A growing share of buying decisions now starts with a question to ChatGPT, Gemini or Google’s AI Mode, not with a list of blue links. For a London business, that changes what an SEO agency has to deliver. Ranking on page one still matters. Being the brand an AI assistant names in its answer matters just as much.
London has dozens of agencies that say they do this. We researched the market and scored the strongest on five criteria, so you can see at a glance which one suits your business, your sector and your budget. Each profile below covers what the agency does in AI search, the technology behind it, its track record and what it costs.
- How We Ranked the Agencies
- Rankings of the Top AI SEO Companies in London: At a Glance
- Score Breakdown
- The 6 Best AI SEO Agencies in London
- Which Agency Fits Your Business
- Pricing Compared
- What a London AI SEO Agency Does for You
- FAQs
- Which Is the Best AI SEO Agency in London?
- How Much Does an AI SEO Agency in London Cost?
- What Is the Difference Between an SEO Agency and an AI SEO Agency?
- Which London Agency Is Best for Ecommerce AI SEO?
- Which Agency Is Best for B2B Companies?
- How Long Does AI SEO Take to Work?
- Do These Agencies Work With Companies Outside London?
- Are There Good AI SEO Agencies Outside London?
How We Ranked the Agencies
Every agency was scored from 0 to 5 on five criteria, for a total out of 25.
| Criterion | What earns a high score |
|---|---|
| AI search service | A defined AI search or GEO service with clear stages, covering the main AI platforms |
| Measurement and technology | Its own tools, platform or tested method for tracking and improving AI visibility |
| Authority building | In-house digital PR and content capable of earning mentions on the sites AI assistants trust |
| Track record | Years in business, team depth, awards and named clients |
| Pricing clarity | Published rates or project sizes that let a buyer budget before the first call |
Scores are based on each agency’s published services, company records and client-review profiles as of October 2026. Prices are shown in US dollars, as the agencies list them. AI SEO, GEO (generative engine optimisation) and AEO (answer engine optimisation) are used for the same work in this guide; our article on SEO vs GEO covers the differences from traditional SEO.
Rankings of the Top AI SEO Companies in London: At a Glance
| Rank | Agency | Score | Best for | Founded | Pricing |
|---|---|---|---|---|---|
| 1 | Found | 22/25 | One platform for search and AI visibility | 2005 | About $150/hour |
| 2 | Re:signal | 22/25 | Ecommerce brands | 2012 | $200 to $300/hour |
| 3 | Reboot Online | 19/25 | Digital PR and tested methods | 2012 | Custom quote |
| 4 | Passion Digital | 19/25 | AI search with paid media | 2012 | $100 to $149/hour |
| 5 | NOVOS | 18/25 | Growing online stores | 2018 | $150 to $199/hour |
| 6 | Builtvisible | 18/25 | Complex enterprise sites | 2009 | Custom quote |
Found and Re:signal tie on points. Found takes first place because it serves every sector and owns its measurement platform, while Re:signal is the better choice for retailers.
Score Breakdown
| Agency | AI search service | Measurement and technology | Authority building | Track record | Pricing clarity | Total |
|---|---|---|---|---|---|---|
| Found | 5 | 5 | 4 | 4 | 4 | 22 |
| Re:signal | 5 | 4 | 5 | 5 | 3 | 22 |
| Reboot Online | 4 | 4 | 5 | 4 | 2 | 19 |
| Passion Digital | 4 | 4 | 3 | 4 | 4 | 19 |
| NOVOS | 3 | 2 | 4 | 4 | 5 | 18 |
| Builtvisible | 3 | 4 | 4 | 5 | 2 | 18 |
The 6 Best AI SEO Agencies in London
1. Found
Best overall, and best for brands that want one view of search and AI
| Detail | Information |
|---|---|
| Founded | 2005 |
| London office | Johnson Building, 77 Hatton Garden, EC1N |
| Team | 50 to 99 |
| Pricing | Around $150 an hour. Minimum budgets from $1,000 to $10,000 |
| Website | found.co.uk |
| Our score | 22/25 |
Overview. Found calls itself an Everysearch agency. The idea is that people now look for brands on Google, on social platforms and inside AI assistants, and that all of it should be planned and measured together. It is a Google Premier Partner and also holds partner status with Meta, Microsoft, Pinterest, LinkedIn and TikTok.
