What Is an SEO Agency: Everything You Need to Know

An SEO agency is a business that can help your company improve its online visibility by offering a variety of SEO services and industry expertise. If you’re a business unsure if hiring an SEO agency is right for you, then you might be wondering what they actually do, what the benefits of working with an agency are, and how to spot a reputable provider. 

Let’s take a closer look at everything you need to know about working with an SEO agency.

What is an SEO agency?

Online visibility is essential for UK businesses of all sizes. But with fierce competition across every industry, standing out and driving consistent organic traffic isn’t easy. To grow effectively, you’ll need someone in your corner, someone who can craft a smart SEO strategy, conduct SEO campaigns that get results and ultimately, help your website climb the search engine results pages. And this is the role of an SEO agency.

What does an SEO agency do?

When hiring an SEO agency, it’s easy to think that all they’ll focus on is improving search engine rankings and online visibility, but in truth, the role of an SEO agency goes far beyond getting you onto page one of Google (and if that’s all they’re offering, then you need to look elsewhere). The best SEO companies offer strategy, expertise, and ongoing support to help your business grow online, and not just with a quick fix, quick results approach, but in a sustainable way that can shift and adapt with ease to the changing needs of your business.

Whether you’re new to search engine optimisation and SEO strategy or you’re looking to build on your existing efforts, the right SEO agency will work hard behind the scenes to make sure your website and online visibility are as strong as possible. Here’s a snapshot of how they might do this.

Keyword research & strategy

As part of an effective SEO strategy, an agency will take the time to research and understand how your audience searches online. They’ll do this by identifying specific search terms and phrases that your target audience uses when looking for products or services like yours.

This kind of keyword research is usually standard practice when hiring an SEO agency, but it’s more than just finding popular keywords and trying to rank for them; it’s about looking closely at keyword rankings and search volume, and aligning these with your specific goals and the user intent. From here, an SEO agency will develop a tailored SEO strategy to target those keywords and drive the right visitors to your site.

On-page SEO optimisation

On-page SEO involves making sure that each page of your website is fully optimised in a way that is user and search engine results-friendly. The goal here is to help search engines understand your content and consider it to be of high value, as well as to improve the user experience for your website visitors. An SEO agency will be on the lookout to fine-tune a range of website elements such as meta descriptions, meta titles, image tags, headers, and content structure to ensure that everything is aligned with current best practices. This will help with your website’s organic search rankings.

Technical SEO

An SEO agency will know that every website needs a solid technical SEO foundation, and this includes aspects of your site structure that help search engines to crawl, index, and understand your content. Your SEO agency will carry out a detailed SEO audit to help identify and fix any technical issues that might be holding your website back. This often means taking a closer look at site speed, mobile-friendliness, URL structure, crawl errors, and XML sitemaps.

Content strategy & creation

A good content strategy is like the beating heart of any SEO strategy. And a good SEO agency should recognise the importance of developing one that targets the right keywords whilst speaking directly to your audience’s needs and interests, all while aligning with your business goals.

Content strategy and creation take various forms, but they could involve optimising your existing pages or creating fresh blog posts, guides, or landing pages. Regardless of what form it takes, the goal here is to provide valuable, engaging content that drives traffic and encourages action. The right SEO agency should also recognise it’s not just about quantity but about developing high-quality content that helps you build trust with your audience, showcases your expertise, and supports your search engine visibility in the long term.

Link building

High-quality, relevant links from other reputable sources act like a vote of confidence in your content. And search engines take notice! A link-building strategy is the process of earning these backlinks to boost your site’s authority, which in turn, will improve your rankings.

Your SEO agency can develop a link-building strategy in a range of ways, securing links that genuinely add value and signal trust to search engines through strategies such as digital PR, guest posting, and content outreach.

Local SEO

A local SEO strategy is essential for any business that serves a specific area or has a physical location. Appearing in local searches when potential customers are looking for services “near me” or in a particular town or region is key to your online success.

To help you boost your performance in location-based searches, an SEO agency can help optimise your Google Business Profile and ensure your website includes relevant information that will help search engines to recognise the area and locations you serve. This could mean NAP consistency across your website and local directories, embedding you in Google Maps and including location-specific keywords on your website, such as “plumber in Manchester” or “Dog groomers in Leeds”.

SEO audits & competitor analysis

Do you know how well your website is currently performing? Or how it compares to your closest competitors? Before looking at improving search engine rankings and boosting your organic traffic levels, SEO companies will offer a detailed audit of your site, identifying technical issues, content gaps, and missed opportunities for search engine optimization.

