How does ChatGPT find local plumbers to recommend?

ChatGPT holds no directory of businesses. When somebody asks it for a plumber, it searches the web at that moment and builds its answer from whatever it finds: business websites, trade directories and Google Maps entries. The firms it names are the ones whose information it can read, verify and quote back.

This is part of a bigger question about Does ChatGPT recommend plumbers, and how does it choose? The short version is that the answer changes depending on how the question is worded, and most plumbers are invisible to it either way.

What ChatGPT actually reads to build the answer

ChatGPT, Perplexity and Google's AI each search the web when someone asks a local question and pull together sources in real time. In a probe run in August 2026, three assistants were asked for a plumber in Bristol at the same minute. ChatGPT named eight businesses and every source it used was a Google Maps entry. Perplexity named five and linked every one to that firm's own website. Google's AI returned four with star ratings and a Call button. Twelve different firms appeared between the three assistants. Two of the three shared none of the same names. The firms ChatGPT named were rated 4.99 or 5.0 (August 2026 probe, recorded in the CitedBy probes log, 19 August 2026).

So the question is not "is my business on the internet?" It is "can these assistants find clear, credible information about me when someone asks for a plumber in my town?"

The question type changes what they read

Ask for a recommendation and the answer tends to come from listings. Describe a problem and the answer tends to come from web pages. That distinction decides where you need to be visible.

In a probe run around the same period, ChatGPT was asked ten problem-shaped questions about a Norfolk plumber: things like a water leak or no heating. Of the 39 sources ChatGPT used across those ten answers, 34 came from businesses' own websites, not from directories or listings (CitedBy probes log, docs/marketing/local-seo/probes/2026-08-19-what-ai-answers-are-built-from.md, 19 August 2026).

That matters because the questions people put to AI assistants are almost always problem-shaped. Across UK searches tracked in a DataForSEO AI Keyword Data pilot published 23 June 2026, "no hot water" received 24,959 AI searches a month. "Bristol plumber" received 32. If your website only covers the job title and not the problem, you are invisible to the larger pool of questions. If you are asking yourself why the phone has gone quiet, this is where those enquiries go instead.

Why distance matters less here than it does on the map

On Google's map, proximity to the searcher is a dominant factor. A plumber based two towns away from a city centre will struggle to appear on that city's map no matter how good his reviews are.

AI assistants weight it differently. According to Darren Shaw, who runs the Whitespark Local Search Ranking Factors survey, distance matters less in AI results: an assistant will prefer a business further away if its reputation is strong, its reviews say the right things, its website holds the relevant information and it is one of the few offering that specific service (Darren Shaw, Whitespark, pulled 28 August 2026).

This means a heating engineer based outside a city can appear in AI answers for that city if his site and reviews are strong. That is not possible on the map, where the centre of the town the searcher types anchors the results. The factors that move AI answers and the factors that move the map share only one of their top ten signals, according to the same Whitespark 2026 survey. They are two different surfaces and need two different things from you.

What he has to do, in the order it makes sense

These are the six things that determine whether an AI assistant can find and name your business.

1. Have a website with a page for each job. The assistant footnotes the firm's own site in problem-shaped answers, not a directory profile.
2. Write pages that answer the problem questions. "Why is there no hot water but the heating works" is what people ask an assistant. "Emergency plumber Bristol" is what they type into a search box. Both are worth having and they are different pages.
3. Put a price range on every job page. Without a price you are excluded from every question that asks about cost, which is most of them.
4. Cover the four things that get a business quoted: what a job costs, what goes wrong with it, who it is a bad fit for, and when to repair rather than replace.
5. Get your Google listing complete and collect reviews that name the job. Recommendation questions are answered from listings, and every firm named in the Bristol probe was rated 4.99 or higher.
6. Get mentioned on real websites that are not directories. A prose mention on a real publication ranks 7th of 187 factors for AI answers in the Whitespark 2026 survey, and 115th for the map.

What should be on a trade website covers the page structure in more detail if you are building from scratch.

What the top AI-visibility factors have in common

None of the top ten factors for AI answers in the Whitespark Local Search Ranking Factors 2026 survey is a field you can edit on your Google Business Profile. Four are about the website, four are about mentions and reviews on other websites, and two are about your reviews. The survey covered 47 experts and 187 factors, published 6 November 2025.

The map and the AI answer share one factor in their top ten. That is the critical practical point: what you have already done to rank on the map is almost entirely different from what gets you into an AI answer. A well-optimised Google listing helps with recommendation questions. It does not help with problem questions. Those need pages on your website, and most trade websites in the UK have none of them.

What being in an AI answer is actually worth

Being named in an AI answer is not the same as being on the map with a phone number. Most AI answer panels remove the tap-to-call button, so a reader who sees your name has to go and find you separately. That converts worse than a map result with a Call button showing. Say that plainly: AI visibility is valuable, but it is the top of a journey, not the end of it.

The opportunity is this: a plumber outside the city centre who cannot win a place on the map can win an AI answer on reputation, completeness and being the firm whose site actually explains the job. Those two things are almost never the same business right now. Almost no UK trade business is writing problem-shaped pages yet, which means the gap is open and the competition for it is thin. The pages that serve AI answers are also the pages that serve a good website, so there is no separate exercise. It is the same work, done once, serving both surfaces.

If you are currently spending on lead sites to cover the gap, compare what that bill is actually buying before you add another cost.

One honest limit before you act on this

An AI assistant's answer changes between two identical runs. The same question asked of the same assistant twice can return different names. Practitioners who track this run each question three to five times to get a directional read, not a measurement (Darren Shaw and Devesh Khanal, pulled 28 August 2026). Any tool or agency that presents a single AI result as a ranking is selling the report, not the work.

What you can do is check whether you are being named at all, which is a different and answerable question.

CitedBy is built for a UK trade business that has a website and a Google listing but is not sure whether AI assistants can find it. Every month it asks ChatGPT, Perplexity and Google's AI the problem questions built from your own tracked searches, records whether your business was named and which sources the answer used, and turns that into a score and a short fix list. If you have no website and no Google listing yet, get those in place first: getting on Google's map is the right starting point for you.

Q: Does ChatGPT use my Google Business Profile to find me?

A: For recommendation questions, yes: in the Bristol probe, every source ChatGPT used was a Google Maps entry. For problem questions, no: the same assistant built 34 of 39 sources from businesses' own websites. You need both.

Q: Will being on Checkatrade or MyBuilder help me appear in ChatGPT?

A: Directories may appear in some answers, but they name the directory, not you. Problem-shaped answers are built from business websites. Whether directory fees are worth paying is a separate calculation from AI visibility.

Q: Does my distance from a city affect whether ChatGPT names me?

A: Less than it affects the map. AI assistants will name a business further away if its reputation and website are strong, according to the Whitespark 2026 survey. On the map, proximity to the town centre is far harder to overcome.

Q: How often does Google show AI answers for plumber searches?

A: In a study of 979 UK local-intent searches, a Google AI Overview appeared on 2.1% of trade searches (Studio 36 Digital, June 2026). That measures Google's results page only; it says nothing about someone opening ChatGPT or Perplexity directly.

See if I'm getting any of this work