The 10 Best Growth Hacking Agencies in London + Our Top Pick

This information is correct at the time of writing. Growth Method has made every attempt to ensure the accuracy and reliability of the information provided.

How did we compile this growth hacking agency list?

This agency list is the result of 3 main sources:

• Growth hacking agencies we know or have worked with

• Growth hacking agencies recommended by others we know or have worked with

• Online searches for growth hacking agencies

Long story short, we’ve done the hard work for you in helping you find the right growth hacking agency for you. If you want to understand the pros and cons of working with marketing agencies more broadly, check out our guide to marketing agencies: the good, the bad & the ugly, and if you’re open to agencies outside London specifically, see our wider list of the best growth hacking agencies.

What to look for in a good London-based growth hacking agency?

Here are our top recommendations of what to look for in a good London growth hacking agency:

• Growth marketing is a process, so you want an agency that understands the process and the culture that is required to be successful. The emphasis should be on strategy over tactics.

• Be cautious of agencies that were previously more general digital marketing agencies, or that have specialisms in a particular area (such as paid advertising, or search) and that have rebranded as a growth marketing specialist in the last few years.

• Ensure the growth hacking agency works with companies like yours, both in terms of customer type (B2B or B2C), and preferably industry as well. B2B and B2C growth require very different skillsets and approaches.

• A good growth hacking agency will have typically used their experience to develop a bespoke growth process for new clients. Ask them about it, and avoid anyone that appears to have a “one size fits all” approach.

If conversion rate optimisation specifically (rather than full growth hacking) is your priority, our dedicated guide to the best CRO agencies is a better shortlist to start from.

The best growth hacking agencies in London

In our opinion, the below are the best 10 growth hacking agencies in London.

Compare the shortlist at a glance

1. Ascendant

“Our team of senior growth specialists are highly experienced in digital marketing, go-to-market strategy, communications, customer experience design, event management and technology. We plan meticulously, execute rapidly, measure obsessively and optimise continuously to provide our clients with a service that achieves their objectives, effectively and transparently.”

About Ascendant:

• Website: https://ascendant.uk/

• Address: Ascendant, The Ministry, 79-81 Borough Road, London SE1 1DN

• HQ Country: UK

• Specialisms: B2B, Startups, Paid Media, Organic, CRO

2. Conversion Rate Experts

“We are the world’s leading agency for conversion rate optimization (CRO)—a term that we coined in 2007. We build amazingly effective webpages, and then we stick our necks on the line by insisting that we carry out scientific A/B tests to verify that we’ve significantly grown our clients’ businesses.”

About Conversion Rate Experts:

• Website: https://conversion-rate-experts.com/

• Address: Conversion Rate Experts (a Next 15 company), 207 Regent Street, London, W1B 3HH

• HQ Country: UK, USA

• Specialisms: CRO, B2B, Enterprise, Startups

3. Kurve

Kurve operates as a hybrid agency and consultancy, working on monthly retainers or single projects and building a bespoke team around each client’s goals rather than fitting clients into a fixed squad. It’s our overall top pick, detailed further below.

About Kurve:

• Website: https://kurve.co.uk/

• Address: Kurve, 86-90 Paul Street, London EC2A 4NE

• HQ Country: UK

• Specialisms: B2B, Paid Media, Organic

4. Rock Mission

Rock Mission bills itself as London’s leading growth hacking agency, helping clients design and execute integrated growth strategies across email, SEO, social and content, with a particular focus on conversion rate optimisation.

About Rock Mission:

• Website: https://rockmission.com/

• Address: Salty Commune, 6 Yorkton St, London E2 8NH

• HQ Country: UK

• Specialisms: Email, SEO, Social, Content, CRO

5. The Fifth Mark

The Fifth Mark positions its growth marketing approach as “science-and-strategy” rather than “hope-and-pray”, connecting user psychology, data analysis and digital marketing for ecommerce and DTC brands.

About The Fifth Mark:

• Website: https://thefifthmark.co.uk/outsourced-growth-marketing-teams/

• Address: 86-90 Paul Street, Shoreditch, London

• HQ Country: UK

• Specialisms: Ecommerce, B2C, DTC

6. True Up

True Up focuses on paid acquisition, conversion optimisation and data, with a stated track record of delivering low customer acquisition costs and high conversion rates for B2B and enterprise clients.

About True Up:

• Website: https://www.trueup.com/

• Address: TrueUp, 91 Brick Lane, London, E1 6QL

• HQ Country: UK

• Specialisms: B2B, Enterprise

7. GrowthRocks

Founded in 2014 and headquartered in London, GrowthRocks runs a systematic growth-hacking methodology built around the pirate metrics funnel (acquisition, activation, retention, revenue, referral), spanning A/B testing, email, content and CRO. Past and current clients span seed-stage startups through to Nokia and Revolut.

