The Complete Guide to Hiring a Klaviyo Email Marketing Agency

If you’re exploring ways to grow your eCommerce brand sustainably, you’ve likely come across Klaviyo. It’s a powerful platform—but tapping into its full potential often requires more than a few pre-built flows.

That’s where a Klaviyo email marketing agency comes in. Not just to plug in campaigns, but to build retention infrastructure that compounds over time. Whether you're just getting started or want to elevate your existing set-up, finding the right partner can be the key to unlocking serious growth.

In this guide, we’ll cover everything you need to know before you hire:

• What Klaviyo agencies do
• Why Klaviyo agencies outperform generalists
• What to expect from their services
• How to choose the agency that fits your needs

Stimulate is a Klaviyo Platinum Partner known for combining lifecycle strategy, copy that converts, and automations that scale. If your goal is long-term customer value, we’re here to help.

What Is a Klaviyo Email Marketing Agency?

A Klaviyo email marketing agency is a retention-focused team of strategists, copywriters, designers, and automation experts who specialize in one thing: helping brands maximize their potential with Klaviyo.

Their job isn’t just to write subject lines or design templates—they build systems. These systems are designed to:

• Capture more leads
• Convert more customers
• Drive repeat purchases
• Increase lifetime value (LTV)

Some of the core Klaviyo agency services include:

• Mapping and deploying lifecycle flows (welcome, post-purchase, winback)
• Creating branded campaigns that align with your goals
• Segmenting lists using behavioral and transactional data
• Monitoring deliverability and fine-tuning performance

More advanced Klaviyo managed services often expand into:

• SMS integration
• Loyalty program communications
• Subscription renewal flows
• Direct mail triggers

The outcome? Higher customer retention, better margins, and fewer gaps in the buyer journey.

Why Hire a Klaviyo Agency (Instead of a Generalist)

Let’s break this down: A generalist agency might “offer email” as part of a broader digital mix. But Klaviyo experts take years to develop. That means:

• Knowing how to design flows based on customer behavior
• Understanding deliverability best practices (which shift constantly)
• Crafting copy that resonates differently in email vs. SMS

When you hire a Klaviyo agency, you’re getting:

• A deep understanding of the platform
• Access to best practices that only certified partners know
• Integrated strategies across multiple owned channels

It’s not just about getting messages out. It’s about sending the right message to the right person at the right time.

The best Klaviyo agencies don’t just run campaigns—they build retention machines.

And with the right partner, you won’t just see better open rates—you’ll see better customers.

What to Expect from a Klaviyo Email Marketing Agency

When you work with a strong Klaviyo partner, your email program becomes a predictable profit-driver. Here’s what full-service Klaviyo agency services often include:

Strategy & Planning

• Lifecycle architecture (pre-purchase, post-purchase, loyalty)
• Testing plans for campaigns and flows
• Customer journey mapping across email, SMS, and loyalty

Creative Execution

• On-brand email design optimized for mobile and desktop
• Compelling copy for different lifecycle stages
• Dynamic content based on browsing or buying behavior

Automation Buildout

• A full library of flows, including:
  • Welcome
  • Cart and checkout abandonment
  • Browse abandonment
  • Post-purchase onboarding
  • Replenishment
  • Winback

Performance Management

• Monthly reports with real metrics (revenue per send, AOV, retention)
• Continuous optimization based on performance data
• Deliverability tracking and list-health improvement

Cross-Channel Retention

• SMS marketing
• Direct mail integration
• Loyalty & subscription communications

Curious how this ties into broader retention? See Stimulate's email marketing services here.

How Much Does It Cost to Hire a Klaviyo Agency?

Pricing for Klaviyo managed services can vary, but here’s what to expect:

• Basic production support: $2,000–$3,500/month
• Full-service execution: $4,000–$6,500/month
• Multi-channel retention support: $5,000–$10,000/month

You might find lower-cost options on freelancer platforms, but they often lack strategic depth and data-driven refinement.

At Stimulate, we build from strategy up. That means:

• You’re not paying for busy work—you’re paying for ROI
• We test before assuming what works
• We evolve your retention ecosystem over time

How to Vet and Choose the Right Klaviyo Agency

If you’re actively looking to hire a Klaviyo agency, here’s what to consider:

Must-Haves

• Klaviyo Partner or Platinum Partner status
• A strategic team of creative directors, strategists, copywriters, and designers (not just project managers)
• Results-driven case studies
• Retention strategy that includes SMS, loyalty, and flows
• Clear deliverables and transparency on performance metrics

Watch Out For:

• Template-only email shops
• No reporting or insight layer
• Lack of creative testing and iteration

A strong Klaviyo agency will help you focus on the metrics that matter most: repeat purchase rate, LTV, and cost to retain—not just opens and clicks.

The right partner becomes an extension of your marketing team. They work with you to test, iterate, and win long-term.

Best Klaviyo Email Marketing Agencies in 2026

We’ve audited dozens of teams. Here are five of the best Klaviyo agencies for different needs:

1. Stimulate (⭐ Best for Lifecycle Strategy & Retention Growth)

• Deep specialization in retention-first growth
• Platinum Klaviyo Partner
• Experts in email, SMS, loyalty, and subscriptions
• Real results: over $100M in client revenue driven

2. Homestead

• Ideal for brands that want media buying + retention in one shop

3. UN/COMMON AGENCY

• Strong design-forward email creative, less strategy-focused

4. Class A Media

• Reliable for technical set-ups and automation-focused execution

5. Underground Ecom

• Budget-friendly option for brands early in their lifecycle

Expected ROI from a Klaviyo Partner

Here’s what top-performing brands are seeing from Klaviyo:

• 20–40% of total store revenue coming from email/SMS
• 3–7x return on managed service investment
• Lower churn rates on subscriptions with better post-purchase flows
• Higher AOV from personalized cross-sells and bundling tactics

At Stimulate, we track everything—from flow performance to campaign lift to engagement over time.

Hire A Klaviyo Agency That Knows Retention

Retention is the only channel you can completely control. When you invest in it, you’re building a moat around your customer base.

The key is finding a partner that understands not just Klaviyo, but how retention drives profitability at scale.

Stimulate’s team of strategists, creatives, and retention operators can help turn your Klaviyo account into a true growth engine.

✅ Ready to work with a Klaviyo Email Marketing Agency that actually moves the needle? Let’s talk.