Best Google Ads Agency for Ecommerce Brands: How to Choose.

The best Google Ads agency for ecommerce brands runs Shopping and Performance Max from a clean Merchant Center feed, splits brand from non-brand search, sets ROAS targets from your margins instead of a round number, and reports by product, not just by campaign. It should also know where Google spend overlaps with your Amazon sales and with demand you would have captured anyway.

This guide covers the Google Ads side only. For the wider question of who should run a DTC brand's whole growth program, see our DTC marketing agency guide. For how we run ecommerce as one system, see our ecommerce page.

What an ecommerce Google Ads specialist does that a generalist does not.

A generalist builds keyword campaigns, turns on Performance Max and reports a blended ROAS. An ecommerce specialist treats the product feed, the margin on each SKU and the order record as the real inputs:

• Feed first. Titles, product types, GTINs and custom labels in Merchant Center decide which queries your Shopping and Performance Max ads can match.
• Brand and non-brand kept apart. Searches for your brand name convert at a different rate and cost than category searches. Blending them hides whether you are finding new customers.
• Margin-based targets. A 4x ROAS is profitable on one product and a loss on another. Targets come from contribution margin by product group.
• Order-level measurement. Purchases tie back to the click and the SKU, so reporting shows which products and campaigns make money after ad cost.

The hard parts of Google Ads for ecommerce.

Google changes these requirements often, so check each against its help pages at the time you read this.

• Merchant Center feed requirements. Google's product data specification requires an id, title, description, link, image_link, availability and price for every product, plus brand for most new products. MPN is required when a product has no manufacturer GTIN, and condition is required for used or refurbished items. Variants need item_group_id in the US, and some apparel needs color, size, age_group and gender. Missing or wrong values mean disapproved products or poor query matching.
• Misrepresentation. Merchant Center's misrepresentation policy requires honest business and contact details, disclosed return fees and the full cost including taxes, fees and recurring charges. Google says egregious violations such as deceptive pricing can suspend an account on detection, without prior warning.
• Performance Max cannibalizing brand. Performance Max will happily take credit for branded searches. Google's brand exclusions keep a Performance Max campaign off branded queries on Search, Shopping and YouTube search inventory, with a separate checkbox for whether Shopping ads may still show on excluded brand searches.
• Returning customers counted as growth. Google's customer acquisition goal can bid higher for new customers or bid only for them, in Search, Shopping, Performance Max and Demand Gen, using your customer list and website tag to identify who is existing.
• Amazon overlap. Many shoppers who see your Shopping ad also check Amazon. If your brand sells there, some Google spend shows up as Amazon sales Google never sees, and some Google conversions are buyers Amazon would have won anyway.
• Landing pages are product pages. Shopping clicks land on the product page in your feed, so page speed, stock status, price and shipping cost on that page must match the ad. Local Services Ads are built for local service businesses, so they rarely apply to a product brand.
• Platform numbers that disagree. Google Ads, GA4 and Shopify count purchases differently. Reconcile to your store's orders.

Criteria to judge an ecommerce Google Ads agency.

If you want cost of goods in Google's own reports, Google supports a cost_of_goods_sold attribute in the feed and conversions with cart data, which together let Google Ads report gross profit for products that have a cost value. Item IDs sent with the conversion must match the feed IDs exactly.

Questions to ask in the first call.

• What is wrong with our Merchant Center feed today, and what would you fix first?
• How would you separate brand from non-brand, and how much of our current ROAS comes from branded searches?
• What ROAS target would you set for each product group, and how did you get there from our margins?
• How will you report results by product, not only by campaign?
• How do you account for our Amazon sales when you judge Google spend?
• Which conversions would you optimize on, and how do they reconcile to Shopify or our store's orders?
• Who has access to the Google Ads and Merchant Center accounts, and what are the notice terms?

Red flags.

• A blended ROAS with brand and non-brand mixed together, offered as proof of performance.
• Performance Max turned on for the full catalog with no brand exclusions and no product grouping.
• No one can name the feed errors or disapproved products in your account.
• A ROAS promise before anyone has seen your margins.
• Reporting that never mentions products, new customers or your store's order count.
• No view of Amazon or retail sales for the same products.

How pricing usually works.

Ecommerce Google Ads agencies usually charge a flat monthly management fee, a percentage of ad spend, a flat fee with spend tiers, or a fee with a performance component tied to revenue or margin. Ad spend is normally paid to Google directly. Ask what is included, how the fee changes as spend grows, and what the notice period is.

At Theory Road, pricing is quoted in conversation once we understand the goal. Builds are scoped as fixed projects, and media management runs monthly with a minimum term, then month to month.

How to run the selection.

Where Theory Road fits.

We run Google Ads management for product brands that sell direct, through retail and on Amazon from the Austin, Texas area. For ecommerce brands, we build feeds that keep Google Shopping clean, run Shopping and Performance Max from a Merchant Center feed beside Search, apply brand exclusions, and measure Google Shopping to contribution margin. We capture click IDs through the cart into the order record and upload orders and revenue to Google Ads nightly, so bidding learns from orders instead of clicks.

Every account starts with an audit against live data before anything changes. Accounts link to our manager account with full access for your team. We report contribution margin after advertising by channel and new customer cost, blended and by channel, and because we also run Amazon, Klaviyo and affiliate for product brands, we report those channels together as one number.

For a broader view of judging any paid search agency, see our guide to the best PPC agency for niche businesses, and our Google Ads service page for how we work.

FAQ.