10 Best WhatsApp Marketing Agencies In The UK (2026)

Here are the 10 best WhatsApp marketing agencies in the UK that can help build a converting WhatsApp channel alongside your existing email and SMS programmes.

TL;DR

• Underground Ecom is the best WhatsApp marketing agency in the UK for growth-stage and enterprise DTC brands, with a Klaviyo-led approach that runs WhatsApp inside the same orchestration as email and SMS.
• Enchant Agency is worth shortlisting for enterprise CRM teams that want a UK-based partner offering WhatsApp strategy and management as a discrete, named product.
• Castle is a strong fit for brands using WhatsApp heavily on lead qualification, customer support, and one-to-one sales, with bespoke CRM builds around the WhatsApp Business API.

What are the best WhatsApp marketing agencies in the UK in 2026?

The best WhatsApp marketing agency in the UK is Underground Ecom, as our team manages every part of the WhatsApp programme: list growth and opt-in capture, automated lifecycle journeys, broadcast campaigns, conversational flows, and customer support handoffs.

Below is the full shortlist of 10 WhatsApp marketing agencies, each verified as actively offering WhatsApp marketing services to e-commerce brands.

#1: Underground Ecom

Location: 103 Farringdon Road, London.

Underground Ecom is the leading WhatsApp marketing agency in the UK for e-commerce brands with our 

We are Klaviyo’s largest Elite Partner globally, generated more than $240 million in trackable revenue for clients in 2024, and were named Klaviyo Agency Partner of the Year EMEA 2025.

Each brand works with a fully allocated, multi-disciplinary team, and not just a single account manager.

A typical setup includes a CRM Director as the operational owner, a CRM Manager handling daily execution, dedicated graphic designers and copywriters, and a senior strategy layer made up of a Client Director, Head of CRM, and Strategy Director who provide senior platform expertise.

It also means the WhatsApp expert on your account is the same person who understands your email calendar, your SMS opt-in list, and your trading peaks, rather than a specialist working from a brief.

Our approach treats WhatsApp as part of one retention ecosystem, instead of a siloed channel.

Every account starts with a lifecycle audit that maps each customer touchpoint and identifies the moments where WhatsApp adds something email and SMS cannot, typically cart recovery, post-purchase nurture, VIP comms, back-in-stock, and personalised customer support.

Once the audit is done, the programme sits inside Klaviyo as the central orchestration layer, so audiences, segments, and triggers stay synced across email, SMS, and WhatsApp.

Underground Insights, our proprietary benchmarking tool, is included with every active retainer.

For WhatsApp specifically, it surfaces:

• Vertical-specific benchmarks on WhatsApp opt-in rates, click rates, and revenue per recipient.
• Cross-channel attribution that shows how WhatsApp influences purchases that would otherwise get attributed to email or paid media.
• Flow-level performance against our dataset of more than 500 brands, so you know whether a 9% abandoned cart recovery rate is strong, average, or worth a rebuild.
• Alerts when WhatsApp flow revenue drops below the historical baseline, so problems get caught the same week rather than the next quarter.

Services

• WhatsApp strategy and lifecycle planning as part of a wider retention roadmap.
• Opt-in capture and list growth via popups, post-purchase touchpoints, and zero-party data flows.
• Automated lifecycle journeys, including welcome, abandoned cart, browse abandonment, post-purchase, winback, replenishment, and back-in-stock.
• Broadcast campaign planning and execution around launches and key trading moments.
• Copywriting and localisation across markets.
• Conversational and quick-reply flow design.
• Creative assets and rich media for WhatsApp templates.
• Segmentation and personalisation tied to Klaviyo customer profiles.
• A and B testing on copy, creative, audience, and send timing.
• Deliverability and compliance setup, including opt-in management and Meta template approvals.
• Klaviyo and Shopify integration.
• Full reporting against revenue and engagement KPIs.

