Klaviyo runs email, SMS, reviews, forms and predictive segmentation for Shopify stores, and it's the highest-leverage app in most DTC stacks โ contributing 25-40% of total revenue for mature brands. Bad Klaviyo work costs more than skipping it: broken flows send discount codes to the wrong lifecycle stage, poor segmentation burns sending reputation, and missed abandoned cart automation leaves 5-10% of monthly revenue unclaimed.
Work through these steps before requesting quotes.
Define what stage you're at. "Set up Klaviyo" means one thing for a store that just installed it and another for a store with fifteen flows needing optimisation. "Install Klaviyo, build the core five flows, and set up three baseline segments with GDPR-compliant consent capture" produces comparable quotes. Include monthly email revenue, list size, current ESP if migrating, and any SMS goals.
Match the specialist to the project. Freelance consultants (ยฃ60-ยฃ140/hour) fit stores under ยฃ1.5M annual revenue and defined project work. Boutique agencies (ยฃ2,500-ยฃ8,000/month) fit stores ยฃ1.5M-ยฃ12M where email and SMS are a full workstream. Klaviyo Platinum or Master Partners (ยฃ5,000-ยฃ20,000+/month) fit stores past ยฃ12M where email drives significant revenue.
Verify Partner tier and GDPR experience. Klaviyo ranks agency partners Bronze, Silver, Gold and Platinum, with Master as a separate individual certification. Check claimed tiers in the Klaviyo Partner Directory. Separately, ask how they handle consent capture in forms and flows โ UK PECR rules add requirements around soft opt-in that US-focused consultants routinely miss.
Ask for attribution screenshots, not case study decks. "We built flows for a brand like yours" is not evidence. Attributed email revenue moving from 18% to 32% of total, with dates, from a real Klaviyo dashboard, is. Ask for three.
Get the deliverable list in writing. A good retainer names what ships each month: flows built or optimised, campaigns sent, tests run, segments created, reporting cadence. "Monthly Klaviyo management" with no deliverable list is billing for presence, not output.