March 2025: AI Mode arrives in Search Labs alongside a core update
Covers March 2025. Part of our search timeline: a month-by-month look at the changes that shaped SEO, AI search, paid ads and social media, written in November 2026 for local businesses with the benefit of hindsight.
Quick answer: During March 2025 Google launched AI Mode as a Search Labs experiment, giving conversational AI-written answers to more involved questions, with room for follow-ups. A broad core update rolled out in the same month. AI Mode was a clear sign that Google Search itself was heading towards something that behaves like an AI assistant.
Looking back from late 2026, March 2025 was the month Google showed its hand. Alongside its usual ranking work, it started testing a version of Search built around conversation rather than a list of links. For a local trade business, that changes how a customer might go about finding someone to fix a leaking roof or service a boiler.
What did Google launch in March 2025?
Google said AI Mode used a method it called query fan-out, firing off lots of related searches behind the scenes and combining what it found into a single answer. At first only some users in the US could try it. The March 2025 core update also began rolling out that month.
Why should UK trades and service businesses care?
It made clear that both ChatGPT and Google were shifting towards search that answers the question directly. Think of a homeowner asking about a new boiler: before they choose an engineer, they want to know about costs, sizes, brands, grants and how long fitting takes. Websites that answered those smaller questions properly became more useful to an AI building a complete reply.
What to do about it now
- List the questions a customer works through before booking you, then answer each one plainly on your site.
- Link your helpful guides and your service pages to each other so the connections are obvious.
- Keep an eye on how core updates affect each type of page, such as service pages, area pages and blog posts.
Frequently asked questions
What does query fan-out mean?
It’s the approach Google uses to split one question into lots of related searches, then merge what comes back into a single AI-written answer.
When could people in the UK use AI Mode?
UK users were given access to AI Mode in July 2025.
Sources and further reading
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