AI search services. Its GEO service runs in four stages: an audit of how AI engines currently present the brand, a strategy, the technical implementation, and ongoing optimisation. Content strategy and digital PR are handled in-house, so the work that earns outside mentions sits with the same team that fixes the site.
Technology and measurement. This is where Found leads the list. It has built its own platform, Luminr, which maps a brand’s visibility across AI platforms and traditional search engines in one place. Most agencies rent a third-party tracker. Found owns the tool and shapes it around its method.
Strengths
- Own visibility platform covering AI and traditional search
- Full service from audit to ongoing work, with PR in-house
- Twenty years of trading and a team large enough for enterprise accounts
- Published rate and accessible minimum budget
Limitations
- A broad agency, so less specialised by sector than Re:signal or NOVOS
- Reporting is tied to its own platform
2. Re:signal
Best for ecommerce brands
| Detail | Information |
|---|---|
| Founded | 2012 |
| London office | 20 Eastbourne Terrace, Paddington, W2 |
| Team | 10 to 49 |
| Pricing | $200 to $300 an hour |
| Website | resignal.com |
| Our score | 22/25 |
Overview. Re:signal works only with online retailers and describes itself as a growth consultancy for search-driven ecommerce. Founder Kevin Gibbons has worked in search since 2003. The agency has won 88 Search Awards across UK, European and global events, the most of any SEO agency at those awards, and its clients include ASICS, Under Armour, Expedia and N Brown.
AI search services. Its AI search service is built for product discovery. It covers ChatGPT, Gemini, Perplexity, Claude and Google’s AI Overviews, and it is one of the few agencies already planning for agentic commerce, where an AI assistant compares and buys on the shopper’s behalf. In 2025 it acquired Root Digital, a specialist digital PR agency, which gave it a larger in-house team for earning the press mentions that AI assistants draw on.
Technology and measurement. Re:signal has the clearest measurement method of the six. It takes real customer search demand, turns it into natural-language prompts that reflect how people talk to AI tools, and tracks visibility, product recommendations and competitor performance against that fixed set. That gives a retailer a consistent benchmark from month to month.
Strengths
- Works only in ecommerce, so advice is specific to product and category pages
- Rigorous, repeatable measurement of AI visibility
- Strongest awards record on this list
- Digital PR team in-house after the Root Digital acquisition
Limitations
- The highest hourly rate here
- Not a fit for B2B or service businesses
- Two thirds of its clients are enterprise, so smaller stores may find it priced above their range
3. Reboot Online
Best for digital PR and evidence-based SEO
| Detail | Information |
|---|---|
| Founded | 2012 |
| London office | 727-729 High Road, North Finchley, N12 |
| Team | About 42 |
| Pricing | Custom quote per project |
| Website | rebootonline.com |
| Our score | 19/25 |
Overview. Shai and Naomi Aharony founded Reboot around one principle: test things before telling clients they work. Its controlled SEO experiments have been covered by Search Engine Roundtable, Ahrefs and Search Engine Journal. Clients include Viator, Confused.com, OnBuy, Forbes, Mattress Online and JOOR, and some have stayed for more than ten years.
AI search services. Reboot offers three connected services: GEO, AI optimisation and LLM optimisation. Together they cover how AI systems retrieve, cite and summarise a brand, and they run alongside traditional SEO as one strategy. The agency names ecommerce, finance, healthcare, travel and technology as the sectors that gain most.
Technology and measurement. Reboot has extended its testing habit to AI. It has published an experiment on how it influenced AI answers, which makes it one of very few agencies with first-hand data on what changes a model’s output. Its digital PR team, among the best known in the UK, lands coverage in major UK and US publications. Coverage of that kind helps shape which brands AI assistants name.
