Find the best SEO agencies in London. Compare top-rated SEO companies and choose the right partner for your business.
London, United Kingdom
A small London-based team, Hype Insight Ltd works with businesses looking to scale ad spend into measurable revenue growth, positioning itself around…
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London, United Kingdom
Based in London, this agency works with businesses across the United Kingdom, Italy, and Spain, with a particular focus on local businesses, medical…
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London, United Kingdom
An SEO consultancy operating from London, I-AM-SEO is run as a one-person practice serving small and mid-sized businesses across a range of sectors,…
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London, United Kingdom
Operating since 1998, IC Design is a small London-based creative agency working from Soho meeting space with registered offices on York Street. It fu…
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London, United Kingdom
Based in London, Iceni is a small studio (1-10 people) that has operated since 2001, working with ambitious companies, public sector bodies, and orga…
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London, United Kingdom
Based in London, this small digital marketing consultancy has been operating for 13 years, working with businesses across a range of sectors includin…
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London, United Kingdom
ID Studio is a web design agency based in London, with an additional focus on the Richmond area, working with brands seeking a redesign, a replacemen…
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London, United Kingdom
A small studio based in East London's Jack's Place, Igloo works with companies across a range of sectors, from those wanting to appear affordable or…
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London, United Kingdom
Based in London, Ignite SEO London works with businesses ranging from tech startups to established brands seeking better Google visibility. The agenc…
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London, United Kingdom
Based in London, IHS is a small digital agency, sized at 1-10 team members, working across web design, development and digital marketing. The company…
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London, United Kingdom
Founded in London with a second office in Singapore, Imperial Leisure works with clients across the globe, positioning itself around brands that want…
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London, United Kingdom
Based in Wapping, East London, with a second office in Buenos Aires, Impero works with consumer brands looking to move quickly and connect with cultu…
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London, United Kingdom
Based in Bromley, on the London and Kent border, Improve My Search Ranking is a small SEO specialist working with service-based businesses, from smal…
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London, United Kingdom
Based in London, this consultancy works exclusively with Financial Services and FinTech companies, having rebranded from Inbound FinTech to Evara. It…
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London, United Kingdom
InDigital Group is a London-based digital marketing agency specialized in delivering ROI-driven SEO and PPC advertising consultancy. With a mission t…
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London, United Kingdom
A small digital marketing team based in London, iNeedSocial works with ambitious businesses looking to build a presence across social media and searc…
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London, United Kingdom
Operating from Clandon Street in London, this small agency (team of 1-10) positions itself as an influencer and social media marketing specialist rat…
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London, United Kingdom
Innovative Edge Technologies operates out of London, with an additional presence indicated by a US contact number, and works with businesses across s…
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London, United Kingdom
Based in London, this agency works with businesses, artists and individuals across Central London, Greater London and the wider UK, ranging from earl…
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London, United Kingdom
Insidigital is a small London-based web design and digital marketing agency run by founder Rosario Serratore, who works directly with clients as a di…
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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
