Hiring an SEO Agency · Guide

What Is a Retained SEO Agency and How Does It Work?

There are two ways to buy this work and the industry pushes one of them partly for reasons of its own cash flow. That is stated below before the argument for ongoing work is made, so you can weigh the case knowing who is making it.

Updated: August 2026
Written by: Andrew Odgers, Managing Director
Reading time: 11 minutes
Both are legitimate

Two Ways To Buy This

An ongoing monthly arrangement with no defined end, else a specific piece of work with a scope and a finish. Both are proper ways to buy this and they suit genuinely different situations.

What a retainer is. Continuing attention.

A monthly fee for continuing work, reviewed and adjusted as things change. There is no completion point, which is uncomfortable when buying and reflects the nature of the work rather than a commercial trick.

What a project is. A defined piece of work.

An agreed scope, a price and an end. You know what you are getting and when it stops, which is a considerably easier purchase to authorise.

Why the choice is presented so rarely. Most agencies sell one.

Many firms only offer ongoing arrangements, so the question never arises in the conversation. If nobody has raised the alternative with you, that may be why.

What this page covers. The choice only.

What should be inside a monthly arrangement once you have chosen one is a separate question, covered in what should an SEO retainer include.

Stated before the argument, not after it

Why Agencies Prefer Retainers

Predictable income. It is easier to run a business on recurring revenue than on a series of projects. Every agency including this one knows it.

What that actually buys an agency. Planning.

Knowing roughly what next month brings means being able to employ people, commit to costs and turn down unsuitable work. A firm living project to project cannot do any of that comfortably.

Why you should know this before block three. It is a real motive.

The next block argues that ongoing work is usually right. That argument is made by somebody who benefits from you accepting it. You are entitled to that context before reading it rather than afterwards.

What it does not mean. That the argument is wrong.

An interested party can still be correct. The point is that you should test the reasoning rather than the sincerity, since the reasoning is checkable and the motive is simply present.

Where the motive does distort things. Two places.

Firms recommending a retainer to businesses who need a project, plus minimum terms justified by the work while actually protecting income. Both are covered further down.

What a firm without this bias sounds like. Willing to scope down.

Somebody who will propose a project, else an audit first, when that suits you better has demonstrated something the disclosure above cannot.

The case, made properly

And Why Ongoing Work Usually Is Right Anyway

Three reasons the ongoing model genuinely suits most businesses. Each is checkable rather than a matter of trust, which is what the previous block asks you to look for.

The work compounds. Earlier effort makes later effort worth more.

Each month builds on what came before, so the return accelerates rather than accumulating evenly. A project captures the early part of that curve and stops, which is the expensive portion.

Competitors do not stop. The position is relative.

Search results are a comparison rather than a score. A site left alone does not stay where it was. It stays still while others move, so the practical effect is decline without anything changing on your site.

Sites decay on their own. Quietly.

Content ages, information becomes wrong, platforms update, links break and pages that mattered stop being relevant. Somebody has to notice. A project has nobody watching after it ends.

What that adds up to. A maintenance shape.

The work resembles maintaining a position rather than completing a task. Where that description fits your situation, ongoing is the sensible answer.

Where it does not fit. The next block.

Several situations exist where a project is genuinely better. An agency that never mentions them is applying block two rather than block three.

Five situations, all common

When A Project Is The Better Answer

A defined piece of work with an end is the right purchase more often than the industry admits. Five cases where it is clearly better.

A technical fix. A specific problem with a solution.

Something identifiable is wrong and can be corrected. That is a job rather than a programme. Paying monthly for it afterwards buys nothing.

A migration. A bounded event.

Moving a site, changing platform or restructuring addresses is a project with a beginning and an end. It is also the highest risk event in this whole subject.

A one-off audit. Finding out where you stand.

An assessment producing a picture and a set of priorities. Genuinely useful alone. It has its own block below because of what it enables.

A site rebuild. Getting the foundations right.

Search input during a build is a defined contribution with a clear finish. It is far cheaper than correcting a completed build afterwards.

A business intending to take it in-house. Deliberate handover.

A project that sets things up and transfers the knowledge, so your own people continue. Perfectly reasonable to ask for. An agency treating it as an insult is telling you something.

What these share. A definable finish.

In each case somebody could say what "done" looks like. Where that sentence can be written, a project is available.

Underused, plus it costs us revenue

The Audit-Then-Decide Approach

Buy a paid audit first, with no obligation to continue. You find out what you actually need before committing to anything monthly. The cost is a fraction of a year's fees.

Why it solves the real problem. You are buying blind otherwise.

Committing to a monthly arrangement before anybody has examined your site means agreeing an amount of work without knowing how much is needed. The audit converts that guess into a decision.

What you should receive. A picture and priorities.

Where you currently stand, what is holding you back and what should happen in what order. Useful to you regardless of who does the work afterwards, including if you do it yourself.

Why no obligation matters. It changes the incentive.

An audit sold as a route into a retainer will tend to find a retainer's worth of problems. One sold as a standalone piece has no such pull. You should ask which you are being offered.

What it tells you about the agency. Willingness alone.

A firm happy to do this is content for you to make an informed decision, including one that goes against them. A firm unwilling is worth asking why. The answer is usually about their pipeline.

What to do with the findings. Three options.

Engage them, engage somebody else with a clear brief, else do it yourself. All three are better positions than committing before knowing anything.

