Engineering activities for technical building equipment companies in Aachen

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

56 companies · 1–20 of 56

AAINA GmbH - Institut für Nachhaltiges Bauen Aachen GmbH · HRB 15422 Aachen · 2009
f7f5262487…
aqua_plan Ingenieurgesellschaft für Problemlösungen in Hydrologie und Umweltschutz mbH GmbH · HRB 5290 Aachen · 1992
fd6595aa9e…
ATD Ingenieurgesellschaft für Abwasserwirtschaft und technische Dienstleistungen mbH GmbH · HRB 6961 Aachen · 1997
39f0433f0c…
AYED-ENGINEERING GmbH GmbH · HRB 23028 Aachen · 2019
ae13bb6f46…
B-84 GmbH GmbH · HRB 18392 Aachen · 2013
df37e094ae…
caensus GmbH GmbH · HRB 17601 Aachen · 2012
5d5407d138…
CodePlan GmbH GmbH · HRB 28935 Aachen · 2025
4373fb181d…
DSTR Planungsgesellschaft für technische Gebäudeausstattung mbH GmbH · HRB 8494 Aachen · 2001
2f019e2ea6…
E3D Ingenieurgesellschaft mbH GmbH · HRB 20994 Aachen · 2017
f11345a471…
ECON Umwelt-Ingenieure GmbH GmbH · HRB 4711 Aachen · 1991
3690135c3b…
EUtech Scientific Engineering GmbH GmbH · HRB 7816 Aachen · 1999
8a07b0650c…
F. HILGER INGENIEURGESELLSCHAFT mbH GmbH · HRB 6753 Aachen · 1996
b754028483…
Feldmann + Weynand Consulting Engineers GmbH GmbH · HRB 20552 Aachen · 2016
6393a0ac20…
Feldmann + Weynand GmbH GmbH · HRB 7645 Aachen · 1999
f75025ae0d…
FORM BAU- & INGENIEUR GmbH & Co.KG GmbH & Co. KG · HRA 6339 Aachen · 2005
cf261596c7…
FTS Fireprotection Technical Support e. K. e.K. · HRA 10165 Aachen · 2024
0b6421c114…
GEBRA Gesellschaft für Betriebsorganisation und Rationalisierung mbH GmbH · HRB 2291 Aachen · 1981
9f65421aa6…
GRI Gebäude- und Raumklimatechnik Ingenieure GmbH GmbH · HRB 25007 Aachen · 2021
fc421aa9b8…
GVIS Ingenieurgesellschaft mbH GmbH · HRB 7556 Aachen · 1999
9368fe1159…
H + P Ingenieure GmbH GmbH · HRB 19583 Aachen · 2015
93a94aed7c…

All industries in Aachen

Live API

GEThandelsregister.ai/api/v1/search-organizations

?limit=20

&filters={"city":"Aachen","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": "Aachen",
        "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": "Aachen",
      "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": "Aachen",
        "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":"Aachen","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

Cookie Settings

Customize Cookie Settings