How to Choose an SEO Agency

Hiring an SEO agency can be one of the most valuable marketing decisions your business makes. The right agency can become a long-term growth partner, helping you generate more qualified traffic, leads and revenue. The wrong one can consume budget, waste valuable time and leave you questioning whether SEO works at all.

The challenge is that choosing an SEO agency isn’t straightforward. Most businesses don’t hire SEO specialists very often, making it difficult to know what good looks like. Every agency promises expertise, and every proposal sounds convincing – comparing different approaches can quickly become overwhelming.

This guide explains what to look for when hiring an SEO agency, the questions you should ask before signing a contract and the common mistakes that businesses make during the selection process. Whether you’re currently comparing multiple agencies or considering SEO for the first time, our goal is to help you make a confident and informed decision.

Is Your Business Ready to Hire an SEO Agency?

Before comparing agencies, it’s worth taking a step back and asking a simple question: is your business actually ready to invest in SEO?

SEO can be one of the most effective long term marketing channels available, and it must be seen as an investment, not a quick-fix. Unlike paid advertising (PPC, Meta Ads), where visibility stops as soon as the budget runs out, organic search has the potential to deliver consistent traffic and enquiries over time. However, that doesn’t mean it’s the right investment for every business at every stage and it’s important to think about this honestly.

A good example would be a newly launched business with no established website, limited marketing budget or an untested product. They may benefit more from validating demand first before investing heavily in organic growth. Equally, businesses that rely almost entirely on referrals may find that SEO plays a supporting role rather than becoming a primary source of new business. Agencies themselves are a good example of the latter.

Instead, if we take businesses that already have a functioning website and are looking for sustainable growth, they are often much better positioned to benefit from SEO. This is particularly true where customers actively use search engines to research products, services or suppliers before making a purchasing decision.

It’s also worth remembering that hiring an agency isn’t your only option. Depending on your business, budget and internal capabilities, you may decide that working with a freelancer or building an in-house SEO function is more appropriate. The right choice depends on your objectives, available resources and the level of expertise you need.

The important point is this: don’t hire an SEO agency simply because competitors are investing in SEO or because you’ve received an impressive proposal. Start by understanding your own goals, then look for the solution that best supports them. If you’re still weighing up the timing, our guide on when to hire an SEO agency sets out the practical signals worth checking for before you start approaching anyone. Once you are ready, writing those goals into a short brief before you contact agencies makes the proposals you get back far easier to judge, and our guide to writing an SEO brief that gets you comparable proposals covers what to include.

What Does a Good SEO Agency Look Like?

No two SEO agencies are the same. Some specialise in technical SEO, others focus on content, digital PR or international growth. The services they offer may differ, but the qualities of a good agency are remarkably consistent.

Rather than focusing solely on what an agency says it will do, pay attention to how it approaches your business. A strong SEO partner should be transparent, commercially aware and able to explain their recommendations in a way that makes sense to you.

Characteristics of a Good SEO Agency

A good SEO agency…	Be cautious if they…
Takes time to understand your business and objectives	Starts recommending solutions before understanding your business
Explains its strategy in plain English	Relies heavily on jargon or vague explanations
Sets realistic expectations and timelines	Promises guaranteed rankings or instant results
Measures success against business outcomes	Focuses only on rankings or traffic
Clearly explains deliverables and reporting	Is unclear about what you’ll actually receive
Is honest about challenges and limitations	Avoids difficult conversations or overpromises

While no agency will tick every box perfectly, the overall approach should leave you feeling informed and confident rather than confused or pressured.

What should you be looking for?

As you begin comparing agencies, keep these principles in mind:

• Commercial understanding – They take the time to understand your business model, customers and objectives before recommending a strategy.
• Transparency – They clearly explain what they’ll do, why they’re recommending it and how success will be measured.
• Clear communication – You feel comfortable asking questions and receive straightforward answers rather than technical jargon.
• Relevant experience – They can demonstrate experience solving problems similar to yours, even if they haven’t worked in your exact industry.
• Realistic expectations – They explain that SEO is a long term investment and avoid making promises they can’t guarantee.
• A collaborative approach – They see themselves as an extension of your business rather than simply another supplier.