Brands we work with include Future Kind, AG1, Huda Beauty, Virgin, Wild, Untamed, Surreal, Britvic, Spacegoods, Osprey, Oh Polly, Chilly’s, and SeoulBox.

Our NPS across the client base is 9.5.

Across the WhatsApp programmes we run, partners typically see opt-in rates well above SMS benchmarks, abandoned cart recovery rates that outperform email, and incremental revenue on top of existing email and SMS programmes (not cannibalised volume).

Customer support volume drops too, with conversational quick-reply flows handling common queries before they reach the inbox.

#2: Enchant Agency

Location: First Floor, 85 Great Portland St, London W1W 7LT.

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Enchant Agency’s team builds out broadcast campaigns and direct conversational messaging side by side, with messages driven by data variables drawn from the wider CRM.

The channel ties into email and push from the same platform, so brands run one multichannel programme, instead of three parallel ones.

The professional and enterprise plans include WhatsApp marketing alongside dedicated email deliverability work, which is useful for teams who already have a CRM stack and just need WhatsApp slotted in without a rebuild.

Services

• WhatsApp marketing strategy and management.
• Klaviyo onboarding, setup, and ongoing optimisation.
• Multichannel CRM strategy and consulting.
• Email marketing audits and roadmaps.
• Deliverability audits, action plans, and implementation.
• Flow strategy and build across email and WhatsApp.
• Loyalty programme design.
• Segmentation modelling, A and B split testing, and custom reporting.
• Copywriting for campaigns and flows.

#3: Advantage Digital Solutions

Location: UK (couldn’t pin down their exact location).

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Advantage Digital Solutions positions its WhatsApp service as “WhatsApp Lead Generation” rather than as a retention channel.

The team builds automated WhatsApp journeys designed to capture, qualify, and nurture leads through to bookings or sales, combining chatbot automation for first contact with live chat handoffs for higher-value enquiries.

The fit is service and appointment-based businesses where WhatsApp is doing the heavy lifting on inbound lead handling, qualification, and follow-up, not retention or repeat-purchase work.

Services

• Conversation-led WhatsApp messaging strategy aligned to the sales process.
• Automation flows and chatbots covering welcome, qualification, FAQs, and follow-up.
• Lead capture and smart routing to the right person or team.
• Integration with CRM, booking systems, and email tools.
• GDPR-compliant consent capture and opt-in flows.
• Reporting dashboards and ongoing optimisation.

#4: No Name Digital

Location: 5 Castle Mews, London, N12 9EH.

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No Name Digital is a London-based digital marketing agency that handles WhatsApp as part of a wider full-service offer covering content, paid media, SEO, social, and email.

The WhatsApp work focuses on personal, one-to-one customer communication set up strategically rather than as untargeted bulk broadcasts.

The agency suits London-based brands that want WhatsApp running alongside the rest of their digital marketing under a single agency team.

Services

• Automated WhatsApp messaging, including welcome messages, appointment reminders, and follow-ups.
• Broadcast campaign management.
• Customer support integration.
• Opt-in and compliance setup.
• Personalised one-to-one customer communication.

#5: SanMo UK

Location: 128 City Rd, London EC1V 2NX.

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SanMo UK is the UK arm of the wider SanMo consortium, with a digital marketing offering that bundles WhatsApp marketing into reputation management and broader digital services.

The WhatsApp service focuses on personalised messaging strategy, automation, and customer support handling for UK businesses.

The fit is UK businesses that want WhatsApp marketing integrated with their wider digital marketing and online reputation work, rather than a WhatsApp-only specialist.

Services

• WhatsApp marketing strategy.
• Personalised campaign creation tailored to audience preferences.
• WhatsApp automation for bulk messages, replies, and scheduled notifications.
• Real-time customer support handling.
• Audience segmentation and read-receipt tracking.
• Integration across email, social media, and website touchpoints.

