure and leads to poor hiring decisions. Have the replacement selected and ready before the conversation happens.
Skipping the asset audit. Not knowing what your current agency controls — and not securing access before the transition — is one of the most avoidable and most painful mistakes a marketing leader can make.
Expecting immediate outperformance. A new agency needs time to learn your business and optimize your programs. What took your old agency 12 months to build won’t be replicated in 30 days. Set realistic timelines and build the first 90 days around learning, not just execution.
Pausing everything during the transition. A clean break sounds appealing. A pipeline gap doesn’t. Keep your highest-performing programs running through the switch, even if it means some overlap.
Frequently Asked Questions
How long does it take to switch marketing agencies?
A well-managed transition typically takes 60–90 days from the decision to full operational handoff. That includes four to six weeks of preparation before giving notice, a parallel run period if budget allows, and a structured onboarding phase with the new agency. Rushing it produces the gaps and performance dips most leaders fear. Planning for it eliminates most of the risk.
What should I do with my ad accounts when switching agencies?
Make sure you own them. Ad accounts — Google Ads, Meta, LinkedIn — should be in your name or your company’s name, not the agency’s. If they’re not, reclaiming ownership is the first step. Brief the new agency to rebuild campaigns carefully rather than making sweeping changes immediately; platform algorithms need time to re-learn after significant disruptions.
How do I avoid a pipeline gap when switching agencies?
Identify your highest-performing programs before the transition begins and build a continuity plan around them. Run parallel activity during the handoff period where possible. Keep SEO publishing on schedule. And establish reporting infrastructure before the old agency goes dark so you’re never flying blind during the transition.
What should I look for in a replacement agency?
An agency that leads with strategy before services, has demonstrated results in your category, and is willing to be accountable to revenue outcomes — not just deliverables. The onboarding conversation should feel like a business discussion, not a sales pitch. If they’re asking about your goals, your competitive landscape, and what hasn’t worked before, that’s a signal. If they’re leading with packages and pricing, that’s a different signal entirely.
The Upside Is Worth It
Done well, an agency transition is one of the highest-leverage moments in a marketing leader’s year. You get to reset the strategy, fix what wasn’t working, and build a relationship genuinely structured for performance.
The transition cost is real but temporary. The upside, with the right partner, compounds.
About the Author
Dan Enrico has spent nearly two decades doing one thing: building marketing programs that produce results senior leaders can take to their board. As Vice President of Strategy at DSM, he works directly with CMOs and marketing leaders across New Jersey and nationally to find where marketing investment is falling short, uncover where the real growth opportunity lives, and build the integrated strategy to go after it. Dan doesn’t wait to be told what to do. He shows up with a point of view, backs it with data, and stays accountable to the outcome. That’s the standard he holds himself to — and the standard every DSM client should expect.