One of the first things I look for from an agency is a working knowledge of the industry — can they naturally reference examples of strategies that worked in similar environments? That’s a genuine signal of experience. It’s not something that can be contrived or lifted from a standard sales pitch.

Andy McLoughlin, Founder of Before You Invest

Remember, the right SEO agency isn’t necessarily the biggest, the cheapest or the one with the most polished sales presentation. It’s the agency whose approach, expertise and communication style best align with your business and long term objectives.

In the next section, we’ll look at how to compare SEO agencies more objectively, so you can move beyond marketing claims and evaluate proposals with greater confidence.

How to Compare SEO Agencies

Once you’ve shortlisted two or three agencies, the challenge changes. You’re no longer deciding whether SEO is the right investment, you’re deciding which agency is best placed to help you achieve your goals.

At this stage, it’s easy to compare headline figures such as monthly cost or contract length. While these are important considerations, they rarely tell the full story. Two proposals with similar pricing can vary significantly in terms of strategy, deliverables and long term value.

Instead of asking “Which agency is cheapest?”, ask yourself “Which agency has made the strongest case for solving our business challenges?”

Compare the strategy, not just the services

Every agency should be able to explain how they intend to improve your organic visibility. More importantly, they should explain why they have recommended that approach.

Look for evidence that the strategy has been tailored to your business rather than copied from a standard template.

Ask yourself:

• Does the proposal demonstrate an understanding of our business and objectives?
• Are the recommendations specific to our website and market?
• Can we clearly understand why these activities have been prioritised?

The biggest giveaway that a proposal has been rushed out or copied and pasted is the lack of any reference back to the brief. A lot of the activity in a proposal can be generic, but there always needs to be specific goals that the strategy circles back to.

Andy McLoughlin, Founder of Before You Invest

Compare deliverables

SEO proposals often include similar sounding services, but the level of detail can vary considerably.

Rather than simply checking whether two agencies both offer technical SEO or content optimisation, compare exactly what is included, how often work will be delivered and what outcomes those activities are intended to achieve.

A proposal should leave you with a clear understanding of:

• What work will be carried out.
• How frequently work will be delivered.
• Who is responsible for each activity.
• What success looks like over time.

Compare reporting and accountability

A good reporting framework should help you understand whether your investment is delivering value. Look beyond rankings alone.

Consider whether the agency explains:

• Which KPIs will be tracked.
• How often reports will be shared.
• How performance will be reviewed.
• What happens if priorities change during the engagement.

Regular reporting should create transparency, not simply provide large amounts of data.

Compare commercial fit

The best SEO agency isn’t always the one with the largest team or the highest profile. Consider how well each proposal aligns with your business.

Think about:

• Your available budget.
• The level of support you need.
• Internal resource available to implement recommendations.
• Expected timelines.
• Whether the proposed engagement feels proportionate to your objectives.

An ambitious strategy can be appealing, but only if it’s realistic for your business to deliver.

Compare the relationship, not just the proposal

Finally, remember that you’re choosing a long term partner rather than purchasing a one off service. Ask yourself:

• Do you trust the people you’ll be working with?
• Have they answered your questions openly?
• Do they communicate clearly?
• Have they been honest about potential challenges as well as opportunities?

Technical expertise is important, but a successful SEO partnership also depends on trust, collaboration and clear communication.

A simple comparison framework

Area	Questions to Consider
Strategy	Does the approach feel tailored to our business?
Deliverables	Do we understand exactly what we’ll receive?
Reporting	Will we be able to measure progress clearly?
Commercial Fit	Does the proposal align with our budget and objectives?
Relationship	Do we trust this team to become a long term partner?

If you’re struggling to separate two seemingly similar proposals, an independent review can provide valuable clarity. A fresh perspective can highlight strengths, identify gaps and help you make a more confident decision before signing a contract. If you’d rather build this out yourself first, our guide on how to compare SEO agency proposals side-by-side walks through a version of this framework in more detail.

Understanding SEO Proposals

By the time you’ve spoken to a few agencies, you’ll probably have one or more SEO proposals sitting in your inbox. At first glance, they can appear remarkably similar. They often include comparable services, similar pricing structures and familiar marketing language, making it difficult to identify which proposal genuinely represents the strongest opportunity.

The reality is that no two SEO proposals are exactly alike. Agencies vary in how they define their services, prioritise activity and present their recommendations. Some proposals are highly detailed and tailored to your business, while others follow a more generic template.

