Shopify agency retainers: what you get at $5k, $15k, and $40k a month (2026)

Most published agency pricing pages hide the number or describe hours. Buyers do not buy hours. They buy who owns the store after the launch party.

This is the scope you should expect at three price points, and what is missing if a proposal is cheaper.

Partnerships start at $5,000 a month. Saying so here saves both sides a call. $15k and $40k are not upgrades you get upsold into on week two. They are what the work looks like when the constraint is bigger than one workstream. If the leak is real and the fee is not the right fee, we will say that on the Growth Review and point you at who is.

Key takeaways

• A Shopify agency retainer is a monthly fee for ongoing commerce work. It is not a build, not media spend, and not your app stack.
• $5,000/month buys one primary workstream with a senior operator and a clear monthly output. It does not buy a full team.
• $15,000/month buys a small integrated team: storefront + CRO + Klaviyo, or growth + creative, with a weekly cadence and a 90-day plan.
• $40,000/month buys an embedded commerce pod: design, Shopify / Plus engineering, lifecycle, acquisition, and a named lead who owns revenue, not tickets.
• Market floor for real growth work in the US is roughly $4,000–$6,000/month. Below that you are buying maintenance, a freelancer, or a ticket queue.
• Propeller’s published floor is $5,000/month. That is a real engagement, not a teaser. 90-day blocks start at $15,000. Builds and migrations are scoped separately.
• If $5k is the wrong size for the leak, too big or too small, the Growth Review is the place to say so. It is free, and it is allowed to end in a referral.

Shopify agency retainer cost in 2026, at a glance

• $5,000/month: one owned workstream. Roughly 20–30 senior hours or a defined sprint. Best-fit revenue about $2M–$8M. One lead plus specialist support.
• $15,000/month: integrated growth partner. Small pod, weekly cadence. Best-fit revenue about $5M–$25M. Strategist + CRO/dev + lifecycle.
• $40,000/month: embedded commerce team. Dedicated capacity across disciplines. Best-fit revenue about $15M–$100M+. Named lead + design + eng + growth.

Read those rows left to right. Most brands that should hire an agency belong in the first row. The third row is an embedded team for a store that already has one.

These are US boutique-to-mid agency rates for Shopify and Shopify Plus brands. Offshore ticket retainers and “unlimited tasks” products sit lower and produce different work. Enterprise holding-company retainers sit higher and include layers you will never meet.

What a Shopify agency retainer is (and is not)

A retainer is the fee for the team that stays on after launch.

It usually covers some mix of storefront iteration (theme, Liquid, Checkout Extensibility, Hydrogen), conversion rate optimization and testing, technical and collection SEO, Klaviyo / SMS lifecycle, paid social and search management (not the media), analytics, CAPI, and reporting, plus app and integration hygiene.

It does not cover Shopify plan fees (Basic through Plus), app subscriptions (Klaviyo, reviews, subscriptions, search), media spend on Meta, Google, or TikTok, a new store build, Plus replatform, or Hydrogen rebuild, photography, brand identity, or packaging, or your ERP, 3PL, or OMS licence.

If a proposal mixes those line items into one number, ask them to split it. Mixed numbers are how retainers become impossible to compare.

$5,000 a month: one constraint, owned

What $5k is for. This is the door. A brand that already has traffic, a working store, and one bottleneck that is costing more than the fee. Not a rebuild. Not “do our marketing.” Not a lesser version of the $15k retainer. It is one constraint, owned properly.

What you should get: a named senior owner (CRO, lifecycle, or Shopify engineering, pick one), a 30-day diagnosis with the leak priced in revenue, one primary workstream for the quarter, a monthly change log of what shipped and what it did to conversion, AOV, or retained revenue, and access for questions, not a Slack full of juniors.

On a CRO-shaped $5k retainer that looks like funnel instrumentation (checkout, PDP, collection), two to four implemented tests or UX fixes a month (not a PDF of recommendations), and a stop-doing list for pages and apps that tax speed or conversion.

On a Klaviyo-shaped $5k retainer: audit of flows that actually print money (abandoned checkout, post-purchase, winback, replenishment), rebuild of two or three core flows, campaign cadence and offer logic, and deliverability hygiene.