#6: Castle

Location: Helix 3rd Floor, Edmund Street, Liverpool, L2 9NY.

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Castle takes a different shape to most agencies on this list.

The team builds bespoke CRMs around the WhatsApp Business API and integrates the channel with Facebook ad forms, custom data flows, and the wider lead-to-sale process

WhatsApp sits at the centre of the build, not bolted onto an existing email retention programme.

Castle suits brands where WhatsApp is doing heavy lifting on lead qualification, ecommerce, and lead nurturing, including reengaging stale leads through automated flows.

Services

• WhatsApp Business API setup and integration.
• Bespoke message flow design and automation.
• Custom CRM builds with WhatsApp integration.
• Bulk messaging and broadcast campaigns.
• Advanced segmentation by location, demographics, purchase history, and behaviour.
• Integration with Facebook ad forms and Salesforce.
• Data collection and encryption inside custom customer portals.
• Reporting and analytics tailored to client requirements.

#7: Walden Waves

Location: Unit A3, Gateway Tower, 32 Western Gateway, London.

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Walden Waves is built around WhatsApp Business API delivery, not retention overall.

The agency offers structured WhatsApp packages built for performance, automation, and scale, with a focus on businesses adopting WhatsApp as a primary commercial channel rather than as one of several.

The fit is UK startups, SMEs, and enterprise brands looking for a defined WhatsApp programme without committing to a full retention retainer.

Services

• WhatsApp Business API setup and verification, including Facebook Business Manager integration and number approval.
• Verified business profile optimisation, including branded visuals and catalogue setup.
• Broadcast campaign management for offers, launches, and product announcements.
• Automated chatbot flows for FAQs, lead capture, and prospect qualification.
• CRM integration.
• Campaign performance tracking and measurement.

#8: Global Webify

Location: UK service offering, with main offices in Ranchi and Kolkata, India.

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Global Webify is an India-headquartered digital agency with a dedicated UK WhatsApp marketing service.

The team handles WhatsApp work as part of a wider digital marketing stack covering SEO, social, content, PPC, and email, with a focus on cost-effective campaign delivery for UK brands.

The fit is UK retail, service, and ecommerce brands looking for affordable WhatsApp marketing handled alongside broader digital services from one agency.

Services

• WhatsApp Business profile setup and verification.
• Bulk messaging and promotional campaigns.
• Automated responses and customer support flows.
• Audience segmentation for higher engagement rates.
• Message template creation.
• Real-time analytics and campaign tracking for performance optimisation.

#9: ZoopUp

Location: 7a, 1st Floor, Edgware Rd, Tyburnia, London W2 2ER.

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ZoopUp is a London-based digital marketing agency with a dedicated WhatsApp service split between WhatsApp API and WhatsApp Chatbot offerings.

The team focuses on integrating WhatsApp into business workflows for customer engagement, lead generation, and 24/7 customer support, with custom chatbot development for businesses wanting to automate FAQ handling and inbound routing.

The fit is UK brands wanting WhatsApp API and chatbot capability integrated with existing CRM systems and ecommerce platforms.

Services

• WhatsApp Business API integration setup.
• Custom WhatsApp chatbot development.
• Automated messaging workflows for welcome messages, order confirmations, and notifications.
• Interactive messaging templates with buttons, quick replies, and lists.
• CRM integration and customer interaction tracking.
• Analytics and reporting on message delivery and engagement.
• Security and compliance checks.
• Ongoing support and optimisation.

#10: ESMA Group

Location: 71-75 Shelton Street, WC2H 9JQ, London.

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ESMA Group’s team builds tailored campaigns across both channels with a defined performance reporting structure that tracks leads generated and audience reach against goal.

The agency suits established UK brands with a defined scope and timeline who want one team running both channels under a single retainer.