A well-written proposal should help you understand not only what an agency plans to do, but also why they’ve recommended that approach and how it supports your business objectives.

A strong SEO proposal should clearly explain:

• Your current position and the opportunities identified.
• The proposed strategy and why it has been recommended.
• The scope of work and expected deliverables.
• How success will be measured.
• Project timelines and reporting.
• Commercial terms, assumptions and any limitations.

Remember, a proposal isn’t simply a pricing document. It’s an opportunity for an agency to demonstrate its understanding of your business and the thinking behind its recommendations.

When comparing proposals, don’t assume that similar pricing means similar value. Two agencies may charge the same monthly fee while recommending completely different levels of activity, different strategic priorities or different measures of success.

It is also worth reading a proposal twice: once for the strategy, and once for what it deliberately does not say. Agencies rarely misrepresent their work outright, but they do write around weak spots — no mention of reporting cadence, no named point of contact, no explanation of what happens if targets are missed. Our SEO proposal red flags checklist walks through the specific omissions and phrases worth watching for.

If you find yourself comparing multiple proposals side by side and struggling to identify the key differences, you’re not alone. It’s one of the most common challenges businesses face when hiring an SEO agency.

If you would like to structure that comparison yourself, our free SEO proposal comparison tool lets you enter the terms of one or two proposals and returns an instant Confidence Score, red-flag check and plain-English verdict.

If you’d prefer an independent opinion, our SEO Proposal Review service provides an impartial assessment of your proposal, highlighting strengths, identifying potential gaps and helping you understand whether the recommended approach is right for your business before you sign.

Common Mistakes When Choosing an SEO Agency

Hiring an SEO agency is rarely a decision businesses make frequently. Without a clear framework for comparing providers, it’s easy to focus on the wrong factors or overlook important details that only become apparent once the work has started.

While every situation is different, there are a handful of common mistakes that appear time and time again.

Choosing based on price alone

Budget will always play an important role, but it shouldn’t be the deciding factor. The cheapest proposal may exclude key deliverables, while the most expensive isn’t automatically the best option. Instead of comparing monthly fees in isolation, consider the overall value being offered and whether the proposed approach is appropriate for your business.

A textbook example of agency regret is going with the cheapest option. Many of the clients I work with are rebounding from a poor experience with another agency, and it usually comes down to price. The outcome is normally a lack of transparency and a spammy backlink profile, with the only tangible output being a blog. It’s common in this industry because of how SEO gets labelled — ‘dark arts’, ‘black magic’ — when really, a good agency should be able to manage expectations from day one.

Andy McLoughlin, Founder of Before You Invest

If you’re not sure what fair value actually looks like, our guide to how much SEO should cost explains the pricing models agencies use and what typically drives the difference between a cheap and an expensive proposal.

Focusing on promises instead of evidence

It’s easy to be persuaded by ambitious growth forecasts or confident sales presentations. Instead, ask for evidence that supports an agency’s recommendations — relevant experience, a clearly explained strategy and realistic expectations are often far more valuable than bold claims that can’t be substantiated. This applies just as much to newer claims about AI visibility or GEO work — see our guide on spotting a genuine AI-visibility claim versus a buzzword before taking one at face value.

Comparing proposals like for like

Two proposals may recommend completely different strategies, deliverables and levels of support, even if they cost a similar amount. Without taking the time to understand what’s actually included, it’s easy to compare agencies unfairly or miss important differences that could affect long term results. Running each proposal against our SEO proposal red flags checklist is a quick way to spot the gaps before you compare on price alone.

Not defining success before signing

Before appointing an agency, make sure everyone agrees on what success looks like. For one business, success may mean generating more enquiries; for another, it could be increasing ecommerce revenue, improving visibility in a particular market or supporting a wider growth strategy. Having clear objectives from the outset makes it much easier to evaluate both proposals and future performance.

Rushing the decision

Businesses often spend weeks researching agencies, only to make a final decision based on instinct or a deadline. Taking a little extra time to review proposals, ask questions and compare different approaches can provide valuable reassurance before committing to a long term partnership.

Avoiding these mistakes doesn’t guarantee success, but it can significantly improve your chances of finding an agency that’s the right fit for your business. The more informed your decision, the more likely you are to build a productive relationship that delivers value over the long term.

