Changing SEO agency is riskier than changing most suppliers, because your outgoing agency may hold things you need and have no commercial reason to make the transition smooth. Most of that risk is avoidable, but only if you do things in the right order.
The single most important point: secure your access before you give notice. Almost every horror story in this area starts with someone sending the termination email first.
Before You Give Notice
Work through this list while the relationship is still cordial. None of it is unreasonable to ask for and all of it is harder to get afterwards.
Confirm you own your Google Search Console property. Not delegated access — ownership. If the agency is the verified owner, you are relying on their goodwill for the single most valuable dataset you have. Verify your own ownership independently, through DNS or a file on your server, and check that you are listed as an owner rather than a user.
Confirm you own your analytics. You should hold administrator rights on the property itself, not just editor access to a view.
Check your Google Business Profile. Agencies sometimes create or claim these. If the agency is the primary owner, transfer it to yourself now. Losing a Business Profile with years of reviews is the most painful version of this problem.
Audit any other accounts. Rank tracking, call tracking, heatmap tools, a content management plugin licence. Note which are in the agency's name and which you pay for directly.
Export your data. Twelve months of Search Console performance data at minimum — queries, pages, countries, devices. Search Console only retains sixteen months, so this is your historical baseline and it cannot be recreated later. Also export your analytics reports and any rank tracking history.
Collect the work product. Audits, keyword research, content briefs, the link profile they built, the technical backlog with its current state. If your contract says you own the work, ask for it in a usable format.
Document what is in flight. Which pages are mid-build, which outreach is live, which technical tickets are with your developers. This is the detail that gets lost in a handover and causes a visible gap.
Check What the Contract Says
Read it properly before you act, specifically for:
Notice period. Thirty days is common; some agencies ask for ninety. This determines your timeline, and it is the reason to start the process before you are frustrated enough to want out immediately.
Who owns the content and the work. Ideally you, unambiguously. If it says otherwise, you need to know before you plan a transition.
Whether anything reverts on termination. Some agreements allow an agency to remove links they built or content hosted on their own properties. Unpleasant, legal if you signed it, and much better to know in advance.
Payment terms on exit. Whether work in progress is billable, and whether anything is payable in advance.
If the terms are genuinely restrictive, take advice before giving notice rather than after.
Overlap, Do Not Gap
The most common cause of a dip during a switch is simply that nothing happened for six weeks.
Two approaches work. The better one is a short paid overlap, where your new agency starts their audit and planning while the outgoing agency serves its notice. You pay twice for a few weeks and the work never stops. The alternative is to appoint the new agency before giving notice, so they are ready to begin the day the notice period ends.
What does not work is giving notice, then starting a procurement process. Selection takes weeks, onboarding takes weeks, and your campaign is idle for the whole of it. Momentum in SEO is real: content stops being published, technical tickets stop moving, outreach stops. Nothing dramatic happens immediately, and then a quarter later you are behind.
What to Tell the New Agency
Be more candid than feels comfortable. The brief that gets you a good transition includes:
What actually went wrong. Not "they underperformed" — specifics. No reporting, work never shipped, nobody senior involved after month two, strategy that never changed. A new agency needs to know what to avoid.
The real history. Previous penalties, aggressive link building, mass-produced content, a migration that went badly. Agencies find this out in week one regardless, and hiding it just wastes the first month.
Your baseline, dated. The data you exported. Insist that the new agency records a starting position in writing before they change anything, so the question of whether they improved things has an answer.
What is half-finished. The in-flight list from earlier.
Who internally can approve things. Content sign-off and development capacity are the two constraints that most often stall a new engagement.
The First Thirty Days With the New Agency
A good start looks diagnostic rather than busy.
They should audit before proposing — crawl the site, check index coverage, review what the previous agency built, and assess whether any of it is a liability. That last point matters: inherited link profiles and content sometimes need remediating rather than building on, and you want that identified in month one, not month seven.
You should end the first month with a dated baseline, an assessment of what you inherited, a prioritised plan with owners, and agreed reporting. If instead you receive a content calendar in week one, they skipped the diagnosis.
Our note on what a month-one SEO engagement should contain covers deliverables generally, and what to look for when choosing an SEO agency covers the selection itself. If you are leaving because of specific behaviours, SEO agency red flags is worth a read to make sure you are not about to buy the same problem twice.
Common Pitfalls Worth Naming
Expecting an instant improvement. A new agency inherits whatever state the site is in. If the previous twelve months were wasted, the first three months of the new engagement are partly spent catching up.
Blaming the new agency for an inherited drop. If traffic was already declining, that trend continues for a while regardless. This is exactly why the dated baseline matters — it separates what you inherited from what they did.
Switching too often. SEO compounds, and every switch costs you a diagnostic period. Two agencies in eighteen months is sometimes necessary and frequently a sign the brief or the internal capacity is the real problem.
Not fixing the internal cause. If the last agency's technical recommendations never got implemented because you have no development capacity, the next agency's will not either. Fix that before you appoint, or appoint someone who implements rather than advises.
That last one is worth sitting with. A meaningful share of failed SEO engagements fail on the client side, and changing supplier does not change it. If you want an honest read on whether your site's problem is the agency or the setup around it, our free SEO audit will tell you what state the site is actually in before you make any decision.
Frequently Asked Questions
How do I switch SEO agencies without losing rankings?
Secure your own ownership of Search Console, analytics and your Google Business Profile before you give notice, export twelve months of Search Console data as your baseline, collect the work product and document what is in flight. Then overlap the two agencies rather than leaving a gap between them.
What should I secure before leaving my SEO agency?
Verified ownership of Search Console and administrator rights on analytics, primary ownership of your Google Business Profile, exported performance data, your audits, keyword research and content briefs, the technical backlog with its current state, and a list of work currently in progress.
Will switching agencies hurt my rankings?
Not inherently — the damage comes from the gap. If nothing is published, no technical work ships and no outreach happens for six weeks, the loss of momentum shows up a quarter later. A short paid overlap between agencies avoids almost all of it.
What should I check in my contract before giving notice?
The notice period, who owns the content and work produced, whether anything reverts to the agency on termination such as links or hosted content, and how work in progress is billed. If the terms look restrictive, take advice before giving notice rather than after.
How long before a new SEO agency shows results?
They inherit the site's existing state, so if the previous year was wasted the first months partly go on catching up. Expect diagnosis and technical fixes first, with meaningful movement from month four onwards — and insist on a dated baseline at the start so inherited decline is not mistaken for their performance.