What Should a Shopify Retainer Include? A Month-by-Month Breakdown

You have had the pricing conversation. You know a Shopify retainer costs somewhere between a modest monthly fee and more than you spend on your warehouse. What stalls the decision is a different question: what is actually being delivered each month, and how would you know if you were not getting it?

This article answers that. It draws the line between a support retainer and a growth retainer, breaks the first six months of a proper Shopify agency retainer down month by month, then lists what every retainer should include and what should make you suspicious. If you want the numbers first, read what a Shopify retainer actually costs and come back.

A support retainer and a growth retainer are different products

A support retainer is reactive. Something breaks, a theme update goes wrong, two apps start fighting, and someone fixes it. You are buying availability and peace of mind. That is a legitimate thing to buy, and we cover it in our guide to Shopify support and maintenance for UK businesses.

A growth retainer is proactive. The agency's job is to find what is costing you money and fix it in priority order. Nobody waits for a ticket. The work is driven by evidence from your analytics, session recordings, customer research and test results, and it is measured in revenue rather than hours.

The distinction matters because most Shopify brands with real traffic do not have a traffic problem. They have a conversion problem. Baymard's running average puts cart abandonment at around 70% (updated September 2025), and their 2025 checkout benchmark rated roughly two thirds of ecommerce sites as mediocre or worse on checkout usability. A support retainer will never touch any of that. A growth retainer exists to, through structured conversion rate optimisation.

Month one: make the numbers trustworthy and agree the roadmap

The first month of a Shopify monthly retainer is mostly diagnosis, and a good agency will tell you so up front. Expect a full audit of the store: product pages, collection pages, cart and checkout, site speed, the mobile experience, and the gap between what the analytics say and what customers actually do.

The least glamorous part of month one is usually the most valuable. Tracking on most Shopify stores is partly broken. Events fire twice, consent mode is misconfigured, or Shopify's own reports disagree with GA4 and nobody knows which to believe (we explain why in Shopify Analytics vs GA4). Until the measurement is fixed, every result the retainer produces later is unprovable. So month one sets a baseline you can trust, then turns the audit into a prioritised roadmap, with each item scored on expected revenue impact, confidence in the evidence, and effort to build.

What you should have by the end of month one: a written audit, a baseline report, and a roadmap you can read and argue with. If none of those exist after four weeks, ask why.

Months two and three: the first fixes and the first tests

This is where the retainer starts paying for itself. The top of the roadmap is usually full of things that do not need a test because the evidence is overwhelming: a checkout error on one payment method, a size guide buried three taps deep on mobile, a free shipping threshold nobody can find until the cart. These get built and shipped.

Alongside the quick fixes, the first proper A/B tests go live on the pages with enough traffic to reach a result. Be realistic about win rates. Large datasets published by the major testing platforms suggest that somewhere between one in eight and one in five tests wins on its primary metric. That is not a sign of a bad agency. It is a sign of honest measurement. The value is in the wins compounding, and in the losses that stop you shipping a change that would have hurt.

By the end of month three you should have a short list of shipped changes, each with a before and after, and at least two or three concluded tests. In our experience the early fixes usually cover the cost of the engagement on their own, which is what makes the deeper work in the next quarter possible.

Months four to six: compounding work and the roadmap review

By month four the easy wins are gone and the retainer moves into the work that separates good stores from average ones. Deeper build items: a rebuilt product page template, a new bundling flow, a redesigned navigation, a loyalty or subscription integration. Longer test programmes aimed at the checkout, where Baymard estimates a large ecommerce site can gain around 35% in conversion from design improvements alone. Research that goes beyond analytics, such as post-purchase surveys and recorded sessions, to understand why people leave rather than just where.

Month six is when the roadmap should be reviewed against results, not just refreshed. What was predicted to work, and did it? What was deprioritised, and was that the right call? The reporting at this stage should connect specific pieces of work to specific changes in conversion rate, average order value and revenue per session. A report that lists tasks completed is a timesheet with better formatting.

What every Shopify retainer should include

Whatever you pay, these six things should be in the scope. If any one is missing, you are buying something other than a growth retainer.

Research and evidence. Analytics, session recordings, heatmaps, surveys and customer interviews, feeding every decision.A prioritised roadmap you can see. Not a list of ideas, a ranked backlog with the reasoning visible to you.Real build capacity. Senior developers who can ship the changes, not just recommend them.A testing programme. Hypotheses, test design, statistical thresholds agreed in advance, and a record of what won and what lost.Honest reporting. Results tied to revenue, including the tests that failed and the fixes that made no difference.Named senior people. You should know who is doing the work and be able to talk to them directly.

What should make you suspicious of a Shopify agency retainer

Hour banks that expire. If unused hours vanish at month end, the incentive is to fill them, not to prioritise.An unnamed delivery team. A project manager who relays messages to developers you never meet usually means the work is outsourced or handed to juniors.No measurement plan. If the proposal does not say how results will be measured, there will be no results, only activity.Activity reports. Tickets closed, hours logged, tasks done. None of these are outcomes.Guarantees. Nobody can promise a conversion uplift before seeing your data. A good agency promises a process and reports honestly on what it finds.

The question to ask every month is simple: what changed in revenue, and which piece of work changed it? If the report cannot answer that, it is a timesheet.

Realistic UK prices and what changes at each level

UK Shopify retainers broadly sit in three bands. A freelancer or small studio at £1,200 to £3,500 a month buys a block of hours, typically 15 to 30, and is reactive by nature. A proper agency growth retainer in the UK runs £2,500 to £8,000 a month. At that level you should expect everything in the list above, and the difference between the bottom and the top of the range is how much testing and build capacity is included. Above £15,000 a month you are into enterprise territory: headless builds, international expansion and high-volume testing programmes across several markets.

What changes as you move up is not the number of hours. It is the seniority of the people, the depth of the research, and how much of the roadmap gets built rather than recommended. A cheap retainer that recommends ten things and ships two is more expensive than it looks.

Our own Conversion Growth Retainer is built on the structure above. It is a senior team in Glasgow, no juniors and no outsourcing, working with Shopify brands across Scotland, the UK and internationally. It runs month to month, because the work should be earning its place every month. After 12 years and more than 100 projects, that structure is what we have found works.

The takeaway

Ask any agency pitching you a retainer to walk you through their first six months. If the answer is vague, or if it leads with hours rather than a baseline and a roadmap, you are being sold support dressed as growth. If it leads with measurement, prioritisation and named people, you are probably in good hands.

If you want a second opinion on whether a retainer is the right next step for your store, or you already have one and are not sure what you are getting for it, get in touch. We will tell you straight, including if the honest answer is that you do not need one yet.