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Part of How UK retailers can choose ecommerce marketing agencies
How UK retailers can choose ecommerce marketing agencies
How UK retailers can choose ecommerce marketing agencies: platform checks for Shopify and Amazon, fee models, paid trial briefs, red flags and contract questions.
What to take away
- Ecommerce agencies tie ad spend to contribution margin, not just revenue.
- Compare named UK agencies such as Swanky, We Make Websites and Venture Stream.
- Prioritise Shopify Plus and Amazon UK proof, plus feed, conversion and retention skills.
- Ask for a paid trial brief with a fixed scope before a retainer.
- Check data, VAT and advertising compliance before sharing customer lists.
Start with your trading model, not an agency logo
Ecommerce businesses do not buy the same marketing. A Shopify own-brand store needs different work from an Amazon UK seller. A subscription brand needs retention marketing. Write down channel mix, average order value and margin before you shortlist.
Match the shortlist to your platform and stage. If Shopify drives revenue, compare Shopify Plus partners such as Swanky, We Make Websites and Eastside Co. These agencies publicly list Shopify builds, migrations and conversion work. If Amazon UK drives volume, check Seller Central, A+ content and Amazon Ads experience.
ONS business services data covers the sector, but it will not reveal which agency understands Shopify checkout. ONS link
What a strong ecommerce agency should show
- Platform proofShopify, WooCommerce, BigCommerce or Amazon UK case work with named results.
- Performance marketing for online stores UKGoogle Shopping, Meta, TikTok and Amazon Ads managed to a margin target.
- Conversion workproduct pages, checkout, bundles and email flows.
- MeasurementGA4, server-side tracking, blended CAC and contribution margin.
Ask for evidence, not adjectives. A useful case study names the platform, period and metric. It explains what the agency controlled. If the client handled pricing or stock, say so.
Compare specialist performance agencies too. Journey Further, Impression and Mediaworks publish ecommerce and retail case studies. Their fees are usually retainer or project based, quoted on scope. Venture Stream is a Shopify Plus partner and Google Premier Partner in Newcastle.
The CAP Code sets ad rules, and the ASA publishes the codes your agency should know. ASA link
Compare fee models before you brief
| Fee model | Best for | Illustrative monthly cost | Watch point | | Retainer | Continuous trading | £2,500 to £8,000 | Scope creep | | Project | Site, feed or checkout rebuild | £4,000 to £15,000 | Handover | | Media only | In-house team | 10% to 15% of ad spend | Incentive | | Performance | Mature profit tracking | Base fee plus profit share | Attribution |
Illustrative bands only, not market data.
Ecommerce agency fee models compared
Retainer
- Best for
- Continuous trading
- Monthly cost
- £2,500 to £8,000
- Watch point
- Scope creep
Project
- Best for
- Site or feed rebuild
- Monthly cost
- £4,000 to £15,000
- Watch point
- Handover
Media only
- Best for
- In-house team
- Monthly cost
- 10% to 15% of ad spend
- Watch point
- Incentive
Performance
- Best for
- Mature profit tracking
- Monthly cost
- Base fee plus profit share
- Watch point
- Attribution
Retainers suit continuous trading. Project fees suit replatforming, feed fixes or a conversion sprint. Media-only fees can work with an in-house team. Performance deals need clean profit data.
Before comparing quotes, read what UK businesses pay in marketing agency retainer fees, then map each proposal to the same scope.
Run a paid trial brief
- Give the agency a two-week paid brief on one product category.
- Share read-only access, not admin keys.
- Agree the metriccontribution margin, ROAS after returns, or new customer CAC.
- Review the work in a live call and ask who did it.
- Check reporting, handover and notice terms.
A trial brief exposes speed, communication and platform skill. It shows whether the agency asks about stock, delivery promises and returns. Those details affect ad performance more than a new creative style.
Run a two-week paid trial brief
- Give a two-week paid brief on one product category
- Share read-only access, not admin keys
- Agree metriccontribution margin, ROAS after returns, or new customer CAC
- Review work in a live call and ask who did it
- Check reporting, handover and notice terms
Use our questions to ask a marketing agency list to test answers on fees and ownership.
If the agency handles customer data, the ICO guide explains controller and processor duties. ICO link
Platform skills to test: Shopify and Amazon UK
Shopify work is not one skill. Liquid edits, app selection, checkout speed and feeds all matter. Ask which Shopify Plus features the team used last year. For Amazon UK, ask about Brand Registry, A+ content and Sponsored Brands.
Amazon sellers often need retail readiness before ads. Poor images or stock gaps waste media spend. A good agency will fix the listing or tell you to wait.
Red flags in ecommerce agency pitches
- Guaranteed ROAS without margin or returns data.
- No named platform specialist on the pitch call.
- Case studies with no dates, platform or baseline.
- Long notice periods and agency-owned ad accounts.
- Fees based on ad spend when profit is the goal.
A pitch should include a measurement plan. It should say what will be tracked, how returns are handled and who owns the ad account. If the agency cannot explain attribution, it will struggle with yours.
Red flags in ecommerce agency pitches
- Guaranteed ROAS without margin or returns data
- No named platform specialist on the pitch call
- Case studies with no dates, platform or baseline
- Long notice periods and agency-owned ad accounts
- Fees based on ad spend when profit is the goal
Common questions
How much do ecommerce marketing agencies charge in the UK?
Illustrative retainers often sit between £2,500 and £8,000 a month, but scope drives the number. Media-only fees are usually a percentage of ad spend. Ask for a fixed scope and a 30-day exit.
Do I need a Shopify marketing agency or a general agency?
A general agency can work with Shopify proof and conversion skills. A specialist is better when theme code, feeds or app stack changes drive growth. Check the named team, not the pitch team. Agencies like Swanky, We Make Websites and Eastside Co focus on Shopify. Journey Further, Impression and Mediaworks cover broader performance marketing.
Can an agency guarantee first-page rankings or ROAS?
No. Results depend on demand, margin, stock and competition. A credible agency sets a test plan and reports against agreed metrics.
What should be in the contract?
Cover scope, fees, notice and data access. Confirm account ownership and handover. Confirm who pays for ad spend and software. If the agency handles personal data, set out processor duties.
