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AI Visibility Index · September 2026

Roofers in Cologne that AI assistants recommend

We asked ChatGPT, Claude and Gemini the four questions a buyer asks when looking for roofers in Cologne, 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 · Cologne
28%of answers named K.H. Wirtz
Answers
36
Businesses named
29
Named only once
22
Named by 2+ assistants
0 of 7
Named again on a rerun
20%

Edition September 2026. Download the data

Asked for roofers in Cologne, ChatGPT, Claude and Gemini most often named K.H. Wirtz (28% of answers), Dachdeckerei & Bauklempnerei Peter Schorn GmbH (25%) and Dachdeckerei & Bauklempnerei H.J. Schmitz (11%). Across 36 answers they named 29 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 Cologne named by AI assistants, September 2026
#BusinessAI Recommendation RateChatGPTClaudeGeminiQuestionsAvg. position
1K.H. WirtzAlso written Dachdeckerei & Fassadenbau K.H. Wirtz GmbH, Dachdeckermeisterbetrieb K.H. Wirtz GmbHIs this your business?28%95%: 16 to 44%0%0%83%4 of 42
2Dachdeckerei & Bauklempnerei Peter Schorn GmbHAlso written Dachdeckerei & Bauklempnerei Peter SchornIs this your business?25%95%: 14 to 41%0%0%75%4 of 41
3Dachdeckerei & Bauklempnerei H.J. SchmitzAlso written Dachdeckerei & Klempnerei H.J. Schmitz GmbH, Dachdeckerei & Bauklempnerei H.J. Schmitz GmbH, Dachdeckerei & Fassadenbau H.J. Schmitz GmbHIs this your business?11%95%: 4 to 25%0%0%33%4 of 43.5
4Ralf KlinkenbergAlso written Dachdeckerei & Bauklempnerei Ralf Klinkenberg, Dachdeckermeisterbetrieb Ralf KlinkenbergIs this your business?11%95%: 4 to 25%0%0%33%3 of 43.5
5Peter SchifferAlso written Dachdeckerei & Bauklempnerei Peter Schiffer GmbH, Dachdeckermeisterbetrieb Peter SchifferIs this your business?6%95%: 2 to 18%0%0%17%2 of 41.5
6Dachdeckerei & Fassadenbau Schmitz GmbHIs this your business?6%95%: 2 to 18%0%0%17%2 of 43
7Dachdeckerei & Zimmerei J. & M. KuhlmannAlso written Dachdeckerei & Bauklempnerei J. & M. Kuhlmann, Dachdeckerei & Zimmerei J. & M. Kuhlmann GmbHIs this your business?6%95%: 2 to 18%0%0%17%1 of 44

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
1No other name twiceNamed no businessK.H. Wirtz83%
2Dachdeckerei & Bauklempnerei Peter Schorn GmbH75%
3Dachdeckerei & Bauklempnerei H.J. Schmitz33%
4Ralf Klinkenberg33%
5Peter Schiffer17%

ChatGPT named no business in 10 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 Cologne, AIGROW AI Visibility Index, September 2026
<a href="https://aigrow.gg/index/roofers/cologne"><img src="https://aigrow.gg/badges/index/2026-09/roofers/cologne.svg" width="312" height="100" alt="Named by AI assistants: Roofers in Cologne, 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 Köln?Who is the best roofer in Cologne?
  2. 2Das Dach meines Hauses in Köln ist undicht. Welche Dachdeckerfirma soll ich anrufen?My roof is leaking in Cologne. Which roofing company should I call?
  3. 3Welchen Dachdecker in Köln würdest du für eine komplette Neueindeckung meines Dachs empfehlen?Which roofing contractor in Cologne would you recommend for a full roof replacement?
  4. 4Welcher Dachdecker in Köln kann mein Dach nach einem Sturm begutachten?Which roofer in Cologne 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
BerlinDüsseldorfFrankfurtHamburgMunichStuttgart
Also in Cologne
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