US brands expanding into the UK and Europe often focus on localisation, shipping, tax, currency, and market demand, all very important and rightly prioritised. One thing that often gets forgotten is CSS, as it isn't used in America.
If you're used to running Shopping ads in the US, Comparison Shopping Services may not be part of your advertising vocabulary. In Europe, they matter. Understanding CSS can help US retailers avoid unnecessary costs and compete more effectively when entering European markets.
What is CSS?
CSS stands for Comparison Shopping Service.
In the European Economic Area, Google Shopping operates differently from the US. In Europe, retailers can run Shopping ads through Google's own CSS or through an alternative CSS partner. A CSS partner acts as the route through which your Shopping ads enter the auction, and can often give your ads a "bump" by unlocking more ad budget.
Why US brands often miss out on CSS when expanding to Europe
Many US retailers simply copy their existing Google Ads setup when expanding into new countries, localise the feed, and launch campaigns off that, ignoring CSS since it isn't part of the setup in America.
That may get ads live, but it may not be the most efficient structure. CSS should be part of the launch checklist for paid ads in Europe.
Why CSS matters for new market entry
Entering a new market is expensive and tricky. You are suddenly competing against local retailers with established brand recognition, existing customer bases, and market-specific experience that you don't have. You might not even understand the finer nuances.
CPCs may be higher than expected compared to your home country, conversion rates may be lower while customers learn who you are, and factors like shipping concerns, delivery times, and return policies can all drive up that cost. Using a CSS from the outset can help improve the economics of Google Shopping before you start scaling spend and finding your footing.
CSS is not a full strategy in a new market
We want to make this completely clear: CSS does not fix everything, and it isn't a box-ticking exercise for moving into a new market. It will not solve poor product data, weak landing pages, unclear pricing, bad stock availability or low brand trust. All of that still needs to be fixed and localised for your new market.
It is a structural advantage that makes your ads cost a little less, not a complete growth plan. US brands still need to localise product feeds, understand European search behaviour, review competitors, adapt pricing, and make sure landing pages meet customer expectations.