On a storefront-shaped $5k retainer: theme performance (LCP, INP, app bloat), PDP and collection iteration, a small backlog of Liquid / Functions work, and no net-new custom app.

What you do not get at $5k: a designer, a developer, and a media buyer on the same account; a new visual identity; paid media management and email and CRO; same-week custom feature work on demand; or a second market, a second brand, or a Hydrogen programme.

Who it fits. Shopify or Plus brands doing roughly $2M–$8M, with paid traffic already arriving, and a founder or ecommerce lead who can make decisions without a committee. Propeller’s partnerships start here for that reason. Saying the number up front saves both sides a call.

Red flag at this price: “full-service marketing” inside $5k. That is a generalist with a Canva login. Full-service at this fee means nothing is owned.

$15,000 a month: the growth partner

This is the first price where an agency can run more than one surface of the store without lying.

What $15k is for. The brand is past “fix the PDP.” Acquisition, the site, and lifecycle are arguing with each other. Someone needs to own the system for a quarter and prove a number.

• A weekly working cadence, not a monthly recap deck
• Two or three disciplines on one plan: typically storefront + CRO + Klaviyo, or CRO + lifecycle + light acquisition creative
• A 90-day thesis: the constraint, the revenue at stake, the tests, the kill criteria
• Implemented work. Recommendations without a ship date are not a retainer.
• Senior review on every release that can touch checkout or tracking
• A shared dashboard: sessions, CVR, AOV, contribution after discounts, flow revenue, blended CAC if ads are in scope

A 90-day block at this level is how serious shops start. Propeller publishes 90-day engagements from $15,000 for the same reason. Ninety days is long enough to ship, measure, and decide whether to continue. It is short enough that nobody hides inside a 12-month PDF.

What a $15k month looks like in practice. Week 1–2: instrumentation, speed, tracking, offer and PDP diagnosis. Week 3–8: two workstreams in parallel, for example collection/PDP conversion and the four Klaviyo flows that should already be paying rent. Week 9–12: keep what moved, kill what did not, write the next quarter against the new baseline.

What you still do not get: a net-new Plus build or Hydrogen storefront (those are $200k–$500k projects, not a month of retainer), always-on multi-channel media at real spend plus creative production plus the site, a dedicated designer five days a week, or International Markets rollout across five countries.

Who it fits. Brands doing roughly $5M–$25M, or a $3M brand growing fast enough that the site and lifecycle are now the constraint on paid spend. Someone on the client side has to be able to approve tests in days, not sprint cycles.

Red flag at this price: forty hours of a mid-level generalist, rebadged as a “pod.” Ask for names, disciplines, and last-quarter output on a comparable store.

$40,000 a month: an embedded commerce team

Most readers can skip this section. $40k is not the “real” retainer with $5k as the brochure. It is what the work costs when you need a small in-house team and you would rather rent one than hire five people.

At this level you are not buying a vendor. You are renting capacity: design, Shopify / Plus engineering, lifecycle, and a named lead, without the hiring lag.

What $40k is for. Shopify Plus brands where the storefront, checkout, data, lifecycle, and acquisition have to move as one system. Multi-market. Custom apps. Checkout Extensibility. A creative system that feeds paid. A roadmap that survives Black Friday.

• A named lead who owns the revenue number, not the ticket queue
• Dedicated design and Shopify / Plus engineering capacity
• Lifecycle (Klaviyo or equivalent) run as a profit centre, not a newsletter
• Acquisition management or a tight interface with the media team you already have
• Roadmap across quarters: checkout, PDP architecture, Markets, subscriptions, wholesale / B2B, Hydrogen only if the brief actually needs it
• Production quality that matches a brand selling culture, not a theme shop
• Incident response when a release, app, or campaign hits the store
• Reporting a CFO can read: contribution, not “engagement”

This is also where retainers absorb work that would otherwise become a string of $20k change orders: checkout upgrades, catalog architecture, app replacements, landing systems for paid, subscription logic.

What you still pay extra for: a full replatform or headless rebuild, brand identity, media spend, net-new custom applications with their own product cycle, and photography and content studios.

Who it fits. Roughly $15M–$100M+, often Plus, often more than one market or channel (DTC + retail + marketplace). The internal team is strong but incomplete. They need a studio that can design, ship, and measure on the same week.