Strengths
- Recommendations backed by its own experiments
- Outstanding digital PR for building the authority AI relies on
- Long client relationships
- Founder-led and independent
Limitations
- No published pricing
- Smaller team than Found or Builtvisible
- Based in north London, away from the central agency districts
4. Passion Digital
Best for combining AI search with paid media
| Detail | Information |
|---|---|
| Founded | 2012 |
| London office | Holborn Tower, 137-144 New Oxford Street, WC1V |
| Team | Mid-sized, led by Managing Director Cecilia de la Viesca |
| Pricing | $100 to $149 an hour. Typical projects from $10,000 to $110,000 |
| Website | passion.digital |
| Our score | 19/25 |
Overview. Passion Digital is a search-led performance agency that works across B2C and B2B. It has been a Google Premier Partner every year from 2023 to 2026, and its client work spans financial services, healthcare, real estate and technology.
AI search services. GEO and AI search optimisation sit in its organic team alongside SEO, content strategy and digital PR. The paid side covers PPC, paid social, connected TV and programmatic. For a brand that wants its AI visibility planned together with its advertising, that range is the main attraction.
Technology and measurement. Passion was among the first UK agencies to turn AI search optimisation into a defined service. It has its own tools for measuring brand visibility inside ChatGPT, Perplexity and Google AI Overviews, and a research product called Deep Research (DRX) that feeds audience and competitor insight into strategy. Clients also get live reporting dashboards.
Strengths
- Organic, AI search and paid media under one roof
- Proprietary AI visibility tools and research product
- The lowest hourly rate of the six
- Experience in regulated sectors such as finance and healthcare
Limitations
- A generalist, so less depth in any single industry
- Digital PR is offered but is not the agency’s headline strength
5. NOVOS
Best for growing online stores
| Detail | Information |
|---|---|
| Founded | 2018 |
| London office | 37 Houndsditch, City of London, EC3A |
| Team | About 30 |
| Pricing | $150 to $199 an hour. Minimum project $5,000 |
| Website | thisisnovos.com |
| Our score | 18/25 |
Overview. Antonio and Sam started NOVOS to build an SEO agency for ecommerce alone, and it now calls itself the ecommerce growth agency for the era of AI. It has worked with more than 250 online brands across the UK, US and Europe and reports over £200 million in organic growth for them. Its awards include Best SEO Agency and Best Use of Search in Ecommerce at the Global Search Awards.
AI search services. NOVOS frames its work as discovery: how shoppers find, evaluate and choose products across organic search, paid media and AI platforms. AI visibility is part of every ecommerce strategy it writes, supported by technical SEO, content planning and digital PR.
Technology and measurement. NOVOS relies on its ecommerce playbook more than on proprietary software. Account managers work as an extension of the client’s team, and client reviews consistently praise its project management and communication.
Strengths
- Ecommerce specialist with a large base of comparable clients
- Clear published pricing and a modest minimum
- Strong client reviews for communication
- A younger agency built around current search behaviour
Limitations
- No proprietary AI tracking platform
- Smallest and newest agency on the list
- Ecommerce only
6. Builtvisible
Best for technically complex and enterprise websites
| Detail | Information |
|---|---|
| Founded | 2009 |
| London office | Gilray House, 146-150 City Road, EC1V |
| Team | 51 to 200 |
| Pricing | Custom quote per project |
| Website | builtvisible.com |
| Our score | 18/25 |
Overview. Builtvisible is one of the most technically respected SEO teams in the UK. It is now part of Brave Bison, a media, marketing and technology group that also owns SocialChain and Engage Digital Partners. Its specialities are technical SEO, data, content strategy, digital PR, and design and development.
AI search services. The agency positions its work as making brands visible wherever people search, and describes its team as working at the leading edge of AI-powered search. Its strength is the hard technical end: large site migrations across several markets, structured data, and content engineering. These are the foundations that decide whether AI systems can read a large site at all.
Technology and measurement. Being inside Brave Bison gives Builtvisible access to the group’s AI, media and technology teams, and to social and sports marketing specialists. For a big brand, that means search, social and AI visibility can be planned as one programme.
