Change SEO agencies badly and you can undo eighteen months of ranking progress in a single quarter. Not because the incoming team is worse than the outgoing one, but because nobody owned the fortnight in between. The switch itself is almost never what costs you visibility. The gap is.
That gap has a predictable shape. Notice gets served on a Friday, the outgoing agency quietly stops shipping work, the accounts they created stay in their name, and the new team spends its first six weeks rebuilding context that already existed. Meanwhile organic search keeps moving. Competitors keep publishing. Nothing dramatic happens on day one, which is exactly why the damage is usually noticed a month too late to attribute properly.
The good news is that this is a process failure, not a market force. Businesses that change SEO agencies to a written plan tend to hold their rankings flat through the transition and are back on trajectory within a quarter. Businesses that change SEO agencies by simply cancelling one invoice and signing another routinely lose ground for two to three months, and some of that loss is permanent because the assets that produced it were never theirs.
This guide is the plan. It covers what to audit before you give notice, which accounts you must own, the contract clauses that decide whether a handover happens at all, how to run a paid overlap, and what to measure in the first ninety days. Every figure in the charts below is arithmetic on a number stated in the text, so you can substitute your own retainer and rerun it.
One caveat before the detail: this is a plan for how to change SEO agencies, not an argument that you should. If you are still deciding whether to move at all, our guides to SEO agency versus in-house versus freelancer and realistic SEO timelines are the better starting point, because a switch made for the wrong reason costs exactly as much as one made for the right reason.
Table of contents
- Why UK Businesses Change SEO Agencies
- What Actually Causes Ranking Loss When You Change SEO Agencies
- Before You Change SEO Agencies: The Pre-Exit Audit
- Own Your Accounts: Access, Data and Portability
- Reading the Contract Before You Change SEO Agencies
- The Overlap Month: How to Change SEO Agencies Safely
- What Transfers When You Change SEO Agencies and What Does Not
- The Technical Handover Checklist Before You Change SEO Agencies
- The First 90 Days With the New Agency
- Measuring Whether the Change Worked
- What It Costs to Change SEO Agencies
- Mistakes That Cost Rankings When You Change SEO Agencies
- Frequently Asked Questions
- References
Why UK Businesses Change SEO Agencies
Most decisions to change SEO agencies are not caused by a single catastrophe. They are caused by eighteen months of small frustrations that finally cross a threshold, usually during a budget review — which is why the reason people give and the reason that actually matters are often different.
The reasons that genuinely justify a move
Flat or declining organic performance over two or more quarters, with no diagnosis offered, is the clearest reason to change SEO agencies. So is a change in what your business needs: an agency that was excellent at local visibility may be the wrong partner once you sell nationally. Persistent reporting that describes activity rather than outcomes — hours logged, blogs written, “keywords tracked” — is a legitimate reason to change SEO agencies, because it means nobody on the account can tell you what is working.
The reasons that usually do not
Impatience is the big one. Teams change SEO agencies at month five of a programme that was always going to take nine, then repeat the mistake with the next supplier, and spend three years permanently in ramp-up. A single bad month is not a signal. Neither is a competitor’s press release. Our guide on warning signs of an underperforming provider sets out how to tell a genuine performance problem from a communication one.
The reason nobody says out loud
Sometimes the relationship is fine and the price is not. That is a renegotiation, not a switch — and it is worth attempting first, because the cheapest transition is the one you do not have to run. Read our SEO pricing models guide before you conclude that your rate is wrong.
What Actually Causes Ranking Loss When You Change SEO Agencies
It is worth being precise about the mechanism, because the popular explanation — that Google “notices” a new agency — is wrong. Google has no idea who your supplier is. What it notices is the consequences of how you change SEO agencies, and there are only four of them.
Publishing simply stops
The most common cause of a visibility dip has nothing to do with technical damage. It is that content output falls to zero for six to ten weeks while notice is served, a new contract is signed and a new team is onboarded. If your growth was coming from publishing twelve pages a quarter, publishing zero for a quarter shows up. Most businesses that change SEO agencies never plan for this window at all.
Work-in-progress dies mid-flight
Half-migrated redirects, a schema rollout applied to four templates out of nine, an internal linking project three sections deep. Partial technical work is often worse than no work, and it is exactly the sort of thing that never appears in a handover pack because it was never finished.
