Engineering activities for technical building equipment companies in Düsseldorf

Düsseldorf ·Currently listed companies in the Engineering activities for technical building equipment industry headquartered in Düsseldorf.

172 companies · 1–20 of 172

A.T.P. Architettura Tecnologia Progetti S.R.L. Zweigniederlassung Deutschland S.r.l. · HRB 101961 Düsseldorf (Dusseldorf) · 2023
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AE SEVEN Germany GmbH GmbH · HRB 101054 Düsseldorf (Dusseldorf) · 2015
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AES - Automotive Engineering Services GmbH GmbH · HRB 76749 Düsseldorf (Dusseldorf) · 2016
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AES Arbeits Entlastungs Service GmbH Personalgestellung + Ingenieurbüro GmbH · HRB 18854 Düsseldorf (Dusseldorf) · 1984
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AES PG GmbH GmbH · HRB 112375 Düsseldorf (Dusseldorf) · 2026
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AK Service GmbH GmbH · HRB 88932 Düsseldorf (Dusseldorf) · 2018
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AkuThermConsult GmbH GmbH · HRB 30759 Düsseldorf (Dusseldorf) · 1994
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ALD Engineering & Consulting GmbH GmbH · HRB 83422 Düsseldorf (Dusseldorf) · 2018
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Alpha Tech Engineers GmbH GmbH · HRB 105694 Düsseldorf (Dusseldorf) · 2024
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AMG Ingenieurbüro GmbH GmbH · HRB 89672 Düsseldorf (Dusseldorf) · 2020
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Apleona R & M Ausbau Düsseldorf GmbH GmbH · HRB 64761 Düsseldorf (Dusseldorf) · 1999
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Appoldt GmbH Ingenieurbüro für Elektrotechnik GmbH · HRB 26593 Düsseldorf (Dusseldorf) · 1991
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Aqua-Planing Wasser-Service GmbH GmbH · HRB 97077 Düsseldorf (Dusseldorf) · 2000
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AQUIST GmbH GmbH · HRB 37608 Düsseldorf (Dusseldorf) · 1999
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ASOS Process GmbH GmbH · HRB 102464 Düsseldorf (Dusseldorf) · 2023
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ASVK Architektur- und Sachverständigenbüro Kaiser e.K. e.K. · HRA 25600 Düsseldorf (Dusseldorf) · 2019
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B & E Gebäudetechnik GmbH GmbH · HRB 84683 Düsseldorf (Dusseldorf) · 2018
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B-Plan UG (haftungsbeschränkt) UG (haftungsbeschränkt) · HRB 74596 Düsseldorf (Dusseldorf) · 2015
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Bauernfeind Energie Consulting UG (haftungsbeschränkt) UG (haftungsbeschränkt) · HRB 95326 Düsseldorf (Dusseldorf) · 2021
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Baukontor Niederrhein GmbH Architekten + Ingenieure GmbH · HRB 99168 Düsseldorf (Dusseldorf) · 2015
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All industries in Düsseldorf

Live API

GEThandelsregister.ai/api/v1/search-organizations

?limit=20

&filters={"city":"Düsseldorf","industry_code":"71.12.3","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": "71.12.3",
        "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": "71.12.3",
      "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": "71.12.3",
        "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":"71.12.3","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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