Claims that UK Google Ads CPMs have overtaken US rates make for a dramatic headline. The public data available for Q1 2026 does not support that conclusion.
It does show something less sensational and more useful for advertisers: the UK search market is attracting more money, available impressions are under pressure, and competition is making each auction harder to read.
The first problem with the CPM claim is the metric itself. Google Search campaigns are usually tracked through cost per click, conversion cost, impression share, and return on ad spend. CPM is more commonly associated with impression-led Display and Video campaigns.
Lumping all of Google Ads into one CPM figure hides the difference between someone watching a YouTube placement and someone actively searching for a product or service.
UK Advertising Spend Is Still Growing
The wider UK market gives advertisers plenty of reason to expect tougher auctions.
The latest Advertising Association and WARC expenditure data put UK advertising investment at £46.7 billion in 2025, up 6.4% year over year. Search remained the largest category, accounting for 38.3% of total spending.
The same forecast expects the market to grow again in 2026, reaching almost £50 billion.
The Q1 2026 IPA Bellwether Report points in the same direction. A net balance of 7.3% of respondents increased their total marketing budgets, the strongest result in nearly two years. Main media budgets also returned to growth, with online advertising and video among the categories receiving more investment.
The IPA summarised the Q1 findings in this update on where UK marketers increased their budgets.
None of this proves a UK-US CPM crossover. It does show more money moving into an already crowded market.
Fewer Impressions Can Make Every Auction Count
Google Ads benchmark data adds another layer.
Optmyzr’s Q1 2026 Google Ads report found that impressions fell year over year while click-through rates increased. Conversion rates also dipped.
That combination matters. Advertisers may be generating a similar number of clicks from a smaller pool of available impressions. Competition becomes more concentrated, and weaker campaigns have less room to waste traffic.
Auction Insights can help show where that pressure is coming from. Google’s own report tracks metrics such as impression share, overlap rate, top-of-page rate, and outranking share. It does not reveal a competitor’s bid, budget, CPC, or CPM.
Advertisers therefore need to look at their own account trends rather than rely on a broad national headline.
A retailer might see more competitors entering auctions for high-intent product terms. A local service company may lose top-of-page visibility to national lead-generation brands. Another account may face rising costs because its landing pages or ad relevance have weakened, not because the whole UK market crossed a historic threshold.
What UK Advertisers Should Review
Companies comparing agencies specialising in Google Ads campaigns should ask for account-level evidence rather than a single market average.
Useful questions include:
- Has impression share fallen because of budget or ad rank?
- Are CPCs rising across the account or only in a few high-value categories?
- Has conversion rate fallen as automation reaches broader audiences?
- Are competitors appearing more often at the top of the page?
- Is revenue keeping pace with the increased cost of traffic?
The distinction matters because a higher media cost is not automatically a bad result. If stronger intent, better conversion value, or higher margins offset the increase, the campaign may still be healthier.
The public Q1 data supports a clear conclusion. UK advertising demand is growing, search remains the country’s largest ad category, and Google’s available inventory is becoming more valuable.
It does not support the claim that UK Google Ads CPMs overtook US CPMs for the first time in 20 years.
The more credible story is that UK paid search is becoming harder to manage with averages alone. Advertisers need auction data, conversion quality, and commercial outcomes before deciding whether their costs are genuinely too high.