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, Grow Up Digital is a small digital marketing team working with businesses across a range of niche sectors, including manufacturers s…
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London, United Kingdom
London-based Growth Division works as a growth marketing agency for startups, scale-ups and ambitious SMEs, with stated expertise across sectors incl…
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London, United Kingdom
A HubSpot Diamond Partner based in London, Growth London Ltd. works as a CRM consultancy and CMS agency for businesses moving onto or already using H…
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London, United Kingdom
Based in London, GrowthGirls positions itself as a growth marketing agency working with clients internationally, from startups to established compani…
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London, United Kingdom
Habizen Tech, based in London, works with startups, service businesses, and growing brands across the United Kingdom and United States. The small tea…
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London, United Kingdom
Based in London, this agency focuses on B2B digital marketing, working with organisations across sectors including B2B SaaS, clean energy, education,…
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London, United Kingdom
Based at Old Street in London, Hallway Studios works with direct-to-consumer brands building and running online stores on Shopify and Shopify Plus. C…
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London, United Kingdom
Hamedson Design Studio is a London-based digital marketing agency specialized in delivering innovative design solutions and comprehensive digital mar…
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London, United Kingdom
Hanson Brown is a London-based digital marketing agency specialized in delivering comprehensive and innovative marketing solutions tailored to the un…
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London, United Kingdom
Based in Hackney, London, Harmonypark is a small digital studio (team of 1-10) that works with creative companies, agencies and brands to build the t…
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London, United Kingdom
Based at 75 Newman Street in central London, Harvest Digital is an independent media agency founded in 2001, structured as an employee-owned business…
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London, United Kingdom
A small team based in Ilford, London, Hastech Solutions works with businesses seeking web development, digital marketing and mobile app support, rang…
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London, United Kingdom
Hearts & Minds is a creative consultancy focused on driving growth through innovative strategies and creative solutions. They blend commerciality wit…
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London, United Kingdom
Based in Tooley Street, London, this small agency describes itself as "The Heavyweight SEO Company," working with clients ranging from small startups…
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London, United Kingdom
Based in Tunbridge Wells with a base in Kent, Herald Digital works with businesses across Kent and London — including Tunbridge Wells, Sevenoaks, Can…
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London, United Kingdom
Based in Woolwich, London, Himal Tech has offered digital services since 2012 to businesses across the capital and further afield, with a client base…
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London, United Kingdom
Hiyield is a small London-based digital agency working with startup founders, marketing managers, creative agencies, charities and non-profits, and a…
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LONDON, United Kingdom
Based in London, HMDG works specifically with healthcare businesses, focusing on physiotherapists, chiropractors and musculoskeletal (MSK) clinics. T…
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London, United Kingdom
Based in London, HollowCore is a small team that pairs customer service staff in the UK and US with developers, designers and other specialists based…
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Based in London, HostHelp combines web infrastructure with digital marketing services aimed at businesses that need both a technical foundation and o…
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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
