How to Choose an Ecommerce Advertising Agency: Compare the Work

Choose an ecommerce advertising agency by comparing the work it will actually perform, who will perform it and how you will evaluate the result. A confident pitch and an attractive ROAS screenshot are not a substitute for those answers.

Start with the constraint in your business. You may need stronger creative, better account management, reliable measurement or a store that converts suitable visitors. Those are different briefs.

Put two proposals on the same page

Imagine a fictional home-goods store comparing two agency proposals. Proposal A is $3,000 a month for media management and reporting. Proposal B is $4,500 and also includes a defined creative-production allowance and landing-page work.

The completed comparison reads: “B costs $1,500 more, but the scopes differ. Ask A what equivalent creative and page work would cost. Ask B who produces the assets, what revisions are included and which site changes require separate approval.” These invented prices illustrate comparison, not market rates.

The useful question is total work and responsibility. Choosing the smaller number before aligning scope may leave the store buying the missing work elsewhere.

Ask to see how the team makes decisions

Request a sample account review with private client information removed. Look for a clear problem, supporting evidence, a proposed action and a way to evaluate it. Ask what would make the team hold a budget increase.

Have the agency explain how it separates platform attribution from store orders and contribution. A sales claim should specify the period, costs, returns and work performed. Another client's result is context to investigate, not your forecast.

Check creative and conversion responsibilities

Agree on who develops concepts, writes copy, obtains product material and secures usage rights. Specify the number and type of deliverables, the review process and what happens when a concept fails.

For the website, define whether the agency only recommends changes or implements them. Ask who checks mobile buying, inventory, offer consistency and checkout. A report saying “improve CRO” is not a completed improvement.

Keep ownership and access clear

Your business should understand who owns the ad accounts, analytics, creative files, product feeds and reporting history. Document access, billing responsibility, approval limits and the exit process before work begins.

Ask who handles urgent issues and who covers the account when the usual manager is unavailable. The person on the sales call may not be the person running the campaigns.

Agree on the commercial review

Use a baseline your team can reconcile. Include media, agency, creative and other relevant acquisition costs. Review new-customer acquisition and contribution with clear treatment of discounts, refunds and repeat orders.

Set a cadence that fits your volume and purchase cycle. Frequent check-ins can catch broken tracking quickly; meaningful performance judgments may need more mature evidence. Neither a fixed return nor a fixed improvement date belongs in the agreement as an assumed outcome.

Send the same brief to the finalists

Provide your priority products, margin constraints, current bottleneck and required scope. Ask each agency to identify its first investigation and what information it needs.

Discuss ecommerce advertising with Experience Advertising if you want to compare that approach with your needs. Bring the same brief you give every finalist so the choice remains useful and fair.