Find the best SEO agencies in London. Compare top-rated SEO companies and choose the right partner for your business.
London, United Kingdom
Based in London, this agency works with UK businesses seeking to improve their visibility on search engines, positioning itself as a full-service SEO…
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London, United Kingdom
Based in London, British Multi Designers is a small digital agency (team of 1-10) offering web and mobile app development alongside digital marketing…
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Britmark Solutions is a London-based digital marketing agency specialized in delivering comprehensive SEO, PPC, and web development services. With a…
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London, United Kingdom
Based in London, this agency focuses on healthcare and clinic clients, including osteopaths, physiotherapists and clinical massage practices, though…
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London, United Kingdom
Founded in 2009 and based on Stephen Street in London, Builtvisible is a specialist SEO, content and digital PR agency that has since become part of…
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London, United Kingdom
Bulldog Digital Media is a London-based digital marketing agency specialized in search engine optimization (SEO) that prides itself on transforming t…
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London, United Kingdom
Burst Digital is a London-based digital marketing agency specialized in branding, web design, and comprehensive digital marketing solutions. With a u…
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Based in London, Buzzozo Ltd is a small digital marketing agency (team of 1-10) working with UK businesses across sectors including trades and home s…
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London, United Kingdom
Byter Ltd is a small digital marketing agency based in London, founded in 2018, working with businesses in hospitality, fitness, retail, beauty and w…
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London, United Kingdom
Based in London, CAE Business Solutions LTD works as a small digital marketing team, with a service range built around helping businesses grow online…
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London, United Kingdom
Calashock focuses exclusively on B2B ecommerce, working with merchants in industries such as hardware and ironmongery, construction and building mate…
View ProfileLondon, United Kingdom
Caliston is a London-based digital marketing agency specialized in creative online solutions that drive business growth and enhance user engagement.…
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London, United Kingdom
A small digital marketing agency based in London, CamRojud works with businesses seeking to grow search visibility and paid campaign performance, as…
View ProfileLondon, United Kingdom
Carnaby West is a London-based digital marketing agency specialized in delivering innovative and tailored marketing solutions to businesses of all si…
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London, United Kingdom
Carrot Communications is a London-based digital marketing agency specialized in public relations for early-stage and fast-growth companies. With a mi…
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London, United Kingdom
Based in London, Casa Collina works specifically within the hospitality sector, positioning itself as a commercial and creative partner to hotels and…
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London, United Kingdom
Caspia is a London-based business development and marketing consultancy with over 20 years of experience. We specialize in helping SMEs and larger bu…
View ProfileLondon, United Kingdom
Catalyst Ads Ltd is a London-based digital marketing agency specialized in performance-driven marketing strategies that accelerate business growth. W…
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London, United Kingdom
Based in London, this small digital marketing agency works with a range of business types, including property management firms, renewable energy supp…
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London, United Kingdom
Based in Bankside, London, with additional offices in Hong Kong and Madrid, Cedar Communications operates as part of the Omnicom network and works wi…
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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
