Looking for the best Klaviyo agency in the UK? The right choice depends on your ecommerce platform, budget, in-house team and what needs fixing. This guide compares seven UK-focused agencies by partner credentials, public client evidence, areas of specialism and commercial fit.
7 UK Klaviyo Agencies Compared
This is an editorial shortlist, ordered with Sendfluence first, not a claim that every agency has been evaluated through the same private client data. Partner tiers are from Klaviyo’s public directory where available; other positioning reflects each agency’s published services.
| Agency | Public Partner Status | Best-Fit Specialism | Pricing Visibility |
|---|---|---|---|
| 1. Sendfluence | Official Klaviyo Partner | Flexible, performance-led email and SMS | Fixed fees from £1,000/month |
| 2. Underground Ecom | Elite Master | Established DTC retention programmes | Request a current quote |
| 3. PAASE | Elite Master | Data-led segmentation and personalisation | Request a current quote |
| 4. Enchant Agency | Platinum Master | Complex CRM and automation | Request a current quote |
| 5. Magnet Monster | Platinum Master | Creative-led retention marketing | Request a current quote |
| 6. Get Better | Elite Master | Technical Klaviyo optimisation | Request a current quote |
| 7. Swanky | Platinum Master | Shopify Plus and Klaviyo integrations | Request a current quote |
“Request a current quote” means we have not verified a comparable publicly listed ongoing package for that agency here. It does not mean the agency never publishes prices. Subscription and project charges may be separate.
How We Selected These Agencies
We prioritised agencies with a clear UK connection, meaningful Klaviyo services, credible public evidence and a distinguishable use case. We reviewed:
- Partner credentials: Current status on Klaviyo’s official directory, rather than relying solely on website badges.
- Relevant services: Email and SMS strategy, flows, segmentation, creative, data and technical integrations.
- Public evidence: Named case studies, client work, platform recognition or independently published examples.
- Commercial fit: Whether the agency suits a growing brand, established DTC business or complex Shopify Plus operation.
- Transparency: Published prices when available and questions buyers should ask where information is not public.
Partner tiers are useful indicators of platform relationship and scale, but they do not guarantee results or determine which team will be right for your account. We did not conduct secret-shopper calls, audit the agencies’ private client accounts or independently validate reported revenue outcomes.
The 7 Klaviyo Agencies to Consider in 2026
Sendfluence
Flexible, performance-led email and SMS management
Sendfluence is a UK email and CRM agency for ecommerce brands that want lifecycle marketing tied to commercial outcomes. Its services cover Klaviyo setup and migration, automated flows, campaign strategy, segmentation, email design, SMS and ongoing optimisation. The agency describes its approach as senior-led, with flexible engagements and a combination of fixed and performance-linked fees.
Unlike many agencies that only provide pricing after a discovery call, Sendfluence states that its fixed fees start at £1,000 per month. It also offers no long-term contracts. The exact scope, any variable fee and measurement methodology should be agreed before signing.
Its published God Save Queens case study reports an 83% increase in email marketing revenue following work on flows, campaigns and segmentation. This is a company-reported result, not a promised outcome for other clients.
Question worth asking: Which deliverables fit within the £1,000 starting fee, and how is any performance-linked component calculated?
Check the evidence: Sendfluence Klaviyo Services | God Save Queens Case Study
A sample of our work
LOVE CORN
Email Strategy · Campaigns · Design · Klaviyo
View work ↗
CleanCo
Campaigns · Design · Lifecycle · CRM
View work ↗
David Gandy Wellwear
Email Strategy · Campaigns · Design · Lifecycle
View work ↗
Dr Sebagh
Campaigns · Design · CRM
View work ↗
FLOC Brewing
Email Strategy · Campaigns · Automation
View work ↗
OceanSaver
Campaigns · Design · Retention
View work ↗Underground Ecom
Large and fast-growing DTC retention programmes
Underground Ecom is a UK retention specialist whose Klaviyo partner listing covers email and mobile messaging, segmentation, testing, technical support and analytics. It lists experience with brands including Virgin, Huda Beauty and Simba Sleep. Klaviyo also named Underground Ecom among its 2025 EMEA agency partners of the year.
Its public service profile spans multiple ecommerce platforms and significant client revenue bands, making it a particularly relevant option for brands with established operations, complex lifecycle requirements or international growth plans.
The agency also advertises a commission-based engagement for qualifying brands, alongside standard retainers and hybrid arrangements. Buyers should compare the commercial terms carefully rather than assume the same model is available to every account.
Question worth asking: Confirm minimum engagement, dedicated account staffing, deliverables and eligibility for any commission-based offer.
