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AI Visibility Index · September 2026

Roofers in Düsseldorf that AI assistants recommend

We asked ChatGPT, Claude and Gemini the four questions a buyer asks when looking for roofers in Düsseldorf, three times each, in German, and counted who they named. These are the businesses named in two or more of the 36 answers.

Check whether AI names youSee the ranking

Names are printed as the assistants wrote them. We have not checked that any of them is good, open, or real.

Roofers · Düsseldorf
14%of answers named K.H. Wirtz GmbH
Answers
36
Businesses named
33
Named only once
22
Named by 2+ assistants
0 of 11
Named again on a rerun
15%

Edition September 2026. Download the data

Asked for roofers in Düsseldorf, ChatGPT, Claude and Gemini most often named K.H. Wirtz GmbH (14% of answers), Schorn GmbH (14%) and H.J. Kock GmbH (11%). Across 36 answers they named 33 different businesses, 22 of them only once. Each of four buyer questions was asked three times, in German, in September 2026.

The ranking

The AI Recommendation Rate is the fraction of the 36 answers that named a business. The range under it is a 95% confidence interval: where two ranges overlap, the gap between those businesses could be chance.

Roofers in Düsseldorf named by AI assistants, September 2026
#BusinessAI Recommendation RateChatGPTClaudeGeminiQuestionsAvg. position
1K.H. Wirtz GmbHAlso written Dachdeckerei & Bauklempnerei K.H. Wirtz GmbH, Dachdeckerei & Fassadenbau K.H. Wirtz GmbHIs this your business?14%95%: 6 to 29%0%0%42%3 of 41.4
2Schorn GmbHAlso written Dachdeckerei & Fassadenbau Schorn GmbH, Dachdeckerei & Bauklempnerei Schorn GmbHIs this your business?14%95%: 6 to 29%0%0%42%4 of 42.2
3H.J. Kock GmbHAlso written Dachdeckerei & Fassadenbau H.J. Kock, Dachdeckerei & Fassadenbau H.J. Kock GmbH, Dachdeckerei & Holzbau H.J. Kock GmbH, Dachdeckerei & Zimmerei H.J. Kock GmbHIs this your business?11%95%: 4 to 25%0%0%33%3 of 42.8
4Schmitz GmbHAlso written Dachdeckerei & Fassadenbau Schmitz GmbH, Dachdeckerei & Bauklempnerei Schmitz GmbHIs this your business?8%95%: 3 to 22%0%0%25%2 of 42
5Peter KoxAlso written Dachdeckermeisterbetrieb Peter Kox, Dachdeckerei & Klempnerei Peter Kox GmbHIs this your business?8%95%: 3 to 22%0%0%25%3 of 42.7
6Dachdeckerei & Bauklempnerei J. & M. Krings GmbHIs this your business?6%95%: 2 to 18%0%0%17%2 of 41
7Dachdeckermeisterbetrieb Michael KockIs this your business?6%95%: 2 to 18%0%0%17%1 of 42.5
8Dachdeckermeisterbetrieb Ralf KlinkenbergIs this your business?6%95%: 2 to 18%0%0%17%1 of 42.5
9Dachdeckerei & Bauklempnerei Thomas KoxIs this your business?6%95%: 2 to 18%0%0%17%2 of 43
10H.J. KringsAlso written Dachdeckerei & Bauklempnerei H.J. Krings, Dachdeckerei & Fassadenbau H.J. Krings GmbHIs this your business?6%95%: 2 to 18%0%0%17%2 of 43.5
11Dachdeckerei & Bauklempnerei Thomas KringsIs this your business?6%95%: 2 to 18%0%0%17%2 of 44.5

Each assistant column is the share of that assistant's own answers. Questions counts how many of the four produced the name at least once; position is where it came in the answer's list, 1 being first. 22 more names came up in a single answer and are counted above but not listed.

Is this your business?

See what the assistants say about your business today. The free checker asks ChatGPT, Claude, Gemini and Grok two of the Index questions for this category, with the category and the place already filled in, and shows every answer word for word. About 30 seconds, no sign-up.

Check your businessNamed above? Add the badgeWhat the audit does

What each assistant said

The same questions, the same number of times, and often different names. Each column is one assistant's top five from the ranking above, with the share of its own answers that named them.

#ChatGPTClaudeGemini
1Named no businessNamed no businessK.H. Wirtz GmbH42%
2Schorn GmbH42%
3H.J. Kock GmbH33%
4Schmitz GmbH25%
5Peter Kox25%

ChatGPT named no business in any of its 12 answers. Claude named no business in any of its 12 answers.

Named here? Put it on your site

Every business in the ranking was named in two or more answers. The badge says that and nothing more: no position, because the ranges above do not support one. It links back to this page, so anyone can check.

Correct or remove a listing
Named by AI assistants: Roofers in Düsseldorf, AIGROW AI Visibility Index, September 2026
<a href="https://aigrow.gg/index/roofers/dusseldorf"><img src="https://aigrow.gg/badges/index/2026-09/roofers/dusseldorf.svg" width="312" height="100" alt="Named by AI assistants: Roofers in Düsseldorf, AIGROW AI Visibility Index, September 2026"></a>

The questions

Asked word for word, three times each, to every assistant, in German. The English under each is our translation. The prompt is the one the free scan uses. No web search, no location and no chat history, so every answer starts from the same place.

  1. 1Wer ist der beste Dachdecker in Düsseldorf?Who is the best roofer in Düsseldorf?
  2. 2Das Dach meines Hauses in Düsseldorf ist undicht. Welche Dachdeckerfirma soll ich anrufen?My roof is leaking in Düsseldorf. Which roofing company should I call?
  3. 3Welchen Dachdecker in Düsseldorf würdest du für eine komplette Neueindeckung meines Dachs empfehlen?Which roofing contractor in Düsseldorf would you recommend for a full roof replacement?
  4. 4Welcher Dachdecker in Düsseldorf kann mein Dach nach einem Sturm begutachten?Which roofer in Düsseldorf can inspect my roof after a storm?

How to read this page

The full method
What it measures
Which names these models produce when asked cold, from what they learned in training. It is not a review, a rating or our recommendation, and a business missing here may simply be one the models were never shown.
Why the ranges matter
36 answers is a sample. Asked again next month, most shares will move by a few points; the ranges say how far they could move by chance alone.
One business, several spellings
Branches, legal suffixes and spellings of one business are merged, and the other spellings are printed under its name. Names that might be two businesses are kept apart.
A name is wrong
If a business here is closed, misnamed or yours and you want it removed, tell us. We correct or remove it when the page is next published.

Where the assistants look

The sites read most often, with web search on, before the assistants answer about this category in Germany. From the AI Source Map: 8 answers.

See every site for this category
werkenntdenbesten.de
Read in 88% of the answers
trustlocal.de
Read in 75% of the answers
ziegelruf.de
Read in 75% of the answers

Elsewhere in the Index

Roofers elsewhere
BerlinCologneFrankfurtHamburgMunichStuttgart
Also in Düsseldorf
DentistsLawyersAccountantsPlumbersGymsReal estate agencies

Is your business on this list?

The free scan asks the same assistants the questions your customers ask, scores whether they name you, and lists who they name instead.

Run the free AI scanRead the method

Edition September 2026 · published by Guglielmo Paesano, founder of AIGROW · data under CC BY 4.0