The warning

What A Retainer Should Not Be

A fixed monthly package of identical deliverables regardless of what the site needs is a subscription rather than a service. The work should change as the situation does.

How to recognise it. Fixed quantities.

A stated number of the same items each month, set before anybody examined your site. The giveaway is that the quantities are in the proposal rather than arising from what was found.

Why it is sold that way. It is easy to price and deliver.

Identical packages are simple to quote, resource and repeat across clients. That is efficient for the seller and it means the shape of the work was decided by their operations rather than by your situation.

What is wrong with it. Needs change and it does not.

What a site requires in month one and month twelve are different. A package delivering the same things throughout is either doing unnecessary work later or insufficient work early, usually both.

What a proper retainer looks like. Capacity, directed.

An agreed amount of time and attention, applied to whatever currently matters most. That is harder to describe in a proposal and it is what you actually want.

How to test it. Ask what would change.

Ask what would be different in month eight if the technical work were finished. A firm with a real retainer redirects the effort. One with a package explains that the deliverables are the deliverables.

Answered, without a period attached

Stopping And Starting

Businesses want to know what actually happens if they pause. The answer is that nothing collapses immediately, things decay gradually, then restarting costs more than continuing would have.

What does not happen. An immediate fall.

Stopping does not remove what was built. Pages remain, the work already done still counts and nothing is switched off. Agencies implying otherwise are describing a mechanism that does not exist.

What does happen. Relative decline.

Competitors continue, content ages and the site stops adapting. The position erodes rather than crashing, which is why businesses frequently pause, see no immediate harm and conclude the work was unnecessary.

Why that conclusion is wrong. The lag disguises it.

The consequences of stopping arrive well after the saving, so the cause and the effect are separated by enough time that nobody connects them. That is the single most misleading feature of this work.

What restarting costs. More than resuming.

A new arrangement means learning the account again, re-establishing what was in progress and recovering ground lost meanwhile. None of that is free and none of it produces anything new.

What to do if money is tight. Reduce rather than stop.

A smaller ongoing arrangement keeps continuity and the accumulated knowledge. That is nearly always better than stopping entirely and returning later.

The same either way

What Should Be In The Agreement Either Way

Whichever model you choose, the terms should protect the same things. Those are set out properly elsewhere rather than repeated here.

The contract terms. Ownership, exit and what is promised.

Who owns the website, what happens at the end and whether the agreement describes work rather than outcomes. What is a typical SEO agency contract covers all of it, including the four things we commit to.

What a monthly arrangement should contain. Its own question.

Once you have chosen ongoing work, what should actually be inside it is covered in what should an SEO retainer include.

How long to commit. The tension worth understanding.

The work needs time and that is also the argument used to justify terms serving the agency. How long should you commit holds both of those at once.

What applies to a project specifically. A finish.

A project agreement should say what completion means and what you receive at the end, since a project without a definition of done becomes a retainer by accident.

Why these matter equally. Nothing about the model changes them.

A project does not remove the ownership question or the handover question. The full series is on the hiring an SEO agency guide.

Website migrations

Buy the audit
before you buy
the year.

We will assess where you stand with no obligation to continue. The findings are yours whether you engage us, engage somebody else or do the work yourself. If a defined project suits you better than anything monthly, we will say so.

What we commit to in writing:

No setup charge No protective tie-in You own the website Updates every three weeks Work you can inspect Reporting you can question Accounts in your name Handover if you leave

Our prices are published rather than quoted on request, so you can compare us against anybody else before speaking to us.

The full guide series

Every guide.
One practice.

What an agency is, whether to buy at all, which model suits you, how to vet one, what things cost, what should be in a contract and how to work with them afterwards.

Questions people ask

Retainers and Projects, Briefly

Why does every agency want a monthly retainer?
Predictable income. Every agency including this one knows it. Recurring revenue means being able to employ people, commit to costs and turn down unsuitable work, which a firm living project to project cannot do comfortably. That is a real motive and it does not make the argument for ongoing work wrong. Test the reasoning rather than the sincerity.
Can we just pay for a one-off piece of work?
Often yes, more often than the industry admits. A technical fix, a migration, a one-off audit, search input during a site rebuild or a deliberate handover so you can take it in-house are all genuine projects. What they share is a definable finish: if somebody can say what done looks like, a project is available.
How do we decide without committing to a year first?
Buy a paid audit with no obligation to continue. Committing monthly before anybody has examined your site means agreeing an amount of work without knowing how much is needed. Ask whether the audit is sold as a route into a retainer or as a standalone piece, since the first will tend to find a retainer's worth of problems.
Our monthly package is the same every month. Is that normal?
Common. It is a subscription rather than a service. A site needs different things in month one and month twelve, so a package delivering identical items throughout is doing unnecessary work later or insufficient work early, usually both. Ask what would be different in month eight if the technical work were finished.
What happens if we stop for a few months?
Nothing collapses immediately. Pages remain and the work already done still counts, so anybody implying an instant fall is describing a mechanism that does not exist. What happens is gradual relative decline as competitors continue and content ages. The consequences arrive well after the saving, so businesses pause, see no immediate harm and draw the wrong conclusion.
Money is tight. Should we pause?
Reduce rather than stop, if you can. A smaller ongoing arrangement keeps continuity and the accumulated knowledge of your account. Restarting later means learning the account again, re-establishing what was in progress and recovering ground lost meanwhile, none of which produces anything new.