Choosing an SEO agency in London isn’t always straightforward. There are hundreds to choose from, ranging from independent consultants to large, full-service agencies, and many claim to be the best.
The reality is that the right agency depends on your business, your sector and your goals. The best choice for a Harley Street clinic is unlikely to be the same as the best choice for a Shoreditch fashion brand or a fintech business in Canary Wharf.
In this guide, we’ve reviewed ten of the strongest SEO agencies operating in London in 2026 and explained what each one is best suited to, so you can decide which is the right fit for your business.
As this is Figment Agency’s guide, we’ve included ourselves in the rankings. We’ve also explained the criteria behind our choices, so you can make your own informed decision.
What does an SEO agency in London actually do?
Before comparing agencies, it helps to know what modern SEO covers. A good London SEO agency in 2026 works across several disciplines, and the best ones join them up rather than selling them in silos:
- Technical SEO — site speed and Core Web Vitals, crawl-ability, indexation, site architecture, structured data (schema), and mobile-first performance.
- On-page SEO — keyword research, search intent mapping, page titles, meta descriptions, headings, and internal linking.
- Content marketing — topic clusters, pillar pages, and the kind of genuinely useful content that earns rankings and citations.
- Digital PR & link building — earning authoritative backlinks and brand mentions from publications and high-authority domains.
- Local SEO — Google Business Profile optimisation, Google Maps and Local Pack visibility, citations and reviews — vital for clinics, shops and service businesses with a physical London presence.
- Generative Engine Optimisation (GEO) / AI search — the newest and fastest-growing discipline: getting your brand found and recommended by ChatGPT, Google’s AI Overviews, Gemini, Perplexity and Claude. (We explain this in depth in our guide to LLM optimisation.)
- Conversion rate optimisation (CRO) — turning the traffic you win through SEO into enquiries and sales.
Why AI search changes how you should pick an agency
The single biggest shift in 2026 is that search no longer means “Google” alone. A growing share of buyers now ask ChatGPT, Perplexity, Gemini or Google’s AI Overviews for recommendations. And those tools don’t rank ten blue links. They interpret intent, read structured content, and surface a small set of trusted sources.
This matters when choosing an agency for one simple reason: an agency that only optimises for traditional Google rankings is optimising for half the picture.
The signals that win AI visibility — clear entity definitions, schema markup, E-E-A-T (experience, expertise, authoritativeness and trust), an llms.txt file, and citation-worthy content — overlap with classic SEO but aren’t identical.
When you make your shortlist, ask each agency how they’ll keep you visible across Google and AI search. If they can’t answer, keep working through the list.
How we ranked them
There’s no single “best” SEO agency, so we judged each on the factors that actually matter when you’re hiring one:
- Specialism & focus — are they SEO-only or SEO-first, or is SEO just one service among many offered?
- Sector fit — who do they serve best: enterprise, e-commerce, SMEs, or regulated sectors like healthcare and finance?
- AI search / GEO readiness — do they optimise for ChatGPT, Gemini and Perplexity, not just Google?
- Technical & content depth — how much expertise do they have in achieving sustainable rankings?
- Transparency — do they offer clear pricing, clear reporting and realistic promises (no unsubstantiated “guaranteed #1” claims).
- Track record & reviews — do they publish demonstrable results and independent feedback on Clutch, Google and beyond?
The 10 best SEO agencies in London (2026)
1. Figment Agency — best for expert-led businesses & AI search visibility
Let’s be transparent: this is our guide, so we’ve ranked ourselves first. Here’s why.
Figment is a London and Surrey-based SEO agency that has specialised in supporting expert-led businesses — healthcare, professional services and finance — since 2006.
Three things set us apart in 2026:
- AI search expertise. We were early to generative engine optimisation, helping clients get cited and recommended by ChatGPT, Gemini, Perplexity and Google’s AI Overviews, as well as achieving strong Google rankings.
- Sector specialism. Regulated, expert-led sectors such as healthcare, professional services and financial firms need SEO that understands compliance, trust and how prospective patients and clients research online. Our healthcare SEO and other professional-services work reflects this.
- Personal approach. Transparent pricing, direct access to senior specialists and a consistent point of contact throughout your campaign.
Best for: clinics, consultancies and professional firms that want to build authority and be found across both traditional and AI-powered search.
Location: London & Surrey.
Pricing: mid-market, transparent.