Access is withdrawn before it is transferred
When the outgoing agency owns the Search Console property, the analytics account or the tag container, revoking their access can remove yours too. Historical data disappears, comparison baselines vanish, and the new team cannot tell a transition dip from a pre-existing decline. Verifying this one thing before you change SEO agencies prevents more damage than any other single step in this guide.
Somebody makes an unsupervised change
A new agency keen to demonstrate impact rewrites title tags across the site in week two. Sometimes that helps. Often it moves a page that was ranking on an established, well-linked title into an untested one. Google’s own guidance on debugging search traffic drops is the right reference here, and its first instruction is to establish what changed and when — which is impossible if you changed forty things in a fortnight.
Before You Change SEO Agencies: The Pre-Exit Audit
Everything that protects you happens before notice is served. Once the outgoing agency knows they are leaving, your leverage and their motivation both drop sharply — so the work required to change SEO agencies safely starts while the relationship is still entirely normal.
Capture the baseline while you still have full access
Export, and store outside any agency-controlled system: twelve months of organic sessions and conversions by landing page, twelve months of Search Console query and page data, current rankings for your top hundred terms, and a full crawl of the site as it stands today. This is the evidence you will use in ninety days to prove whether the decision to change SEO agencies worked. Nobody who forgot this step has ever been able to reconstruct it.
Inventory what the current programme actually contains
Ask for the live content calendar, the current technical backlog with priorities, the list of pages changed in the last six months, and any active link or PR campaigns with their outstanding commitments. You are not being adversarial. You are establishing what is in flight so it can be caught rather than dropped.
Get an independent read before you decide
An external technical audit commissioned before you change SEO agencies does two useful things. It tells you whether the problem is your agency or your website, which are very different problems. And it gives the incoming team a starting document that was not written by either party’s marketing department. Our technical SEO audit checklist covers what a credible one contains.
Decide what “success” means in writing
Before you change SEO agencies, write down the three numbers that would make the switch obviously correct in twelve months, and the three that would make it obviously wrong. Do it now, while you are annoyed and honest, rather than in month nine when the new agency is presenting.
| Asset | Who should own it | Risk if the agency owns it | Action before notice |
|---|---|---|---|
| Search Console property | You, as verified owner | 16 months of query history lost on removal | Add a company email as owner |
| Analytics property | Your Google account | All historical data inaccessible | Take administrator on the account |
| Tag manager container | You | Tracking breaks silently at cutover | Publish an owned container |
| Domain and DNS | You, always | Existential, not just SEO | Verify registrant details today |
| CMS administrator access | You | Cannot publish or fix anything | Confirm a second admin exists |
| Business profile listing | You | Local visibility held hostage | Claim primary ownership |
| Published content | You, by assignment | Removal requests after exit | Check the IP clause |
| Rank tracking history | Practically theirs | Baseline comparison gone | Export to CSV before notice |
| Link and outreach records | You, contractually | Cannot audit or defend the profile | Request the full placement log |
Own Your Accounts: Access, Data and Portability
If you take one thing from this guide, take this: the single largest determinant of what it costs to change SEO agencies is whether the accounts were already in your name before you started thinking about it.
The nine access items to settle first
Search Console ownership, analytics administrator, tag container publish rights, CMS administrator, domain registrar login, DNS management, hosting control panel, business profile primary ownership, and any CDN or edge configuration. Nine items. Every one of them should sit on a company email address that survives an employee leaving, not on a personal account and not on an agency’s. Settle all nine and you can change SEO agencies in a fortnight rather than a quarter.
Ownership is not the same as access
An agency added as a Search Console user can be removed harmlessly. An agency that verified the property as owner is different: Search Console’s own user and owner documentation distinguishes the two, and only owners can add other owners. The same applies in analytics, where account access management puts administrator rights at the account rather than the property level. Verify which you hold before you change SEO agencies, not after.
Data you should hold a copy of regardless
Analytics and Search Console retain a limited window of history. Treat any query data older than sixteen months as something only you can preserve, and export it on a schedule. This is unglamorous and it is the difference between a defensible ninety-day review and an argument about whose fault the numbers are. Nobody has ever regretted over-exporting before they change SEO agencies.
Where the data-protection question sits
Where an agency processes personal data on your behalf — form submissions, call recordings, CRM exports — the ICO’s guidance on controllers and processors is worth reading before the relationship ends, because it governs what must be returned or deleted at termination. Put that instruction in writing rather than assuming it.
