Find the best SEO agencies in London. Compare top-rated SEO companies and choose the right partner for your business.
London, United Kingdom
Based on Paul Street in London's EC2A postcode, this small agency focuses specifically on Google Analytics and GA4 consultancy alongside broader SEO…
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Gatelloo Marketing is a top-rated digital marketing agency with over two decades of international experience. Based in London, UK, and Peshawar, Paki…
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London, United Kingdom
Based in Cambridge, with a registered office in London, GenUp Digital works with owner-led service businesses across the UK, US, and UAE. The agency…
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London, United Kingdom
Working with IT startups worldwide, this agency is registered as Global Internet Marketing LLC with a listed London, England address, though the oper…
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London, United Kingdom
Globials is a small digital marketing team based in London that positions itself as a B2B SEO agency also serving B2C clients, working with businesse…
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London, United Kingdom
Glush operates as a digital marketing and creative agency based in London, with an additional office in Saint-André-lez-Lille, France. The agency des…
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Based in London's City Reach building on Greenwich View Place, Gluz Digital is a small SEO-focused agency working with D2C and B2B companies, includi…
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London, United Kingdom
A small team based in London specializes in search visibility that spans both traditional engines and AI-driven discovery tools. GMK Digital works wi…
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London, United Kingdom
A search marketing agency working with direct-to-consumer ecommerce brands, Go Amplify is listed in London but describes its base as Barnsley, South…
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London, United Kingdom
Founded by Alex Mungo, who brings over 15 years of SEO experience, this London-based agency works with businesses across the UK, ranging from small c…
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London, United Kingdom
Based in Clerkenwell, London, Go Up works with organisations ranging from startups and SMEs to larger brands and international governments, across se…
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London, United Kingdom
Good Signals is a small digital marketing agency based in London, founded in 2018, working with a team of up to ten people. It describes its clients…
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London, United Kingdom
Based at the Blue Fin Building in Southwark, London, Goodstuff Communications is a media planning and buying agency working with a team of 11-50 peop…
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London, United Kingdom
Based in London, Got Legs Digital works as a growth marketing agency focused on Property, Fintech and Start-up companies looking to grow revenue. Rat…
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London, United Kingdom
London businesses navigating an increasingly AI-influenced search landscape are the focus of Grapefruit Digital SEO, a small agency based in London,…
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London, United Kingdom
Based in London, Greenlight Commerce works with B2B, wholesale distribution, and B2C companies looking to design and build digital commerce platforms…
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London, United Kingdom
Greenlight Digital is a London-based digital marketing agency specialized in providing cutting-edge solutions for businesses looking to enhance their…
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London, United Kingdom
Based in London, Gretor Ltd has operated since 2001, running a small team that offers digital marketing services alongside domain, hosting and web in…
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London, United Kingdom
Gripped is a London-based digital marketing agency working exclusively with B2B SaaS, AI and technology companies, typically those scaling past £2m A…
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London, United Kingdom
Based in London, Grow Digital Services Ltd operates as a small team of ten or fewer, describing itself as a strategic growth consultancy focused on B…
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The complete migration playbook: what to freeze before launch, how to build a redirect map that actually holds, what to test on the staging site, and how to read the first eight weeks after go-live.
2026-08-02 · 12 min read
How B2B search really works: bottom-of-funnel pages before blog volume, comparison and alternatives content, product-led assets, and attribution that survives a six-month cycle.
2026-08-02 · 11 min read
When template-generated pages work, when they get ignored, and how to build a programmatic set that survives quality updates: real data, real demand, real internal linking.
2026-08-02 · 11 min read
726 agencies are listed in London, 19% of the 3,907 recorded in United Kingdom — the country's largest city by agency count. 659 publish a direct contact.
In London: SEO (97%), SEA/PPC (54%), Social Media (51%), Web Design (50%), Content Marketing (48%). An agency that ticks every box is rarely good at all of them: look at what it puts first.
Proximity genuinely matters in two cases: local SEO — Google Business profile, reviews, "near me" queries — and needing to meet in person. For an e-commerce or SaaS site targeting the whole country, an agency in London holds no structural advantage over one elsewhere in United Kingdom. The useful criterion stays experience with your type of site.
| Team size | London | Typically |
|---|---|---|
| 1-10 | 526 (72%) | Solo consultant or small studio. Direct access, limited capacity. |
| 11-50 | 108 (15%) | Separate roles: technical, content, link building. |
| 51-200 | 3 (0%) | Structured accounts, process, formal reporting. |
| 200+ | 8 (1%) | International group, enterprise accounts. |
The 726 agencies on this page are ordered by how complete their listing is, never by payment: no position is for sale here. The information is collected from each agency's own website, checked as live. An agency can claim its listing to correct it, complete it, or connect its Search Console data.
What does SEO cost in London? Stated engagement floors here start at $1,000+. That figure says what size of engagement the agency takes on, not what yours will cost: the quote depends on the state of the site, the competition and the volume of content to produce.
Small local agency or large firm? 72% of agencies in London have fewer than ten people. At that size you talk directly to whoever does the work — the main advantage, and the main limit the day the engagement grows.
How do you check an agency before signing? Ask for a measured case on a site comparable to yours, with before and after figures. Check who will actually do the work. And get it in writing what stays yours when the contract ends: content, access, accounts.
All agencies in United Kingdom · Agencies by country · SEO guides