Red flag at this price: a big logo on the deck and juniors on the Slack. At $40k you should know the names of the people who will touch checkout.

Which tier matches your revenue

• Under $1M: usually none, or a specialist freelancer. Full-service retainers eat margin before the store has a system.
• $1M–$3M: $3k–$6k specialist, or a 90-day sprint. Buy one constraint: CRO or Klaviyo or the theme.
• $2M–$8M: $5k floor for a real agency. Matches Propeller’s published starting partnership.
• $5M–$25M: $15k or a $15k / 90-day block. Site, lifecycle, and acquisition need one owner.
• $15M–$100M+: $15k–$40k+. Plus complexity, multi-market, custom stack.

A useful rule: the retainer should be a fraction of the leak it is hired to close. If a store doing $10M at a 1.6% conversion rate can get to 2.1% without buying more traffic, that lift is worth more than a year of $15k. If nobody will do that math on the first call, find another shop.

If you are under $2M and the constraint is still “we need a store that works,” a retainer is usually the wrong product. A scoped build or a specialist freelancer will waste less money. That is not a polite no. It is the same honesty this page is for.

What blows a Shopify retainer over budget

• Headless / Hydrogen when Online Store 2.0 would do. Hydrogen is a product decision. It is not a retainer add-on.
• Broken tracking. If Meta CAPI, Google, and Shopify disagree, the first month is plumbing. Budget it.
• App sprawl. Twenty apps and a 4-second LCP means the first sprint is subtraction.
• Catalog debt. 8,000 SKUs with empty metafields cannot be “SEOed” inside a growth retainer.
• No decision-maker. Retainers die in review loops, not in Figma.
• Paid media without a store that converts. Buying more sessions into a 1.1% mobile PDP is how retainers look expensive.
• Scope written as hours. Hours reward activity. Revenue rewards shipped constraints.

How to read a Shopify agency retainer proposal

Ask for these eight lines. If they are missing, the number is not real.

• The constraint. One sentence. “Mobile PDP conversion on the hero collection,” not “holistic growth.”
• The owners. Names and disciplines, not departments.
• What ships in day 30, 60, 90. Artefacts, not ceremonies.
• What is out of scope. Builds, media spend, apps, brand, other markets.
• How success is measured. CVR, AOV, contribution, flow revenue, speed. Not impressions.
• Who writes code that can break checkout. Senior, in-house, or a nameless bench.
• The kill switch. How either side stops at day 90 without theatre.
• The number in writing. Monthly fee. Start date. Notice period.

Compare that list to how to choose a Shopify agency. Pretty decks are cheap. Outcome ownership is not.

What Propeller publishes, so this page is not a tease

Propeller is a Santa Monica Shopify and ecommerce studio. The commercial numbers already on the site: partnerships from $5,000/month, 90-day engagements from $15,000, standard Shopify builds $100k–$150k, Shopify Plus implementations $250k–$500k+, Hydrogen storefronts $200k–$400k+, and migrations $75k–$200k.

Retainers here are built as integrated ownership: the people who touch the storefront stay on to test it. No ticket-queue retainer. No “we ship it and you hire a CRO agency.”

The $5,000 floor is the starting partnership, not a bait number. Most engagements that should exist start there, or as a 90-day block at $15,000 so both sides can keep or kill with evidence.

If the store is leaking more than the fee, the next step is a Growth Review: thirty minutes, work done before the call, no deck. If we are not the right partner we will say that, and point you at who is. No obligation to retain.

Get a Growth Review · Shopify agency · Ecommerce CRO

Shopify agency retainer vs hiring in-house

• Retainer at $15k/mo: about $180,000 a year. Coverage is strategist + specialist + shipping capacity. Ramp in days. Bench when someone is out. Best when workload is spiky and the stack is mixed.
• One senior Shopify hire: $180k–$250k fully loaded in US coastal markets. One discipline, one person. Ramp 3–6 months. When someone is out, you are the coverage. Best when you have a clear single seat and a manager.

Hire in-house when the work is one seat, five days a week, forever. Retain the studio when the work is a system: design, Liquid, checkout, Klaviyo, and the test calendar have to move together.