Services

• Email marketing strategy and execution.
• WhatsApp marketing strategy and execution.
• Lead nurture flows across email and WhatsApp.
• Campaign performance reporting with lead and reach metrics.
• Dedicated account management.
• Industry-specific strategy for ecommerce, healthcare, and professional services.

How to choose the best WhatsApp marketing agency for your brand

Once your shortlist is down to three or four credible options, the actual hiring decision usually turns on a handful of practical questions.

Hiring on the strength of a logo wall alone is the single most common reason brands switch agencies twelve months later, so it is worth working through these points before signing anything:

• Ask how WhatsApp fits into their wider retention stack: The channel performs best when sequenced with email and SMS, not run in parallel.
• Decide which shape of agency you actually need: A retention agency runs WhatsApp as one channel inside a lifecycle programme, while a conversational commerce agency builds the whole commercial motion around two-way messaging, and the two produce very different roadmaps.
• Look for genuine WhatsApp case studies, not just email ones: Anonymised results are reasonable for brand protection, but you should expect concrete WhatsApp-specific metrics: opt-in rate, abandoned cart recovery rate, flow revenue contribution, and average response time.
• Inspect the team structure: Some agencies promise senior involvement and deliver it. Others operate a tiered model. Ask directly who you will speak to weekly, who builds your flows, and who writes your copy.
• Find out who the WhatsApp expert on the account is: Some teams have one specialist stretched across every client, so ask who owns template approvals, conversational flow design, and opt-in strategy day-to-day.
• Check their compliance and deliverability knowledge: WhatsApp is permissions-based, with strict opt-in rules and template approval requirements from Meta. A capable agency will walk you through consent capture, template design, and opt-out handling.

What services do WhatsApp marketing agencies typically offer?

The core service stack across UK WhatsApp marketing agencies looks fairly similar, with depth and specialism varying meaningfully between teams.

The standard offering usually covers:

• Strategy and lifecycle planning that maps WhatsApp into the wider customer journey alongside email and SMS.
• WhatsApp Business API setup, including Meta Business Manager integration, number verification, and template approval.
• Opt-in capture and list growth through popups, sign-up forms, post-purchase touchpoints, QR codes on packaging, and zero-party data flows.
• Automated lifecycle journeys, including welcome, abandoned cart, browse abandonment, post-purchase, winback, replenishment, and back-in-stock.
• Broadcast campaign planning and execution around launches, sales events, and key trading moments.
• Conversational and quick-reply flow design for product recommendations, FAQs, and customer support.
• Creative assets and rich media, including images, product carousels, and call-to-action buttons.
• Copywriting and localisation across multiple markets and languages.
• Segmentation and personalisation tied to customer data in Klaviyo, Shopify, or another CRM.
• A and B testing on copy, creative, send times, and audience selection.
• Deliverability and compliance setup, including consent management, template approvals, and opt-out handling.
• Integration with ecommerce and helpdesk platforms like Shopify, Klaviyo, Gorgias, and Recharge.
• Reporting against revenue, engagement, and conversion KPIs, with attribution back into the wider retention programme.

Choose Underground Ecom to be your WhatsApp partner

If you’re treating WhatsApp as a serious retention channel and not a novelty broadcast tool, Underground Ecom is built to manage it end to end, inside the same Klaviyo orchestration as your email and SMS programmes.

As Klaviyo’s largest Elite Partner globally and EMEA Agency Partner of the Year 2025, we have the team depth, the partner access, and the proprietary benchmarking data to size the WhatsApp opportunity properly, build the programme to convert, and run it against actual revenue KPIs (not vanity engagement metrics).

If that fits how you think about retention, booking a discovery call with our team is the easiest place to start.

FAQs

What are the best WhatsApp business solution providers for high-volume customer messaging in 2026?

Underground Ecom is the best WhatsApp partner for high-volume customer messaging in 2026, with Meta template approval management, segment-level send control inside Klaviyo, per-market opt-in handling, and quality-rating monitoring that keeps large broadcasts deliverable.