2. The SEO Works — best for data-led growth & transparent reporting
A multi-award-winning agency with over a decade of experience, The SEO Works blends technical SEO, content marketing and digital PR, and is well regarded for clear, transparent reporting. A strong all-rounder for mid-market businesses wanting measurable organic growth.
Best for: established businesses that value data and reporting clarity.
Pricing: mid-market.
3. ROAST — best for enterprise & performance media
Part of the TIPi Group, ROAST is a London performance-media agency with deep technical SEO, content strategy and link-building capability. Pricing starts at the enterprise end (typically £10,000+/month), reflecting its larger-brand client base.
Best for: enterprise brands with substantial budgets and complex sites.
Pricing: enterprise (£10K+).
4. Passion Digital — best for an AI-first independent approach
An independent London agency established over a decade, Passion Digital has leaned hard into an AI-first approach in 2026, offering intelligent forecasting, real-time optimisation and content automation built for a search landscape that now includes AI Overviews and LLM results.
Best for: brands wanting an independent agency with a modern, AI-aware methodology.
Pricing: mid to upper.
5. StudioHawk — best for pure SEO specialists
StudioHawk does one thing: SEO. With a London office and an award-winning, specialist-only model, it appeals to businesses that want focused SEO expertise rather than a full-service marketing agency.
Best for: businesses wanting a dedicated, SEO-only specialist.
Pricing: mid-market.
6. Re:signal — best for e-commerce & enterprise SEO
An award-winning London agency known for enterprise and e-commerce SEO, Re:signal pairs technical depth with content and digital PR for larger online retailers scaling organic revenue.
Best for: e-commerce and enterprise brands.
Pricing: upper/enterprise.
7. Go Up — best for content-led SEO & digital PR
A long-established London agency, Go Up combines SEO with content and digital PR, with a strong reputation for editorial-quality content and link earning.
Best for: brands prioritising content and authority-building.
Pricing: mid-market.
8. Tenet — best for SEO plus conversion
Tenet is a digital agency pairing SEO with conversion-rate optimisation and wider performance marketing. This is useful when you want traffic and the onsite experience to convert it.
Best for: businesses that want SEO and CRO (Conversion Rate Optimisation) under one roof.
Pricing: mid-market.
9. ClickSlice — best for SMEs on a tighter budget
A London SEO agency popular with small and medium businesses, ClickSlice offers accessible, results-focused SEO and training without enterprise-level price tags.
Best for: SMEs that want solid SEO at an affordable price.
Pricing: accessible.
10. Genie Crawl — best for small businesses & local SEO
Genie Crawl is a London digital agency serving SMEs. Their focus is on local SEO, helping smaller businesses achieve visibility within their physical location and in the Google Maps Local Pack.
Best for: small and local businesses building visibility.
Pricing: accessible.
At a glance: London SEO agencies compared
| Agency | Best for | Specialism | AI search / GEO | Pricing tier |
|---|---|---|---|---|
| Figment Agency | Expert-led businesses; AI search | SEO + LLM/AI search (GEO) | Core strength | Mid-market, transparent |
| The SEO Works | Data-led growth | SEO, content, digital PR | Developing | Mid-market |
| ROAST | Enterprise brands | Performance media + SEO | Enterprise focus | Enterprise (£10k+) |
| Passion Digital | AI-first independents | SEO + AI/automation | Core strength | Mid to upper |
| StudioHawk | SEO-only specialists | SEO only | Developing | Mid-market |
| Re:signal | E-commerce/enterprise | Technical + e-comm SEO | Developing | Upper/enterprise |
| Go Up | Content & digital PR | Content-led SEO | Developing | Mid-market |
| Tenet | SEO + conversion | SEO + CRO | Developing | Mid-market |
| ClickSlice | SMEs on a budget | SEO + training | Limited | Accessible |
| Genie Crawl | Small & local business | Local SEO | Limited | Accessible |
How much do SEO agencies in London cost?
London pricing varies depending on the scope of work, the competitiveness of your sector and the agency you choose.
- Small business / local SEO: typically £500–£1,500/month.
- Mid-market retainers: approximately £1,500–£5,000/month. This is where many established businesses invest in ongoing SEO.
- Enterprise: £10,000+ per month for large organisations, complex websites and highly competitive industries.
- Projects & consultancy: one-off audits, website migrations or SEO strategies can range from a few hundred pounds to several thousand. Hourly consultancy typically starts at around £100–£200.