Strengths
- Deep technical expertise for large and multi-market sites
- Development and data skills in-house
- Backing and wider services of the Brave Bison group
- Seventeen years of experience
Limitations
- No published pricing
- Aimed at larger organisations
- AI search is part of its wider search offer, not a separately packaged service
Which Agency Fits Your Business
| Your business | Best choice | Runner-up |
|---|---|---|
| Online retailer with an established brand | Re:signal | NOVOS |
| Growing online store with a smaller budget | NOVOS | Found |
| B2B or professional services firm | Passion Digital | Found |
| Enterprise with a large or multi-market website | Builtvisible | Found |
| Brand that needs press coverage and authority | Reboot Online | Re:signal |
| Finance, healthcare or other regulated sector | Passion Digital | Reboot Online |
| Company that wants SEO, paid media and AI search together | Passion Digital | Found |
| Travel or comparison brand | Reboot Online | Re:signal |
Pricing Compared
| Agency | Hourly rate | Minimum or typical project | Pricing model |
|---|---|---|---|
| Passion Digital | $100 to $149 | $10,000 to $110,000 typical | Project and retainer |
| Found | About $150 | $1,000 to $10,000 minimum | Project and retainer |
| NOVOS | $150 to $199 | $5,000 minimum | Retainer |
| Re:signal | $200 to $300 | Enterprise and mid-market retainers | Retainer |
| Reboot Online | Quoted per client | Bespoke | Custom |
| Builtvisible | Quoted per client | Bespoke | Custom |
London rates are among the highest in the UK. Passion Digital offers the lowest hourly rate, NOVOS has the clearest minimum, and Found has the lowest entry point. If an agency retainer is beyond your budget this year, a tracking tool and in-house time will cover the basics. Our list of AI visibility tracking tools starts at $20 a month.
What a London AI SEO Agency Does for You
The work falls into four parts, and all six agencies cover them.
- Baseline. Measuring how AI assistants describe your brand and your competitors today, across the questions your customers ask.
- Technical readiness. Making sure AI crawlers can reach your pages, and adding structured data so your products, services and business details are read correctly.
- Content. Rewriting key pages so they answer questions directly, with specific facts that AI systems can quote.
- Authority. Earning mentions in the press, reviews and industry sites that AI assistants already rely on.
The first results usually appear in Google’s AI features within weeks, because Google recrawls updated pages quickly. Changes in what ChatGPT and similar assistants say take longer, typically three to six months, as mentions build up across other sites. Our primer on generative engine optimization basics explains each stage in more detail.
FAQs
Which Is the Best AI SEO Agency in London?
Found ranks first in our scoring, with 22 out of 25, because of its Luminr visibility platform and its full-service GEO offer. Re:signal scores the same and is the best choice for ecommerce brands.
How Much Does an AI SEO Agency in London Cost?
Hourly rates among the six agencies run from $100 to $300. Minimum projects start between $1,000 and $10,000, and larger programmes reach $110,000 or more. Passion Digital has the lowest hourly rate and Re:signal the highest.
What Is the Difference Between an SEO Agency and an AI SEO Agency?
An AI SEO agency does everything a traditional SEO agency does, and also tracks and improves how your brand appears in AI-generated answers. That adds prompt-based measurement, content written to be quoted, and digital PR aimed at the sources AI assistants trust.
Which London Agency Is Best for Ecommerce AI SEO?
Re:signal for established retail brands, and NOVOS for growing stores. Both work only with ecommerce businesses.
Which Agency Is Best for B2B Companies?
Passion Digital. It works across B2B and B2C, has experience in finance, healthcare and technology, and can run paid media alongside AI search work.
How Long Does AI SEO Take to Work?
Expect early movement in Google’s AI Overviews and AI Mode within four to eight weeks of changes going live, and steadier gains across ChatGPT, Gemini and Perplexity over three to six months. Our comparison of AI Overviews and AI Mode explains how Google’s two AI features differ.
Do These Agencies Work With Companies Outside London?
Yes. All six serve clients across the UK and internationally. Re:signal, NOVOS and Reboot Online all work with brands in the United States and Europe.
Are There Good AI SEO Agencies Outside London?
Yes. Our wider guide to AI SEO agencies covers firms in other cities and countries.
