Best SEO agencies in London
desk research from public sources- Seven London SEO agencies, ordered by how closely each fits a London SEO buyer and how much it can show. Exposure Ninja leads on before-and-after figures with starting numbers, and its awards are confirmed on the organisers' lists.
- Only three are headquartered in London: Re:signal, Reboot Online and Gripped. The other four run a London office from a base in Nottingham or Leeds.
- Re:signal and Gripped publish what they charge. SALT.agency publishes nothing, so its price here is our estimate and is labelled as such.
- Choose by sector: Re:signal for ecommerce, Gripped for SaaS, SALT.agency for technical enterprise SEO, Impression for large integrated search teams.
| Rank | Agency | Best for | Why we picked it | Starting price |
|---|---|---|---|---|
| 1 | Exposure Ninja | SEO and AI search with documented before-and-after figures | Before-and-after lead figures and awards confirmed on organiser lists | Not published |
| 2 | Re:signal | Enterprise ecommerce brands needing international SEO and GEO | Ecommerce SEO with revenue-based results and a published engagement floor | From £10,000 per month |
| 3 | Reboot Online | Enterprise SEO, digital PR and AI search visibility | Enterprise SEO and digital PR with 53 published case studies | Not published |
| 4 | Gripped | B2B SaaS and tech firms wanting SEO tied to pipeline reporting | SEO for SaaS firms, reported on pipeline, with published tiers | From £3,500 a month |
| 5 | Hallam | B2B search programmes tied to pipeline | B2B-only search programmes with a 35-person team and London office | Not published |
| 6 | SALT.agency | Enterprise technical, international and ecommerce SEO | Technical SEO depth for enterprise brands such as Cloudflare | From about £5,000 a month (our estimate) |
| 7 | Impression | Enterprise SEO, PR and paid search | A 120-plus person integrated search team with recent awards | Not published |
Prices checked October 2026. Estimates say so in the price itself. How we choose agencies: our method.
How we picked these
We started with agencies that list SEO as a core service, show search results for named clients and have an office in London, checked against the postcode on their own site. Three are headquartered in London. Exposure Ninja, Hallam and Impression are based in Nottingham with a London office, and SALT.agency is based in Leeds with one. Every agency here is an active company with a number we could check.
The order follows fit first: how central SEO is to what the agency sells, and how closely its work matches a typical London buyer. After that we looked at what each agency can show, meaning case studies with starting figures and windows, awards confirmed on organiser lists, published prices and a named team. Exposure Ninja leads because its figures come with starting numbers. Impression sits last because several of its figures lack a baseline. This is desk research from public sources only, and we have not watched any of them run a campaign. More on how we choose agencies.
1. Exposure Ninja
Exposure Ninja is a search marketing agency founded in 2011 and run as a remote team, with offices in Nottingham and London. It covers SEO, AI search, content, PPC and web development for mid-market businesses in finance, healthcare, legal and renewables.
What they do best
- Before-and-after results. Russell Regulatory Consultants went from 24 organic leads in the previous year to 91 in six months, and Elite Renewables conversions rose from 84 to 358.
- Confirmed awards. It won at the UK Search Awards 2024 and the Global Search Awards 2025, both confirmed on the organisers’ lists.
- Custom reporting. Reporting runs through custom dashboards, and the SEO page sets out a three-step process.
Where they fall short
- One named person. It names only its CEO, so you cannot see who will run the account before a consultation.
- No prices. Cost is not visible before a call.
2. Re:signal
Re:signal is a remote ecommerce SEO and GEO agency founded in 2012. It is headquartered in London, with offices in Manchester and Los Angeles. Clients include ASICS, FatFace, Vivobarefoot and Expedia, and its label is From £10,000 per month.
What they do best
- Revenue-based results. Vivobarefoot grew organic revenue by 68% year on year between August 2024 and January 2025, and ASICS reports a 20X organic revenue increase on an engagement that began in December 2018.
- A defined team and cadence. The approach page commits to a specialist pod, weekly communication, quarterly business reviews and always-on dashboards.
- Awards on the organiser’s list. It won several categories at the UK Search Awards 2022.
Where they fall short
- A high floor. The stated £10,000 a month engagement floor excludes smaller ecommerce brands.
- No team page. We found no named team.
3. Reboot Online
Reboot Online is a fully remote agency headquartered in London, incorporated in 2012. It covers SEO, digital PR and GEO mainly for enterprise and mid-market brands, and publishes 53 case studies.
What they do best
- Share of voice results. The TUI case study moved share of voice from 46% to 78% in a family-holiday category, and Liquidation Centre reports a 92% year-on-year rise in GA4-tracked leads.
- Keyword gains. Numan reports ranking gains across 1,120 UK keywords.
- A confirmed award and a method. It won Best Large SEO Agency at the European Search Awards 2026 and works in two-week sprints with monthly reports.
Where they fall short
- No prices or team size. Cost and headcount are not published.
- No delivery team named. Beyond its leadership, nobody is listed, so you cannot see who does the work before a call.
4. Gripped
Gripped is a London B2B marketing agency, founded in 2017, selling SEO, GEO, paid media and website work only to SaaS, AI and tech companies. Its label is From £3,500 a month, with a six-week onboarding plan on its pricing page.