Reading the Contract Before You Change SEO Agencies
The contract decides whether you get a handover or a shrug. Read it before you make a decision, not after you have made one, because what it says may change when you can change SEO agencies at all.
The five clauses that matter
Notice period and how it is served. Whether notice can be given mid-term or only at renewal. Ownership and assignment of intellectual property in deliverables. Whether transition assistance is included, chargeable or absent. And what happens to work already paid for but not delivered.
| Clause | What it usually says | What to check | If it is missing |
|---|---|---|---|
| Notice period | Thirty days written notice | Whether email counts as written | Serve by post and email both |
| Auto-renewal | Renews twelve months unless notified | The exact window and anniversary | Diarise the date today |
| Intellectual property | Often entirely silent | That deliverables assign on payment | Request an assignment letter |
| Transition assistance | Rarely present at all | Free, chargeable or absent | Negotiate it into the final invoice |
| Prepaid undelivered work | Almost never addressed | Whether unspent budget is refundable | Ask for delivery inside the notice |
| Account ownership | Never mentioned | Who verified each account | Transfer before notice is served |
Auto-renewal is the clause that catches people
Many retainers renew for a further twelve months unless notice is given inside a window — often thirty or sixty days before the anniversary. Miss it by a week and the decision to change SEO agencies is deferred a year, or bought out. Diarise the window the day you sign, and check it now if you did not.
If the intellectual property clause is silent
Assume nothing transfers automatically. Content, technical documentation and any bespoke tooling should be assigned to you on payment, in writing. Where a contract is silent, you may hold a licence to use what you paid for without owning it, which becomes awkward the moment you want to edit or move it. A statement of work that lists deliverables and assigns them explicitly is the fix.
Settle the money cleanly
Pay what you owe, on time, and expect the same courtesy. If a final invoice is disputed, note that UK suppliers have a statutory right to interest on late commercial payments under the Late Payment of Commercial Debts rules — a withheld payment is a poor lever and an expensive one. A clean financial exit buys a cooperative handover, which is worth more than the disputed line item.
The Overlap Month: How to Change SEO Agencies Safely
The single highest-return decision available to anyone about to change SEO agencies is to pay two suppliers for one month. It feels wasteful. It is the cheapest insurance available.
Why an overlap works
It converts a gap into a handover. The outgoing team is still contractually obliged and still paid, so questions get answered. The incoming team can ask those questions while the context is live rather than reconstructing it from a spreadsheet. And critically, publishing never stops — which removes the most common cause of a transition dip entirely. Businesses that change SEO agencies with a paid overlap rarely report a dip at all.
Sequence the notice correctly
Sign the incoming agency first, with a start date that begins inside the outgoing notice period. Then serve notice. Doing it the other way round — notice first, then a procurement process — is how a thirty-day notice period becomes a ten-week gap.
Run a joint handover session, recorded
One ninety-minute call with both agencies present, screen sharing, recorded. Cover the account access transfer live, the technical backlog, work in progress, and the reasoning behind the current strategy. A recording of that call is more useful than any document either party will write, and it costs nothing.
Freeze changes for the first fortnight
Agree in writing that the incoming team makes no site-wide changes for fourteen days. They audit, they verify tracking, they read. This is not lost time; it is the control period that makes everything afterwards measurable.
| Week | Outgoing agency | Incoming agency | You |
|---|---|---|---|
| Before notice | Business as usual | Contract signed, not started | Export baselines, audit access |
| Week 1 | Notice acknowledged, work continues | Read-only access granted | Confirm account ownership |
| Week 2 | Joint handover call, WIP documented | Independent audit begins | Record the call, store the pack |
| Week 3 | Finish or formally park in-flight work | Verify tracking, no site changes | Approve the ninety-day plan |
| Week 4 | Final report, access removed last | Publishing resumes | Sign off the handover checklist |
| Week 5 onward | Relationship closed | First changes shipped, logged | Weekly check-ins for a month |
What Transfers When You Change SEO Agencies and What Does Not
Some of what your current agency built is yours. Some of it never was. Knowing which is which before you change SEO agencies prevents unpleasant surprises in week three.
