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's East End, AIBoost Marketing works with small teams and small businesses through to tech and B2B companies, start-ups, and organisat…
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London, United Kingdom
Based at 1 Northumberland Avenue near Trafalgar Square in London, AKR SEO Agency is a small team offering search engine optimisation and related digi…
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London, United Kingdom
Alfa Medio is a dedicated marketing agency based in London, specializing in search engine optimization (SEO) since 2013. With a strong focus on the U…
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Alfamedio LTD is a London-based digital marketing agency specialized in search engine optimization (SEO) and online advertising. Established in 2013,…
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London, United Kingdom
Operating from Great Portland Street in central London, Algo Digital Ltd is a small SEO consultancy founded in 2018, structured around a single consu…
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London, United Kingdom
Based in London, AlgoRhythm positions itself not as a standalone marketing agency serving brands directly, but as an SEO and performance marketing co…
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London, United Kingdom
AlgoSemantic is a London-based digital marketing agency specialized in delivering comprehensive software development and digital marketing services.…
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London, United Kingdom
Based in London and organized to serve clients across APAC, EMEA, LATAM, and North America, Allison UK positions itself as an end-to-end global commu…
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London, United Kingdom
Based in London, Allthings.social is a small studio formed by a marketer and a designer, working with a team of between one and ten people. The agenc…
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London, United Kingdom
Based in London, Altahonos works with individuals dealing with blackmail, sextortion, and unwanted online content rather than the broader search-engi…
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London, United Kingdom
Altlier is a small digital marketing and design team based in London, working with solopreneurs and small businesses that want to gain visibility and…
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London, United Kingdom
AMP27 is a London-based digital healthcare and medical communications marketing agency specialized in transforming the way healthcare brands engage w…
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London, United Kingdom
Amplio360 is a London-based digital marketing agency specialized in providing comprehensive digital solutions tailored for start-ups and small to med…
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London, United Kingdom
AMS Media Group is an independent media planning and buying agency based in the UK. With a focus on delivering clarity, creativity, and commercial re…
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Analogue Web is a London-based digital marketing agency specialized in delivering comprehensive online solutions that drive measurable results for bu…
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Andrel Braga is a London-based digital marketing agency specialized in web development and design, with a strong emphasis on creating user-centric di…
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Anglux is a London-based digital marketing agency specialized in boutique SEO and AI search consultancy. Nestled in the vibrant Shoreditch area, Angl…
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Anika Digital is a London-based digital marketing agency specialized in delivering expert SEO and bespoke web solutions tailored to meet the unique n…
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Anorak is a digital marketing agency based in the vibrant city of London, specializing in delivering innovative and tailored marketing solutions that…
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London, United Kingdom
Antigua Web Solutions is a London-based digital marketing agency specialized in delivering comprehensive online marketing services tailored to meet t…
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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
