You've looked at the evidence. You've spotted the red flags. You've audited your agency's activity. And you've made the decision: it's time to switch.
But now comes the anxiety. What happens to your campaigns? What about your conversion data, your audience lists, your historical performance? Will everything break?
The good news: switching Google Ads agencies doesn't have to mean starting from scratch. Your account, your data, and your campaign history all belong to you. Here's exactly how to make the transition cleanly.
First: you own your Google Ads account
This is the single most important thing to understand. Your Google Ads account belongs to you, not your agency.
A good agency manages your account under your ownership. They have access — typically through a Google Ads Manager (MCC) account — but removing that access doesn't delete anything. Your campaigns, keywords, ads, conversion data, audiences, and entire change history remain exactly where they are.
If your agency set up a separate Google Ads account under their MCC and runs your campaigns from their account, that's a different situation (and a red flag in itself). More on that below.
The 8-step transition checklist
Here's the process I recommend to every client switching agencies. Follow these steps in order and you won't lose a thing.
1 Confirm you own the Google Ads account
Log into ads.google.com with your own Google account. If you can see your campaigns, you own the account. If you can only access through your agency's login, you need to fix this first — ask your agency to transfer ownership to your Google account.
2 Audit before you leave
Before you tell your current agency anything, pull your change history data. Export it as a CSV and run it through our free audit tool. This gives you a baseline of exactly what your agency has (or hasn't) been doing, which is invaluable context for your new agency.
- Export change history for the last 6–12 months
- Download your search terms report for the last 90 days
- Screenshot your conversion tracking setup
- Note your current campaign budgets and bid strategies
3 Document your conversion tracking
This is where most transitions go wrong. Your conversion tracking setup is the brain of your account — it tells Google which clicks are valuable. Before switching:
- List every conversion action in your account (Google Ads → Goals → Conversions)
- Note which are primary vs. secondary conversions
- Check whether tracking is via Google tag, Google Tag Manager, or imported from GA4
- If using offline conversions, document the upload process and source
If your agency installed tracking code, you need to know where it lives. Ask them directly: "Where is the Google Ads conversion tag installed, and how?" Get this in writing.
Switching agencies? Start with the data.
Upload your Google Ads Change History CSV and see exactly what your current agency has been doing. Free, private, instant.
Audit Your Current Agency How to export your change history4 Check your Google Tag Manager access
If your campaigns use Google Tag Manager (GTM), make sure you have admin access to the container. Many agencies set up GTM under their own account, which means you could lose access to your tracking when you part ways.
Go to tagmanager.google.com and check if you can see and edit the container for your website. If not, ask your agency to grant you admin access before you give notice.
5 Secure your Google Analytics access
Same logic applies to Google Analytics 4 (GA4). Verify you have admin access to your property. If your agency set it up, they may be the only admin. You need this for conversion imports and to maintain your attribution data.
6 Onboard your new agency first
Here's the key timing trick: get your new agency set up before removing the old one. Grant your new agency access via their MCC account (they'll give you a customer ID to link). Both agencies can have access simultaneously — there's no conflict.
This overlap period lets your new agency review the account, ask questions, and plan their approach while campaigns keep running normally.
7 Remove old agency access
Once your new agency is comfortable and ready to take over management:
- Go to Google Ads → Admin → Access and security
- Find your old agency's manager account
- Click "Remove access"
This is instant and non-destructive. Nothing gets deleted. Your old agency simply can't log in anymore.
8 Verify everything still works
In the first 48 hours after the switch, check:
- Conversion tracking is still firing (check real-time reports in GA4)
- Campaigns are still running and serving ads
- Budgets and bid strategies haven't changed
- No automated rules or scripts from the old agency are doing unexpected things
What if your agency owns the account?
This is the nightmare scenario, and it's more common than you'd think. Some agencies create Google Ads accounts under their own MCC and run your campaigns from an account they control.
If this is your situation:
- You cannot simply revoke access — the account is theirs
- Your campaign history, conversion data, and audience lists are trapped in their account
- You'll need to start a new account (your data doesn't transfer between accounts)
- Ask your agency to share historical data exports before you leave
This is why it matters who owns the account from day one. If you're evaluating a new agency and they want to run campaigns from their own account rather than yours, consider that a red flag.
What your new agency should do in week one
A competent new agency will spend their first week reviewing, not changing. Here's what good onboarding looks like:
- Full account audit — reviewing campaign structure, keyword strategy, and historical performance
- Conversion tracking review — verifying everything is firing correctly and tracking the right actions
- Search terms review — checking for wasted spend on irrelevant queries
- Change history review — understanding what the previous agency was (or wasn't) doing
- Strategy presentation — a clear plan for what they'll change, why, and what results to expect
If your new agency immediately starts making wholesale changes without this review period, that's its own red flag.
Common fears (that you don't need to worry about)
"Will I lose my Quality Scores?"
No. Quality Scores are tied to keywords in your account, not to who manages it. Switching agencies doesn't reset them.
"Will my conversion data disappear?"
No. All historical conversion data stays in the account. The only risk is if the tracking code itself is removed from your website — which is why step 3 above is critical.
"Will there be a performance dip?"
Possibly a small one during the transition period, especially if the new agency makes significant changes to bidding or structure. A good agency will make changes gradually and communicate expectations clearly. But if your previous agency was doing nothing, even a brief dip is worth it for an agency that's actually managing your spend.
"What about my remarketing audiences?"
Audiences are tied to your Google Ads account. They don't go anywhere. If your audiences were built through GA4, make sure your GA4 property stays connected to your Google Ads account (step 5).
The bottom line
Switching agencies feels scarier than it is. The data is yours. The account is yours. The campaigns are yours. A new agency gets access to everything the old one had — every keyword, every ad, every conversion, every piece of history.
The hardest part isn't the technical transition. It's making the decision. If you've already done the audit and seen what your agency has (or hasn't) been doing, you have everything you need.
Not sure if it's time to switch?
Upload your Google Ads Change History and get an objective score of your agency's activity. It takes 60 seconds and your data never leaves your browser.
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