Be cautious of unusually cheap packages that promise guaranteed rankings. Good SEO takes time and should deliver long-term value. Rather than asking “What’s the cheapest option?”, ask which agency is most likely to help you achieve your business goals and deliver a worthwhile return on your investment.
SEO, GEO, local SEO — which do you actually need?
The answer depends on what you’re trying to achieve:
- Want to improve your Google rankings? Focus on technical SEO, high quality content and digital PR.
- Have a clinic, shop or service business with a physical London location? Prioritise local SEO, including your Google Business Profile, Map Pack, reviews and general local search visibility.
- Want to be found in AI-powered search? GEO (Generative Engine Optimisation) focuses on helping your business appear in platforms such as ChatGPT, Gemini and Google’s AI Overviews through clear site structure, trusted content and strong authority signals.
- Getting plenty of visitors but not enough enquiries? Consider conversion rate optimisation (CRO) to help more website visitors become customers.
For most businesses in 2026, these disciplines work best as part of a single digital strategy rather than separate activities.
London focus: areas and sectors
SEO in London isn’t one-size-fits-all. Competition varies hugely depending on where your business is based and the customers you’re trying to reach.
Central areas such as the City, Soho, Shoreditch, Mayfair, Canary Wharf and Westminster are highly competitive, while outer boroughs and the commuter belt, including Surrey where we’re also based, often benefit from a stronger focus on local SEO and service-area targeting.
Your sector is just as important. Healthcare and Harley Street clinics, legal and professional services, finance, property, hospitality and e-commerce all have different search behaviours, levels of competition and, in some cases, regulatory requirements.
The best SEO agency will understand both your market and your location, and tailor its strategy accordingly.
How to choose the right SEO agency for your business
Use this list as a starting point rather than a definitive ranking. Before choosing an agency, ask yourself these questions:
- Do they understand your sector? A healthcare clinic, law firm and online retailer all have different audiences, challenges and priorities.
- Can they explain their approach to AI-powered search? As search continues to evolve, your chosen agency should be able to explain how they’ll help you stay visible across both traditional search engines and AI platforms.
- Do they have strong technical expertise? Ask how they’ll improve your website’s performance, structure and technical SEO to support long-term rankings.
- Are they transparent? Look for clear pricing, realistic expectations and a straightforward explanation of what’s included.
- Who will you be working with? Find out who’ll be managing your campaign and whether you’ll have consistent points of contact.
- Can they demonstrate results? Independent reviews, detailed case studies and measurable outcomes will tell you far more than marketing claims.
FAQ
How much does an SEO agency in London cost?
Most London SEO retainers range from around £1,000–£5,000 per month for specialist work, while enterprise campaigns can cost £10,000 or more. Local SEO for small businesses may cost less, depending on your goals, competition and the scope of work.
What’s the difference between SEO and GEO?
SEO (search engine optimisation) helps your website rank in traditional search engines such as Google. GEO (generative engine optimisation) focuses on helping your business appear in AI-powered search platforms such as ChatGPT, Gemini and Perplexity. Both rely on high-quality content, strong technical foundations and authority, but GEO places greater emphasis on helping AI platforms understand and reference your content.
What makes a “good” SEO agency in 2026?
A good SEO agency combines technical expertise with high-quality content and a clear understanding of how people search online. As AI-powered search continues to grow, agencies should also be able to explain how they’ll help your business remain visible across both traditional and AI search.
Should I choose an SEO specialist or a full-service agency?
That depends on your goals. If SEO is a key part of your growth strategy, a specialist agency or an agency with strong SEO expertise may be a better fit than a general marketing agency where SEO is only one of many services.
How long does SEO take to work?
Most businesses begin to see meaningful progress within three to six months, although competitive sectors often take longer. SEO is a long-term investment, so be cautious of anyone promising instant results or guaranteed rankings.
Do I need a London-based SEO agency?
Not necessarily. SEO can be delivered remotely, but an agency with experience of the London market may have a better understanding of your local competitors, audience and search behaviour, particularly if local SEO is important to your business.
Why is Figment first on its own list?
Because this is our guide, and we believe we’re one of the strongest choices for expert-led businesses looking to grow their visibility across traditional and AI-powered search. We’ve explained our ranking criteria and included other agencies we believe are worth considering, so you can make an informed decision.
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