Alongside this they’ll also take a closer look at what’s working for your competitors, analysing their keyword targeting and backlink strategies. Once armed with these detailed insights, they’ll be able to create a data-driven SEO strategy that’s fully tailored to your business and your needs.

Analytics & reporting

Any SEO agency can promise the world, but all SEO strategies must go hand in hand with detailed analytics and thorough reporting. It’s from information and data gathered from SEO tools like Google Analytics and Google Search Console that your SEO team can measure how well your website is performing, where improvements can be made and where your investment is delivering.

Clear, transparent data that highlights everything from traffic volumes to keyword rankings, user behaviour and conversions helps you and your SEO agency make smarter decisions, highlights what’s working and what’s not and ensures the SEO strategy stays aligned with your business goals.

Top benefits of working with an SEO agency

Partnering with an experienced SEO company comes with a whole host of benefits. Search engine optimisation is an ongoing process, and one that can quickly become overwhelming and complicated, hiring an SEO agency to do all the heavy lifting simply makes sense.

Let’s explore some of the benefits and why working with an SEO agency can be a smart investment for your long-term digital growth.

Expertise & experience

For those unfamiliar with SEO services and search engine algorithms, SEO campaigns can be complicated and difficult to manage. This is why one of the biggest benefits of hiring an SEO agency is having full access to a team of specialists who have a real passion for digital marketing and SEO success. From content creation to local SEO, on page optimisation and link building, they’ll bring years of experience across different industries and platforms to your business, taking the guesswork out of digital marketing.

Ultimately, it’s this level of expertise that SEO agencies offer that helps you avoid all those common pitfalls and gets you results faster and more efficiently.

Scalable solutions

To develop a successful SEO strategy, a good SEO agency will understand that all businesses are different. Maybe you’re a small start-up looking to tap into local SEO, or you’re a well-established company that’s outgrown its in-house SEO team and needs more support. Hiring an SEO agency means that they can tailor their services to match your current goals and grow with you over time.

Services can be tailored or scaled depending on your needs and current budget, and it’s this flexibility that means you can continue to grow digitally, without overstretching your budget.

Access to premium tools

SEO is data-heavy, from keyword research to backlink analysis, to SEO audits and performance tracking. Reputable SEO firms will always invest in premium SEO tools like SEMrush, Ahrefs, Screaming Frog, and others to gain deep insights that would be costly or complex for most businesses to manage in-house.

When you opt to work with an SEO agency, you’ll benefit from the power that all these tools can bring to your latest campaigns, along with all the expertise and know-how that’s needed to interpret the data and turn it into action.

Time & resource efficiency

Developing, monitoring, and adapting any digital marketing strategy takes time, consistency, and a huge amount of attention to detail. For many businesses, especially those that are just starting out or companies with smaller in-house SEO teams, managing their digital marketing efforts effectively can stretch their resources a little too thinly, which in turn can leave their SEO strategies floundering.

Partnering with an SEO agency means that you can focus on running your business while letting the experts handle and manage your growing online presence. It’s a more efficient use of your time and ensures that SEO tasks aren’t pushed aside or rushed, which ultimately means better results.

Adapting to AI overviews & LLM-driven search

The digital landscape is always changing, and one of the biggest shifts is the rise of AI-generated results such as Google’s AI Overviews and search tools powered by large language models (LLMs). 13.14% of queries triggered AI Overviews in March 2025, more than double the number in January 2025.

Instead of simply listing websites, search engines are beginning to deliver direct, summarised answers. This can have a major impact on how people find and interact with your business online.

For many companies, keeping up with these changes and understanding how to optimise for them can be overwhelming. An SEO agency can take this pressure off by monitoring how AI-driven results are evolving and refining your content strategy so that it remains competitive. This includes creating clear, authoritative content, structuring it in a way that AI tools can easily interpret, and strengthening your brand’s credibility with E-E-A-T signals.

What to look for in an SEO agency

With so many SEO companies out there, it can be difficult to know where to turn. Choosing the right SEO agency can make or break your online success, but it’s not always easy to know who to trust, especially with so many firms promising the best results.

Ultimately, any reputable SEO agency will feel more like a partner and not just like a service provider. Let’s take a closer look at SEO agency hiring tips and some key factors to consider so you can make an informed decision that aligns with your business goals, needs, and budget.

Proven track record and case studies

Top SEO companies are built on trust, and any trustworthy SEO agency will be able to demonstrate and happily share real results. When looking for the right agency, make seeking out client testimonials, case studies, and examples of their previous successes a priority.

This should give you confidence in their abilities as an SEO services provider and that they have a proven track record of adapting strategies to different industries to achieve SEO success.

