How to choose a digital marketing agency for ecommerce

How do you choose a digital marketing agency for ecommerce?

Judge how an agency works, not what it promises. A good ecommerce agency derives targets from your margins, audits tracking first, reports with store data rather than platform screenshots alone, and leaves ownership of your ad accounts with you. Guaranteed results and opaque pricing are the clearest red flags.

In full transparency: Performetic is a performance marketing agency too. So we wrote this as a checklist to help you choose well, whether or not you work with us. Feel free to ask us the same questions.

Agency, freelancer or in-house team?

First decide whether you actually need an agency. The three models have different strengths and weaknesses:

Criterion	In-house team	Freelancer	Agency
Brand and product knowledge	Very high	Medium	Medium, grows over time
Breadth of expertise	Limited by team size	Usually one area	Multiple channels and disciplines
Scalability	Requires hiring	Limited by one person's capacity	Team can grow
Continuity risk	Knowledge leaves with employees	High dependence on one person	Process continues if people change
Cost structure	Salaries and benefits, fixed	Usually lowest	Varies with scope
Best fit	High spend, long-term investment	One channel, limited budget	Multichannel growth, need for fast expertise

Many growing brands end up with a hybrid: strategy and product knowledge in-house, execution and specialist work with an agency.

What questions should you ask an agency?

In early conversations, the answers to these questions reveal far more than promises do:

1. How do you set targets? A good answer asks about your contribution margin, break-even ROAS and customer lifetime value. For how to derive target ROAS from margin, see our break-even ROAS guide.
2. What will you do in the first 30 days? You should hear concrete steps such as a tracking audit, account structure review and a test plan.
3. How do you validate measurement? Do they reconcile platform data with store orders? Do they have server-side tracking experience?
4. Who will manage my account? Is the person on the sales call the one managing the account day to day? What is their experience?
5. How does creative production work? Who produces creative, how often is it refreshed, what is the testing process?
6. What will reporting look like? Which metrics, how often, from which source?
7. What did you get wrong with a similar brand, and what did you learn? An honest answer tells you more than a list of success stories.

What are the red flags?

• Guaranteed results. Firm promises like "we will double your ROAS in three months" cannot be made without seeing your account.
• Asking to own your accounts. If the ad account, Pixel or Merchant Center is opened in the agency's name, you lose your history when you leave.
• Vague pricing. If it is unclear what is included, extra charges appear later.
• Reporting with platform screenshots only. Reports that never connect to store revenue and profit are incomplete.
• Ignoring measurement. An agency that asks nothing about your tracking in the first meeting may end up optimizing on bad data.
• Long contracts that are hard to exit. Long commitments without a reasonable notice period deserve caution.
• Badges as the only proof. Programs such as Google Partners recognize agencies that meet certain performance, spend and certification requirements; that is a positive sign, but it does not replace experience in your category.

What should the contract include?

A contract makes both sides' expectations explicit. Make sure you discuss:

• Scope: Which channels, how many campaigns, whether creative production and landing page work are included.
• Asset ownership: All ad accounts, Pixel, Merchant Center, Analytics and creative files belong to the brand.
• Access model: Google Ads lets you assign users different access levels (such as admin, standard and read only). On Meta, you can give an agency partner access to assets in your business portfolio. Never share your own login.
• Fee model: Fixed fee, percentage of spend or performance-based, with written measurement definitions for each.
• Reporting and meeting cadence: Weekly or monthly reports and regular review meetings.
• Termination and handover: Notice period and the transfer of access, documentation and creative on exit.

What should a good report include?

A report should answer not just "what happened" but "why, and what is next":

• Store revenue, order count and total ad spend (blended ROAS).
• New customer count and customer acquisition cost.
• Spend, conversion value and platform ROAS by channel and campaign.
• Tests run, their results and learnings.
• A prioritized action list for the next period.

What does a good first 90 days look like?

The first three months are the best time to tell whether you chose well. A healthy start usually has three phases:

• Month one, diagnosis and foundations: The agency audits tracking, reconciles store orders with platform data, reviews account structure and sets targets with you based on your margins. Do not expect big jumps yet, but you should see a clear list of findings and a prioritized action plan.
• Month two, structure and testing: Campaign structure is simplified, a creative test plan goes live, and feed and landing page improvements begin, with written hypotheses and success criteria.
• Month three, scaling decisions: Budget moves to winning campaigns and creatives, weak ones are cut, and a review meeting compares results with the starting point using store data.

An agency that asks you about margins, stock, the promotional calendar and customer feedback is a good sign. Communication should run both ways: share launches, price changes and stock issues in time.

What should you watch for when switching agencies?

If you are leaving your current agency, make sure every account and asset sits in your own business accounts before access is removed. Ask for campaign history, creative files, audience lists and documentation of the tracking setup. A new agency's first job should be to understand the existing setup and validate measurement, not to delete everything.

Key takeaways

• Define the need first: in-house, freelancer and agency suit different situations.
• Ask about target setting, measurement validation and the first 30-day plan.
• Guaranteed results, requests to own your accounts and vague pricing are red flags.
• Keep ownership of all assets and grant the agency access only.
• Reports should rest on store data, new-customer metrics and an action plan.

If you would like to put these questions to us as well, you can request a free growth analysis from the Performetic team through our contact page.