Check the evidence: Official Klaviyo Profile | 2025 Klaviyo Award
PAASE
Advanced segmentation, personalisation and data-led CRM
PAASE is a UK-headquartered email and retention agency with Klaviyo Elite Master status. Its services and case studies emphasise data quality, audience understanding, migration, automation and personalised customer journeys rather than relying on repeated broadcast promotions.
Published work includes Sophie Allport, where the agency describes a programme involving platform migration, engagement segmentation and improved automation. PAASE also publishes examples involving AI-driven personalisation for brands such as Curlsmith.
That combination makes PAASE worth considering when a brand has an established customer database but needs more sophisticated segmentation, measurement and lifecycle strategy.
Question worth asking: Ask which personalisation capabilities are native to Klaviyo, what requires extra software and how uplift is measured.
Check the evidence: Official Klaviyo Profile | PAASE Case Studies
Enchant Agency
Complex CRM strategy, automation and reporting
Enchant is a London-based lifecycle marketing and eCRM agency working across onboarding, deliverability, flows, segmentation, technical integrations, reporting, design and cross-channel customer communications. Its breadth may be valuable for businesses that need broader CRM consultancy rather than campaign production alone.
Klaviyo named Enchant its EMEA UK & Ireland Partner of the Year for 2026. The public Klaviyo directory lists it as a Platinum Master partner, and its agency profile highlights work for brands including QVC, Sealskinz and Cox & Cox.
Enchant is particularly worth comparing if customer data, complex automation or reporting requirements are as important as email creative and campaign frequency.
Question worth asking: Establish how much of the proposal focuses on Klaviyo versus other CRM platforms and who will own execution.
Check the evidence: Official Klaviyo Profile | 2026 Klaviyo Awards
Magnet Monster
Brand-led retention beyond constant discounting
Magnet Monster positions itself as a retention specialist that helps ecommerce businesses move beyond a constant cycle of promotional discounts. Its Klaviyo profile emphasises brand-led content, customer insight, zero-party data and profitability-conscious strategy.
The agency says it has worked with more than 300 DTC brands, and its public profile names Waterdrop, Wild and Laura Geller among its experience. It combines email with other retention channels and content-led customer engagement.
For a brand that already sends frequently but struggles to build distinctive communication, Magnet Monster offers a different angle from simply increasing campaign volume.
Question worth asking: Request examples in your product category and clarify the planned split between strategy, creative and operational delivery.
Check the evidence: Official Klaviyo Profile
Get Better
Audit-first technical and full-platform Klaviyo optimisation
Get Better is a Devon-based Klaviyo specialist with Elite Master status. Its partner profile describes audit-led onboarding, automation, CRM strategy, data, analytics, migrations and multichannel programmes that include email and mobile messaging.
Klaviyo has published a dedicated case study about Get Better, highlighting its account-audit approach and expansion into advanced platform capabilities. This gives prospective clients an additional source beyond the agency’s own marketing pages.
It is an attractive option for brands that suspect tracking, integration, flow architecture or customer data is holding back performance and want a structured technical assessment before committing to a programme.
Question worth asking: Clarify whether the initial audit is separate from implementation and how improvements will be prioritised.
Check the evidence: Official Klaviyo Profile | Klaviyo Case Study
Swanky
Shopify Plus and Klaviyo across the ecommerce stack
Swanky is a broader ecommerce agency with UK operations and significant Shopify Plus expertise. It provides ecommerce development and growth services alongside Klaviyo migrations, audits, automated flows, template design, campaigns, segmentation and reporting.
Its official Klaviyo listing identifies Platinum Master status and Shopify Plus expertise. That positioning is relevant when retention marketing cannot be separated from a major Shopify rebuild, customer experience project or wider technology integration.
Swanky may be more suitable than a narrowly focused email agency for brands seeking one partner across commerce infrastructure and CRM, although companies that only need campaign management should compare scope and cost closely.
Question worth asking: Confirm whether Klaviyo is handled by a dedicated CRM team and whether other ecommerce work is included in the fee.
Check the evidence: Official Klaviyo Profile | Swanky Technology Partnerships
Which Klaviyo Agency Is Right for Your Business?
No single agency is the best match for every ecommerce business. Start with your most important requirement and use these suggestions to create a shortlist.
I need flexible fees and commercial accountability
Start with Sendfluence. Its published entry-level fixed fee and flexible commercial approach make it easy to start a transparent fee discussion. Compare deliverables against other quotes.
I have a large DTC account or an international team
Compare Underground Ecom for established retention programmes and PAASE for advanced customer-data personalisation.
I need complex CRM architecture or a detailed audit
Compare Enchant for broader CRM requirements and Get Better for technical Klaviyo auditing and optimisation.
