Construction of utility projects for fluids companies in Düsseldorf

Düsseldorf ·Currently listed companies in the Construction of utility projects for fluids industry headquartered in Düsseldorf.

21 companies · 1–20 of 21

ACL Projekt GmbH GmbH · HRB 101590 Düsseldorf (Dusseldorf) · 2021
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Adam Creutz GmbH GmbH · HRB 28481 Düsseldorf (Dusseldorf) · 1992
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ALMA Leckageortung GmbH GmbH · HRB 111031 Düsseldorf (Dusseldorf) · 2025
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Bückendorf GmbH GmbH · HRB 106798 Düsseldorf (Dusseldorf) · 2024
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Grundwissen Tiefbau GmbH GmbH · HRB 20933 Krefeld · 2025
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HS Csöszer Rohrleitungsbau GmbH & Co.KG GmbH & Co. KG · HRA 22417 Düsseldorf (Dusseldorf) · 2013
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KA Bauunternehmung UG (haftungsbeschränkt) UG (haftungsbeschränkt) · HRB 101271 Düsseldorf (Dusseldorf) · 2023
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Konzept Bau GmbH GmbH · HRB 108370 Düsseldorf (Dusseldorf) · 2023
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KT Kanal- und Tiefbaugesellschaft mbH GmbH · HRB 34431 Düsseldorf (Dusseldorf) · 1997
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Leak24 GmbH GmbH · HRB 103039 Düsseldorf (Dusseldorf) · 2024
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LEDOO Bau GmbH GmbH · HRB 79140 Düsseldorf (Dusseldorf) · 2016
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Pol-Tech GmbH GmbH · HRB 83464 Düsseldorf (Dusseldorf) · 2018
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ProTief Baumanagement GmbH GmbH · HRB 108299 Düsseldorf (Dusseldorf) · 2025
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PW Infra GmbH GmbH · HRB 101942 Düsseldorf (Dusseldorf) · 2023
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Ratinger Hochdruck Rohrleitungsbau GmbH GmbH · HRB 48137 Düsseldorf (Dusseldorf) · 2003
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Rohrfuchs GmbH GmbH · HRB 86302 Düsseldorf (Dusseldorf) · 2019
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SA Projektbau GmbH GmbH · HRB 105967 Düsseldorf (Dusseldorf) · 2024
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SICIM S.p.A. AG · HRB 109497 Düsseldorf (Dusseldorf) · 2019
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TIKA Tief-, Kanal- und Rohrleitungsbau GmbH GmbH · HRB 71298 Düsseldorf (Dusseldorf) · 2013
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Ulli Tief- und Fernmeldebau GmbH GmbH · HRB 67712 Düsseldorf (Dusseldorf) · 2012
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All industries in Düsseldorf

Live API

GEThandelsregister.ai/api/v1/search-organizations

?limit=20

&filters={"city":"Düsseldorf","industry_code":"42.21.0","industry_scheme":"WZ2025"}

# pip install handelsregister
from handelsregister import Handelsregister

client = Handelsregister(api_key="YOUR_API_KEY")  # or set HANDELSREGISTER_API_KEY
page = client.search_organizations(
    filters={
        "city": "Düsseldorf",
        "industry_code": "42.21.0",
        "industry_scheme": "WZ2025"
    },
    limit=20,
    skip=0,
)
print(page["total"])
for item in page["results"]:
    print(item["name"], item["registration"]["register_number"])

// npm install handelsregister
import { Handelsregister } from 'handelsregister';

const client = new Handelsregister('YOUR_API_KEY'); // or set HANDELSREGISTER_API_KEY
const page = await client.searchOrganizations({
  filters: {
      "city": "Düsseldorf",
      "industry_code": "42.21.0",
      "industry_scheme": "WZ2025"
  },
  limit: 20,
  skip: 0,
});
console.log(page.total);
for (const item of page.results) {
  console.log(item.name, item.registration.register_number);
}