Transfers cleanly, if the contract says so
Published content on your domain. Technical fixes already applied to your codebase. Documentation, audits and strategy decks you paid for. Structured data implemented on your templates, which is why a well-documented schema.org rollout is worth insisting on in editable form.
Transfers awkwardly
Rank tracking and backlink monitoring history, which usually lives inside the agency’s tool licence rather than yours. Relationships with journalists and site owners, which are personal and non-transferable. Editorial calendars built inside their project management system. Export everything you can to CSV; accept that some of it is gone.
Does not transfer at all
Agency-side automation, internal templates and any proprietary process. You are also not entitled to their staff. If a specific individual was the reason the account worked, that is a genuine argument for renegotiating rather than replacing — and a reason to be honest with yourself about what you are actually buying.
The link profile question
Backlinks earned to your pages stay pointing at your pages; they are not revocable in any normal arrangement. Rented or subscription placements are a different matter and will lapse when the invoice does. Ask directly which category your profile falls into, because the answer determines whether your rankings are durable or leased.
The Technical Handover Checklist Before You Change SEO Agencies
Five technical items decide whether the transition is invisible or obvious in your analytics. Work through all five before you change SEO agencies, because each is far harder to reconstruct once the outgoing team has gone.
Confirm tracking survives the account move
Verify conversions are still firing after ownership changes, in a real test, not by looking at a dashboard that may be reading a cached property. Broken measurement during a transition is the worst possible outcome: you lose both the performance and the ability to explain it.
Preserve the redirect map
If any URL changes are in flight, get the current mapping before the outgoing team leaves. Google’s guidance on 301 redirects is unambiguous that redirects must be maintained indefinitely, and a half-documented map is how equity quietly evaporates. Our redirect map guide covers the format to ask for.
Freeze the crawl baseline
Run a full crawl on the last day of the old relationship and the first day of the new one. Two crawls, twenty-four hours apart, is the cheapest possible proof of what did and did not change.
Check performance monitoring continuity
If page speed monitoring sat in an agency account, Core Web Vitals reporting will go dark at exactly the moment somebody starts deploying changes. Re-establish it in an owned account during the overlap.
Document the plugin and integration stack
Which plugins handle titles, sitemaps, schema and redirects, at which versions, configured by whom. This takes ten minutes to write down and saves days of archaeology.
The First 90 Days With the New Agency
A good incoming agency will propose something close to the following when you change SEO agencies. If they propose sweeping changes in week one, that is a warning sign, not enthusiasm.
Days 1 to 14: verify, do not change
Access confirmed, tracking validated, independent crawl completed, baseline agreed in writing with you. The output of this phase is a document you both sign that says “this is where we are starting from”. Without it, no future report means anything.
Days 15 to 45: fix what is unambiguous
Broken tracking, indexation errors, missing redirects, orphaned pages, obviously thin or duplicated content. These are the changes where the direction of travel is not in question. Publishing restarts here too, following the content plan agreed in the audit.
Days 46 to 90: resume the actual programme
Now the strategic work begins: the content roadmap, the technical roadmap, link acquisition, and whatever your business specifically needs. Google’s own advice on creating helpful content remains the honest description of what earns durable visibility.
Keep a change log from day one
Every site change, dated, with who made it and why. When something moves — up or down — this log is the only thing that turns a mystery into a diagnosis. It matters more in the quarter after you change SEO agencies than at any other time.
Measuring Whether the Change Worked
The honest answer arrives later than anyone wants. Set the review dates before you change SEO agencies, so that impatience does not set them for you afterwards.
The thirty-day question: did we break anything?
Not “are rankings up”. At thirty days you are checking that tracking works, indexation is stable, no redirect regressed and no traffic cliff appeared. Flat is a pass.
The ninety-day question: is the programme running?
Output restored to plan, technical backlog moving, leading indicators — impressions, average position, indexed pages — pointing the right way. Conversions may still be flat, and that is normal.
The six-month question: is it better?
Now compare against the baseline you exported before you gave notice, and against the three success numbers you wrote down. This is the point at which the decision to change SEO agencies is genuinely assessable. The GOV.UK service manual’s approach to measuring success is a sound model: agree the metrics before the work, not after the results.
Beware the attribution trap
Seasonality, algorithm updates and your own product changes all landed in the same window. A switch that coincides with a core update will look better or worse than it deserves. Compare year-on-year as well as period-on-period, and keep that change log honest.
