Leaving a marketing agency is normal and usually overdue by the time it happens. What makes it expensive is not the decision — it is discovering during the handover that you do not actually own the things you assumed you did.
Before leaving a marketing agency, check this
Log in and confirm, on your own account:
- The ad accounts are owned by your Business Manager, with the agency added as a partner. Not the other way round.
- The pixel and datasets sit in your assets, with their full history.
- The Google Ads account is yours, with the agency linked as a manager.
- Analytics, Tag Manager and Search Console are owned by an email address at your domain, not someone's personal Gmail.
- Your product feed is in your Merchant Center.
- Creative files — the editable versions, not just exported JPEGs.
If any of these are held by the agency, fix it while the relationship is still good. Asking for ownership after giving notice turns an administrative task into a negotiation.
An agency that holds your ad account is not protecting you from complexity. The offboarding fight is how some of them keep clients.
Take these before you go
Export the last two years of performance data at campaign and ad level. Save the search terms reports. Download the creative library. Screenshot the account structure. Get the decision history if one exists — which it usually does not, and that absence is itself informative.
Audience lists are the one thing you cannot export. Custom audiences and remarketing lists live in the account; if the account is yours, they survive. If it is not, they do not, and rebuilding them takes months.
Do not let the new agency rebuild on day one
This is where the three months get lost. A new team arrives, dislikes the structure, and tears it up in week one. Every ad set re-enters the learning phase simultaneously, performance collapses, and everybody spends a quarter recovering ground the previous agency had already paid for.
A good incoming team reads before changing: audit first, verify tracking, fix anything actively losing money, then restructure once with the reasoning written down. If your new agency wants to rebuild immediately, ask them why — and listen carefully to the answer.
Overlap by two weeks if you can
Not for the outgoing agency's benefit. For the handover call where someone explains why the account is built the way it is. Half an hour of that saves the new team a month of guessing.
Be straight about why you are leaving
If results were the problem, say so plainly. If it was communication, say that. Agencies improve from specific feedback and get nothing from "we are taking it in-house" when you are not.
It also matters for you: if the real problem was that nobody told you the truth about what was and was not working, that is the first thing to test when you interview the next one.
What good looks like from the other side
Thirty days' notice, no exit fee, nothing to hand back because you already own it, and an honest handover. That is the standard to hold anyone to. Ours is written up on the process page, and what we charge is on pricing — both published so you do not have to ask.
The single thing that decides how painful an exit is, is settled long before notice is served: whether you own the ad accounts. It belongs in writing, alongside the other clauses that only matter at the end, and a maintained access record turns the handover into an afternoon of administration.
Questions people ask
What do I lose if I change agencies?
Nothing, if you own the ad accounts, the pixel and the analytics property. Everything expensive — conversion history, audiences, year-on-year reporting — if the accounts were created under the agency’s business.
How much notice should I give?
Whatever the contract says, and ideally with a fortnight of overlap so the incoming team can watch the account before taking it over. Overlap costs one extra invoice and saves considerably more than that in lost performance.
Should I tell them why I am leaving?
Yes, plainly. It costs you nothing, it occasionally produces a fix you had not expected, and it makes the handover cooperative rather than grudging.
Should the new agency rebuild everything on day one?
No. A rebuild resets the learning on every campaign, so it should follow a diagnosis rather than precede one. An incoming agency that wants to start from scratch before reading the account is managing its own convenience.