I need creative retention or Shopify Plus integration
Consider Magnet Monster for brand-led lifecycle marketing and Swanky where Klaviyo forms part of a wider Shopify Plus programme.
These are qualitative editorial suggestions, not automatic rankings or performance predictions. Ask at least two providers for a scope and commercial proposal.
How Much Does a Klaviyo Agency Cost in the UK?
The quoted fee depends on account complexity, campaign volume, automation needs, integrations and the level of strategic support. You may be comparing fixed retainers, one-off projects, performance-based arrangements or a hybrid of these.
At Sendfluence, fixed fees start from £1,000 per month, with no long-term contracts and the option for fixed plus performance-linked structures. That is Sendfluence’s starting point, not a claim about the market average. It does not necessarily include platform subscriptions, additional projects or every service in this article.
Other providers may quote after reviewing your account. Ask every agency for the same scope: number of monthly campaigns, core flows, copy, design, segmentation, reporting, software charges, setup fees, notice periods and deliverables. A low headline price is not meaningful without knowing what it buys.
For price examples, fee structures and the financial break-even test, read our UK Klaviyo agency pricing guide and ROI calculator .
Seven Questions to Ask Before Hiring a Klaviyo Agency
- Who will actually work on our account? Ask to meet the strategist and the person building flows and campaigns.
- Which outcomes matter? Separate Klaviyo-attributed revenue from genuinely incremental revenue, retention and contribution profit.
- What is included in the fee? Confirm monthly sends, templates, design, copy, flows, tests, SMS and reporting.
- Can you show relevant client evidence? Choose case studies with comparable product categories and business maturity; request context for percentage claims.
- What does the first 90 days look like? Look for an audit, priority roadmap, clearly scoped execution and review cadence.
- Who owns our account and assets? Check Klaviyo account access, campaign creative, templates, data, intellectual property and exportability.
- What are the contract and performance-fee terms? Agree baseline definitions, attribution methods, notice periods and treatment of one-off promotions.
If you’re comparing outsourcing with recruitment, read our Klaviyo agency vs in-house comparison before deciding.
FAQs About Choosing a Klaviyo Agency
Which is the best Klaviyo agency in the UK?
There is no single best agency for every ecommerce brand. Sendfluence is our featured first choice for businesses looking for flexible, performance-led support with fixed fees starting at £1,000 per month. Underground Ecom, PAASE and Get Better hold Elite Master status in Klaviyo’s public directory; Enchant won Klaviyo’s 2026 EMEA UK & Ireland partner award. Your best fit depends on budget, account complexity and the type of work required.
How do I compare Klaviyo agency prices fairly?
Ask each provider to quote for the same monthly campaign volume, flow development, copywriting, design, reporting and account management. Clarify whether Klaviyo subscription costs, SMS charges and one-off migration work are excluded. Where performance fees apply, agree how incremental results and attribution will be measured.
Does a higher Klaviyo partner tier mean better results?
Not automatically. A higher tier signals a substantial platform relationship, but it cannot tell you whether your account will receive senior attention, strong creative or a commercially sensible scope. Verify the current badge in Klaviyo’s official partner directory and compare case studies and the delivery team.
Should I choose a Klaviyo agency based in the UK?
A UK-based agency can be helpful for time-zone alignment, seasonal trading calendars and familiarity with UK marketing rules. However, delivery capability, product knowledge, communication and relevant experience usually matter more than postcode alone. Make sure your provider understands consent, data protection and your ecommerce markets.
Can a Klaviyo agency help with Shopify?
Yes. Many of the agencies here support Shopify or Shopify Plus, including integrations, customer data, checkout and browse events, automated flows and segmentation. If your requirements include replatforming or significant ecommerce development, a broader Shopify Plus specialist such as Swanky may warrant particular consideration.
What should a Klaviyo agency report on?
Useful reporting goes beyond open rates. Ask for revenue per recipient, flow and campaign performance, deliverability, repeat purchase behaviour and customer retention, interpreted alongside store-wide sales and profitability. Revenue attributed to Klaviyo does not automatically equal additional revenue caused by the agency’s work.
If you are considering Klaviyo support for your ecommerce brand, explore Sendfluence’s Klaviyo agency services or speak to our team about your requirements.
Further Klaviyo Reading
- Klaviyo Agency Pricing UK + ROI Calculator
- Klaviyo Agency vs In-House
- What Is Klaviyo?
- Klaviyo vs Mailchimp for Ecommerce
- The Essential Klaviyo Flows for Ecommerce
Source approach: Agency capabilities and partner tiers were checked using the public Klaviyo partner directory and provider websites, with supporting links in each profile. Awards were checked against Klaviyo’s own announcements. Client outcomes are reported by their respective agencies unless otherwise indicated. Last checked: 10 November 2026.
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