// npm install handelsregister
const { Handelsregister } = require('handelsregister');

const client = new Handelsregister(process.env.HANDELSREGISTER_API_KEY);
(async () => {
  const page = await client.searchOrganizations({
    filters: {
        "city": "Düsseldorf",
        "industry_code": "42.21.0",
        "industry_scheme": "WZ2025"
    },
    limit: 20,
    skip: 0,
  });
  console.log(page.total);
  for (const item of page.results) {
    console.log(item.name, item.registration.register_number);
  }
})();

curl 'https://handelsregister.ai/api/v1/search-organizations?limit=20' \
  -H 'x-api-key: YOUR_API_KEY' \
  -G --data-urlencode 'filters={"city":"Düsseldorf","industry_code":"42.21.0","industry_scheme":"WZ2025"}'

{
    "results": [
        {
            "entity_id": "<32-char hex>",
            "name": "<string>",
            "registration": {
                "court": "<string>",
                "register_type": "<string>",
                "register_number": "<string>"
            },
            "address": {
                "house_number": "<string>",
                "street": "<string>",
                "postal_code": "<string>",
                "city": "<string>",
                "county": "<string>",
                "state": "<string>",
                "country": "<ISO country>",
                "coordinates": {
                    "latitude": "<float>",
                    "longitude": "<float>"
                }
            },
            "registration_date": "<ISO date>",
            "purpose": "<string>"
        }
    ],
    "total": "<int>",
    "meta": {
        "request_credit_cost": "<int>",
        "credits_remaining": "<int>"
    }
}

results[]

entity_id string

Stable 32-char hex identifier. Pass straight into /fetch-organization as `q`.

name string

Registered company name.

registration object

address object

Postal address with street, house_number, postal_code, city, county, state, country and coordinates (latitude/longitude).

registration_date date

Initial entry into the commercial register (ISO date).

purpose string

Stated business purpose (Unternehmensgegenstand).

top-level

total integer

Total result count for pagination.

meta.request_credit_cost integer

Credits actually charged for this call.

meta.credits_remaining integer

Account credit balance remaining after this call.

Location · Industry · Legal form · Full-text

Filters & master data — via search-organizations

City, industry, legal form, registration date: every argument combinable through the filters parameter. One REST endpoint, every German company.

Location & geo Filter by city, postal code, state and county through city, postal_code, state and county.
Industry (WZ2025) Industry segmentation via the official WZ2025 codes — industry_code combined with industry_scheme.
Legal form GmbH, AG, KG, OHG and more via legal_form_code.
Company size bs_company_size_category – small, medium, large based on balance-sheet totals.
Active status Restrict to active entries or include deleted companies via active.
Registration date Date ranges via registration_date_from and registration_date_to.
Full-text search Free-text query via the q parameter (min. 2 characters).
Pagination skip and limit (up to 30 results per call) for deep lists.
Master data per result entity_id, name, address, registration and registration_date – pass entity_id straight to /fetch-organization.

Run every filter live with an API key. Get an API key →

Code · AI-Agents · No-Code · Workflows

Drops into any stack

The search-organizations API speaks every mainstream client: REST, Python, Node, MCP for AI agents, n8n and webhook platforms.

REST API Simple GET request with the X-API-KEY header and JSON-encoded filters. Python requests, httpx or your favourite library — pass filters via json.dumps. Node.js fetch or axios with URLSearchParams. Works in edge, worker and browser runtimes. MCP Server Directly in Claude, Cursor or any MCP-aware AI client as the search_organizations tool. n8n Pre-built custom node for workflow automation — city, industry and size as filter inputs. Webhook Callable from Zapier, Make or any other webhook platform.

This list in your app

Grab an API key and filter every German company by city, industry, size and more — straight from your application. One REST endpoint, every result.

Get an API key

Filters & master data — via search-organizations

Drops into any stack

This list in your app

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