About GrowthRocks:

• Website: https://growthrocks.com/

• Address: 21 Aylmer Parade, Aylmer Road, London N2 0AT

• HQ Country: UK

• Specialisms: Growth hacking methodology, CRO, SEO, Content, Email

8. GrowthCurve

GrowthCurve is a performance agency built around paid social and performance creative, running weekly sprints across acquisition, creative, CRO, lifecycle and analytics as an in-house extension of a client’s team. It’s particularly well known in crypto, fintech and mobile.

About GrowthCurve:

• Website: https://growthcurve.co/

• Address: 86-90 Paul Street, Floor 3, London EC2A 4NE

• HQ Country: UK

• Specialisms: Paid Social, Performance Creative, CRO

9. Gripped

Gripped works exclusively with B2B SaaS, AI and tech companies roughly between £2m and £50m ARR, covering demand generation, paid media, SEO and GEO (generative engine optimisation), and reports against pipeline and revenue rather than vanity metrics.

About Gripped:

• Website: https://gripped.io/

• Address: 140-148 Borough High Street, London SE1 1LB

• HQ Country: UK

• Specialisms: B2B SaaS, AI, Tech, Demand Generation, SEO, GEO

10. Growth Division

Growth Division runs a channel-agnostic expert network for startups, scale-ups and ambitious SMEs, using its own AI growth operating system to coordinate experiments across a rotating pool of channel specialists rather than a fixed generalist team.

About Growth Division:

• Website: https://growth-division.com/

• Address: Clerkenworks, 40 Bowling Green Lane, London EC1R 0NE

• HQ Country: UK

• Specialisms: Growth Experimentation, B2B, B2C, Startups

Which is the best growth hacking agency in London?

So the question we’re often asked … if you had to pick one, who would we choose?

This is very much an “it depends” answer but in general Kurve are a great team to work with.

Their overall approach is exactly how we think a growth hacking agency in London should operate:

Kurve is a hybrid agency & consultancy. We support on execution or strategic insight. We work on a monthly retainer or on specific projects. Rather than squeezing your brief into a fixed team, we build the team tailored to your goals. We have a broad mix of digital marketing experts. Rather than generalists, we hand-pick specialists. We use a range of robust tools, some are partners and some we’ve built for specific marketing challenges.

https://kurve.co.uk/about-us/

In addition to a range of client testimonials throughout the site, they have an impressive list of success stories. They detail their approach for both scale-ups and corporates, and also come highly recommended by our good friends at Growth Mentor.

About Growth Method

Growth Method is the agentic marketing platform for B2B teams: plan your strategy, launch campaigns, and analyse what worked, with pre-built AI agents that work from your live marketing data.

Whichever agency from this list you brief, the vetting process is really the same discipline growth teams should run internally: a clear hypothesis, a plan with a defined “done when” condition, and a proper before/after read once the work is live. That’s the workflow Growth Method builds for B2B marketing teams: capture the growth ideas your team or agency generates, score them against your goals, launch them as campaigns, and get an automatic analysis when each one is due, instead of losing the thread in a shared doc or Slack channel.

We are on-track to deliver a 43% increase in inbound leads this year. There is no doubt the adoption of Growth Method is the primary driver behind these results.

Laura Perrott, Colt Technology Services

If you’re briefing a London growth hacking agency this quarter, or running the equivalent work in-house, get started to connect your stack and give the relationship a system to report against.

Frequently asked questions

How much does a growth hacking agency in London cost?

Most London growth hacking and growth marketing agencies work on monthly retainers, typically from around £5,000 to £15,000 a month depending on scope and channels. Some also offer project-based work for a single sprint or campaign, with media spend on paid channels billed separately and paid directly to the ad platforms.

Should I hire a growth hacking agency that specialises in B2B or B2C?

Yes, wherever you can. B2B and B2C growth need different skillsets: B2B usually means longer sales cycles, buying committees and account-based approaches, while B2C is built around volume, creative testing and faster purchase decisions. Check an agency’s specialisms and case studies match your customer type before you brief them.

Should I sign a retainer or run a single project with a growth hacking agency?

If you haven’t worked with an agency before, start with a single project or a short, clearly scoped sprint so you can judge the quality of their thinking and delivery before committing to a longer retainer. Most agencies on this list will scope a smaller first engagement if you ask.

How do I vet a growth hacking agency in London before hiring them?

Ask for references from clients in your sector and at your stage, look at how transparent the agency is about its methodology and reporting, and be wary of anyone promising fast, guaranteed results, since real growth work takes months, not weeks, to compound.