Should You Get a Second Opinion Before You Sign?

Most business owners hire an SEO agency once every few years, if that. Which means the one time it really matters, you are doing it without much practice — and usually while the agency across the table does this every week. That imbalance is the strongest argument for a second opinion.

A second opinion is not about distrust. It is the same instinct that leads people to have a surveyor check a house before they buy it, even when the estate agent seems perfectly reasonable. The agent is not necessarily wrong — but they are not the one who has to live with the outcome, and neither is the agency writing your proposal.

Timing matters more than most people expect. An independent review is most useful before you sign, not after. Once a contract is running, a review can tell you whether the work is landing — but it cannot undo a scope that was wrong from the outset, or a twelve-month lock-in you did not need to accept. Reviewing a proposal takes a few days. Unwinding a bad one can take a year.

As a rough rule: if you are committing more than a few hundred pounds a month, or signing for longer than three months, the cost of an independent review is usually a small fraction of a single month of the retainer it is checking.

Making Your Final Decision

By now, you should have a clearer understanding of what to look for in an SEO agency, how to compare different providers and the common mistakes to avoid during the hiring process.

The final decision, however, isn’t always straightforward. It’s common to receive two or three strong proposals that all appear capable of delivering results — similar pricing, comparable case studies and well-presented strategies, making it difficult to separate genuine value from a polished sales process.

At this stage, confidence often comes from asking the right questions rather than making a quick decision. Take the time to revisit each proposal, clarify anything that isn’t clear and make sure the recommended approach genuinely aligns with your business objectives, budget and expectations.

If you’re still unsure, an independent review can provide valuable reassurance before you commit. At Before You Invest, our SEO Proposal Review service helps businesses make more informed hiring decisions — rather than recommending one agency over another, we independently assess your proposal, explain what it includes, and highlight potential strengths or gaps that could influence your decision.

Whether you’re comparing multiple agencies or simply want a second opinion before signing a contract, our goal is to help you move forward with confidence.

Before you appoint an SEO agency, ask yourself:

• Do we fully understand what’s being proposed?
• Can we clearly explain why we’ve chosen this agency over the alternatives?
• Are we confident the strategy aligns with our business objectives?
• Do we understand what success will look like over the coming months?
• Have we challenged any assumptions or asked for clarification where needed?

If the answer to any of these questions is no, it’s worth taking one final look before making your decision.

If you want to see this kind of due diligence applied at scale, our data investigation into what UK councils actually pay for SEO and digital marketing is worth a read. Real invoices, real agencies, checked line by line against nearly 900,000 public payment records.

Once you’ve narrowed things down to a shortlist, the real test comes when the proposals land. Our independent SEO Proposal Review checks what each agency is actually offering against market norms, so you’re comparing substance rather than sales pitches.

Frequently Asked Questions

Should I get a second opinion before signing an SEO contract?

If you are spending more than a few hundred pounds a month, or signing a contract longer than three months, then yes. An independent review typically costs far less than a single month of the retainer it is checking, and it is the only point at which the terms are still negotiable. For a quick sense check of what that retainer should be, our free SEO cost calculator gives you an estimated monthly range for your business.

What counts as a red flag in an SEO proposal?

Guaranteed rankings, vague deliverables with no timeline, reporting that covers only rankings and traffic rather than leads or revenue, and pricing that is not tied to a defined scope of work. Our full red flags checklist covers the complete list.

Do I need more than one proposal to make a good decision?

It helps, but it is not essential. A single proposal can still be assessed against what a strong proposal should contain — scope, strategy, measurement and commercial terms — even without a second one to compare it against.

Can I get a proposal reviewed if I have not chosen an agency yet?

Yes. An SEO Proposal Review works whether you are deciding between two agencies or sense-checking a single offer before you commit.

How long should an SEO contract be?

There is no single right answer, but be cautious about long lock-ins early in a relationship. SEO does take months to compound, so a very short term can be counterproductive — the question to ask is whether the length of the commitment is matched by a clear, staged plan and defined review points.

This guide assumes SEO specifically is the right fit. If you’re still deciding between SEO, PPC, web design or another type of agency altogether, our wider guide to choosing a digital marketing agency covers that decision first.