What It Costs to Change SEO Agencies
It costs something real to change SEO agencies, and it is almost always less than the cost of not planning it. Here is the arithmetic on a £3,000 per month retainer.
The planned route
One month of overlap, paying both suppliers, costs an extra £3,000. An independent pre-exit audit costs around £1,200. Total additional outlay: £4,200, and output never stops.
The gap route
Serve notice, run procurement afterwards, and a thirty-day notice becomes a two-month gap. You pay £6,000 in notice for work that quietly tapers off, then £1,200 for the audit you should have run first. Total: £7,200 — and you also bought a two-month hole in your publishing.
The lost-access route
Now add an agency-owned analytics property removed at exit. Rebuilding tracking, re-establishing a baseline and re-creating content you could not edit adds roughly £3,600 of professional time on top of the gap route. Total: £10,800, for a switch that could have cost £4,200.
What this means in practice
The overlap costs about 39% of the worst case. Economists call the rest a switching cost, and the entire purpose of the pre-exit audit is to shrink it. For where a transition sits inside annual planning, see our SEO budget guide and the underlying UK SEO cost benchmarks.
Mistakes That Cost Rankings When You Change SEO Agencies
Every one of these is common among businesses that change SEO agencies, and every one is avoidable in an afternoon.
Serving notice before signing a replacement
The most expensive sequencing error there is. It guarantees a gap and hands all the timing leverage to a supplier who is already leaving.
Letting the new team rewrite everything in month one
Enthusiasm is not a strategy. Site-wide title, structure or content changes made before a baseline exists make the next six months unmeasurable, and some of them will simply be wrong.
Choosing the replacement on price alone
If you change SEO agencies to save £800 a month and lose a quarter of output, the saving is notional. Our SEO services and wider marketing services teams handle transitions of exactly this kind, and the pattern is consistent: the cheapest transition is the best-documented one, not the cheapest retainer.
Failing to ask the outgoing agency what they would have done next
They know things nobody else does. Asked respectfully, on a paid overlap, most will tell you honestly. Teams that change SEO agencies while treating the exit as adversarial forfeit that entirely — and it is the single most valuable free thing on the table.
Believing that tactics which looked cheap were free
If part of your visibility came from methods that sit outside Google’s spam policies, a new agency will decline to continue them, and the decline will look like a performance drop. Ask both parties directly about paid placements and link buying before you sign anything.
Frequently Asked Questions
How long should the notice period be?
Thirty days is normal and sixty is common at higher retainers, so most businesses can change SEO agencies inside two months if they sequence it properly. Longer is not automatically worse if transition assistance is included. Whatever it says, the goal is to overlap inside it rather than to wait it out.
Will rankings drop when I change SEO agencies?
Not inherently. Search engines do not see your supplier. Drops come from stopped publishing, withdrawn access, dropped work in flight or unsupervised changes. Handle those four and a switch is genuinely survivable.
How long until the new agency shows results?
Expect ninety days for the programme to be properly running and six months for a fair verdict. Anyone promising faster on a transition has not accounted for the audit phase.
Can I change SEO agencies mid-contract?
Sometimes, for cause or by agreement. Read the termination clause, take advice if the sum is material, and remember that a negotiated early exit paid in full is usually cheaper than a disputed one.
Should I tell the old agency why I am leaving?
Yes, plainly and once. A specific, unemotional reason produces better cooperation than silence, and occasionally produces a proposal good enough that you decide not to change SEO agencies after all.
Do I need an in-house owner as well?
Somebody internal has to own access, approvals and the change log. It does not have to be a full-time role, but it cannot be nobody — that is the single condition under which every plan to change SEO agencies in this guide fails.
References
Google Search Central: SEO Starter Guide
Google Search Central: Debugging Search Traffic Drops
Google Search Central: Get Started with Search Console
Search Console Help: Managing Owners, Users and Permissions
Google Analytics Help: Add, Edit and Delete Users and User Groups
Google Search Central: Redirects and Google Search
Google Search Central: Site Moves with URL Changes
Google Search Central: Creating Helpful, Reliable, People-First Content
Google Search Central: Spam Policies for Google Web Search
ICO: Controllers and Processors
Late Payment of Commercial Debts (Interest) Act 1998
GOV.UK: Late Commercial Payments, Interest and Debt Recovery