What they do best
- Pipeline reporting. Cloudbooking shows £2.4m of qualified pipeline over 12 months from a 50% rise in monthly sales-qualified opportunities, and Crownpeak shows £1.3m of pipeline in one quarter.
- Published tiers. Monthly prices and what each tier includes are public.
- A stated working rhythm. It states a shared Slack channel with named specialist roles and weekly syncs on its Scale tier.
Where they fall short
- SEO is one channel of several. The SEO-led Performance tier starts at £7,500 a month, before any ad spend.
- No starting baselines. Both headline figures come without one.
5. Hallam
Hallam is a Nottingham agency of about 35 people with a London office. It sells SEO, AI search, paid media, digital PR and web work only to B2B and purpose-led brands.
What they do best
- Pipeline-linked results. Aberdeen’s LinkedIn lead campaign reached a cost per qualified lead 15% below the previous average, and Holcim UK kept 94% of organic search equity through a 2025 domain migration.
- A confirmed award. It won Best LLM Adoption & Integration at the European Search Awards 2026.
- A structured start. Every SEO engagement begins with an audit, and about 35 staff are named with roles.
Where they fall short
- No prices. It publishes no prices, packages or minimum budgets, so a buyer cannot judge fit before a call.
- Short result windows. The cited results cover 3 to 12 months, such as Aberdeen over 3 months, so longer-term effect is not shown.
6. SALT.agency
SALT.agency is a Leeds-based technical SEO agency with offices in London and Massachusetts. It works for enterprise brands such as Cloudflare, JetBrains and Jewson, builds free SEO tools and has added AI search optimisation. Our price label for it is From about £5,000 a month (our estimate).
What they do best
- Measured traffic growth. The Cloudflare study reports US organic traffic from 22.4K to 235.9K monthly visits over three years, and the Qodana study reports non-brand position-one rankings up 1650% to 105.
- A confirmed award. It won a Silver at the European Search Awards 2025.
- A deep archive. It publishes 21 case studies.
Where they fall short
- No prices or delivery team. It shows only its leadership team, so a buyer cannot judge budget fit or who does the day-to-day work.
- A missing baseline. The International Filter Products result has no stated starting figure or window.
7. Impression
Impression is a Nottingham performance marketing agency of 120+ people, with offices in London, Manchester and New York. It covers SEO, AI search, paid media and digital PR for brands such as Clarins, MOTORS and The Access Group.
What they do best
- Recent award wins. It won Best Large PPC Agency and Best Large Integrated Search Agency at the European Search Awards 2025, and Best UK SEO Campaign (MOTORS) at the Global Search Awards 2026.
- Revenue results. Clarins landing-page revenue rose 174% in Australia and 359% in Singapore.
- Scale and tooling. The 120-plus team has in-house tools Alexis and Velocity.
Where they fall short
- Anonymous case studies. Several publish percentage uplifts without baselines.
- No price. No price or minimum budget is given.
Which one fits your project
| If you are | Pick | Because |
|---|---|---|
| A mid-market business wanting results with baselines | Exposure Ninja | Documented before-and-after figures and confirmed awards |
| An ecommerce brand with a large budget | Re:signal | Ecommerce focus, London HQ and a published engagement floor |
| An enterprise running search with digital PR | Reboot Online | 53 case studies and remote London team |
| A SaaS or tech company | Gripped | Tech-only clients, published tiers and pipeline reporting |
| A B2B marketing team | Hallam | B2B-only focus and a London office |
| An enterprise with a complex site | SALT.agency | Technical SEO depth for brands such as Cloudflare |
| A large brand wanting search, PR and paid under one team | Impression | 120+ people and recent search awards |
What SEO in London actually costs
A monthly retainer pays for the agency’s time. It rarely covers everything a campaign needs. When you compare quotes, check whether each of these is included or charged on top:
- Content. Articles, landing pages and copy are often a separate line.
- Digital PR and links. Some agencies fold outreach into the retainer; others bill per campaign.
- Development fixes. Technical findings need developers to implement them, yours or the agency’s.
- Tools and reporting. Dashboards, crawl software and rank tracking may be bundled or passed through.
- Ad spend. At agencies that sell paid media, the retainer excludes the budget spent on ads.
- Contract terms. Check the minimum term and notice period before you sign.
Only Re:signal and Gripped publish a monthly price. As a rough guide (our estimate), small-business SEO retainers run from about £500 to £1,500 a month, while enterprise and ecommerce programmes at agencies like those here start in the thousands and climb from there. We have not seen a London premium confirmed in published prices, so compare quotes for the same scope.
FAQ
Re:signal states that engagements begin at £10,000 a month, and Gripped publishes tiers from £3,500 a month (both checked October 2026). The other five on this page publish no price. For SALT.agency our estimate is from about £5,000 a month, based on its enterprise client list. Treat London retainers as our estimate when a price is not published, and expect ad spend, content and development time to cost extra.
Not necessarily. Agencies on this page that run London offices from Nottingham or Leeds work with clients remotely, and Re:signal and Reboot Online describe themselves as remote teams. A local office helps if you want in-person workshops. Ask where the people on your account sit.
Look for case studies with baselines and time windows, a named person who runs the account, published reporting cadence and clear pricing terms. Several agencies here quote percentage gains without a starting figure, which makes the result hard to judge.
The service is the same. A London address mainly signals access to in-person meetings and a larger local talent pool. Only two agencies here publish rates, so compare quotes for the same scope.