Transparent processes and reporting

From content creation and link building to technical SEO and effective keyword research, when you’re working with an SEO company, you should always know what’s being done, why it matters and what the results are. Any reputable agency will always prioritise transparency with their clients and demonstrate this through regular updates and clear reports that you can understand.

They should happily explain metrics and the performance of your strategies in real time, in plain English and also be upfront about what’s working, what’s not, and where improvements or a change of direction could be needed. This is the simplest and most effective way to build trust and ensure you’re working well together.

Realistic expectations

Reputable SEO companies know that SEO is not a quick fix. It involves the development of multiple strategies over the long term, and it takes time to deliver the sustainable results you need. If your chosen agency is realistic, is honest about how long these things take and manages your expectations from the beginning about what can be achieved and when, then take this as a green flag.

Always be wary of SEO agencies that offer numerous SEO tactics without any real strategy, or those who promise amazing overnight rankings or guaranteed top spots on the first page of Google. A genuine partner will focus on steady growth and long-term success, not quick wins or shortcuts.

Alignment with your business goals

When it comes to SEO, there’s no “one-size-fits-all” approach, and a reputable SEO agency will invest time and resources into learning as much as they can about your business, your industry, and what your goals are.

From here, their SEO efforts should always be tailored to suit your specific needs and what matters most to you. When an agency aligns closely with your vision, you’re far more likely to see meaningful, measurable results that move your business forward.

Have a discovery call

Finding out if an SEO firm is right for you starts with a discovery call. This initial conversation should be used as an opportunity for you to ask questions and explain your goals, all whilst getting a feel for how you and this agency might work together.

For them, it’s a chance to assess whether they’re the right fit for you. They might offer insights, outline how they can help you achieve your goals and showcase their previous successes. All this should be done without you feeling any pressure to commit or make a financial decision.

Red flags to avoid

There are many reputable SEO providers out there, but it’s important to be aware of the warning signs that might indicate that an agency isn’t as trustworthy or effective as they claim. Let’s take a closer look.

Guaranteed results

Always be wary of agencies promising SEO services that guarantee top positions on Google. As SEO is influenced by a variety of factors that can’t be fully controlled, such as algorithms and user behaviour, no SEO agency should guarantee specific results. Remember, unrealistic promises could mean the use of risky tactics that could be doing your online presence more harm than good!

Lack of transparency

SEO firms that hide results, refuse to share regular reports, or how they’re achieving results should be approached with caution. Any reputable provider will always be open about their processes, provide clear updates, and explain their actions in a way that makes sense to you. If you’re left in the dark or constantly chasing answers, it may be a sign they’re not confident in their work!

Black-hat tactics

SEO best practices should always be ethical and never manipulated to get results. When SEO agencies use questionable techniques such as keyword stuffing, hidden text, or link schemes to deliver quick wins, your website could be penalised and even removed from search results entirely, causing serious damage to your online presence.

Remember, a trustworthy SEO agency will always focus on sustainable strategies that will build long-term success; they’ll never risk your business reputation or online presence to hit targets or meet deadlines.

Final thoughts

Working with the right SEO agency can be a real game-changer for your business, helping you grow your online presence and attract the right audience. By asking the question: What is an SEO agency? Understanding what an agency does, what to look for, and what to avoid, you’re in a strong position to make a confident, informed choice.

FAQs

How long does it take to see results from SEO?

It can typically take between 3-6 months to start seeing noticeable results; however, this will vary depending on your industry, competition, and the current state of your website.

Is SEO better handled in-house or outsourced to an agency?

If you have the skilled staff, time, and resources, then you may prefer to stick with your in-house team. However, if you want specialised knowledge, advanced tools, and scalability, consider reaching out to an SEO firm.

Can an SEO agency guarantee rankings?

No. A reputable agency will never guarantee specific rankings. This is due to factors that are outside their control. Businesses should always be wary of agencies that make sensational claims about their results.

How much does an SEO agency cost?

Costs can vary widely, and they depend on factors like your goals, industry and the services you need. Often, SEO agencies offer monthly packages which will vary between providers.

Do small businesses need SEO agencies?

Yes. Especially if they don’t have an in-house digital marketing team. Even if your budget is limited, SEO agencies can always help to improve your online visibility.

How do I measure success with my SEO agency?

Your SEO agency should regularly share and discuss key metrics that measure success. These include organic traffic, keyword rankings, leads, and conversions.

Can an SEO agency help me recover from a Google penalty?

Yes. An experienced SEO agency can identify the cause of a penalty and help your site recover over time. 

Can an SEO agency help with AI Overviews and AI-driven search? 

Yes. SEO agencies can adapt your strategy for AI-generated results by optimising your content to be more aligned with how large language models process information. This helps improve your chances of appearing in AI Overviews and other AI-powered search results.