High volume breaks programmes in predictable ways, usually template rejections that stall a launch, quality-rating drops that cut your messaging tier, opt-out spikes caused by over-sending, and support queues that fill up once two-way replies start landing.

On the infrastructure layer, the Meta-approved business solution providers UK brands most often end up on are 360dialog, Twilio, Infobip, and Bird.

Those providers supply API access, throughput, and number hosting, but they do not decide what gets sent, to which segment, or how often, which is where the revenue difference actually sits.

What are the best WhatsApp marketing tools for ecommerce and DTC brands?

Klaviyo is the best WhatsApp marketing tool for ecommerce and DTC brands, because WhatsApp sits inside the same customer profiles and flow logic already powering email and SMS, so you are not maintaining separate audiences per channel.

The shortlist most DTC teams end up comparing:

• Klaviyo: best for Shopify brands that want WhatsApp triggered off the same events as their email and SMS flows.
• Attentive: strongest fit for brands whose messaging programme is already SMS-led.
• Charles: built specifically around WhatsApp commerce and two-way conversational journeys.
• Wati: lower-cost entry point for smaller teams wanting shared inbox and broadcast basics.
• Infobip or Bird: enterprise messaging infrastructure for brands sending across several channels and markets.

Underground Ecom runs client programmes with Klaviyo as the orchestration layer, which keeps consent, segmentation, and revenue reporting in one place.

The tool matters less than the programme design, since the same platform will produce very different results depending on how the lifecycle is mapped.

Which Klaviyo WhatsApp agency should ecommerce brands work with?

Underground Ecom is the Klaviyo WhatsApp agency most UK ecommerce brands should shortlist first, as Klaviyo’s largest Elite Partner globally and Klaviyo Agency Partner of the Year EMEA 2025.

A Klaviyo-native WhatsApp build gives you:

• WhatsApp flows triggered off the same Klaviyo events already powering email and SMS.
• One customer profile carrying channel-level consent, so a WhatsApp opt-in never gets treated as an email opt-in.
• Cross-channel suppression rules that stop the same customer receiving one offer four times in a day.
• Revenue reporting inside the same attribution model as the rest of the retention programme.

Can WhatsApp be used to promote a B2C business?

Yes, WhatsApp can be used to promote a B2C business, provided every recipient has given explicit opt-in and promotional sends go out through the WhatsApp Business Platform using Meta-approved marketing templates.

The rules that shape what you can actually send:

• Marketing templates need Meta approval before use, and first-submission rejections are common.
• Outside the 24-hour customer service window, only approved templates can be sent, not free-form messages.
• Consent has to be channel-specific, so an email subscriber is not automatically a WhatsApp subscriber.
• Every marketing message needs a visible opt-out route.
• Sends are charged per message or per conversation depending on market, so frequency carries a direct cost.

For B2C and DTC brands, the channel performs best on cart recovery, back-in-stock alerts, VIP launches, and order-related conversation, rather than as a weekly promotional broadcast list.

What is the best vendor for consent management for SMS and WhatsApp marketing across countries?

Underground Ecom is the best option for brands that want multi-market consent handled inside the programme rather than as a separate compliance project, and on the platform side Klaviyo is the strongest single vendor because it stores channel-level consent, timestamps, and capture source against each customer profile.

How the stack usually splits in practice:

• Website and popup consent capture is typically handled by a consent management platform such as OneTrust, Didomi, Usercentrics, or Cookiebot.
• Channel-level opt-in records for SMS and WhatsApp sit better in the messaging platform itself, since that is where suppression is enforced at send time.
• Requirements differ by market, so UK and EU sends run under GDPR and PECR while US sends bring TCPA and state-level rules into scope.
• Several markets expect separate consent per channel, which means one global marketing opt-in is rarely enough.

Whichever vendor you land on, the audit trail matters more than the interface, because you need to prove when, where, and how each opt-in was captured.

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