
Planning and expert consulting office for building services engineering, drinking water hygiene and energy consulting
TGA-Planungsgesellschaft Steden mbH
Dortmund (DE)New on Amplifa
About TGA Steden
TGA-Planungsgesellschaft Steden mbH is a planning and expert consulting office for building services engineering (TGA) based in Dortmund. The company carries out the planning of building services equipment across all HOAI service phases, from the determination of fundamentals to object support. Its services include, alongside TGA planning, the recording of the object status with CAD documentation, object support with inspection, maintenance and repair, the development of energy concepts as well as hygienic planning of drinking water installations and risk analyses in accordance with the Drinking Water Ordinance. Owner Werner G. Steden has been a publicly appointed and sworn expert for the plumbing and heating trade since 1999. The eight-member team of engineers, an architect, system planners and master craftsmen serves clients such as municipalities, investors, architects, housing companies as well as charitable and church institutions, including the Rhenus Group and the Dortmunder Aktien-Brauerei.
- Site
- Dortmund
- Processes
- TGA planning (building services equipment, all HOAI service phases 1-9), Object status recording (as-is condition survey, CAD documentation, situation analysis), Object support (inspection, maintenance, repair, system optimisation, energy monitoring), Energy concepts / energy consulting (GEB dena, EnEV, EnergiePlusHouses), Expert services for the plumbing and heating trade, TGA planning (all HOAI service phases 1–9), Building energy consulting, Object status / as-is condition analysis with CAD documentation
- Materials
- TGA Planning (HOAI LP 1–9), Drinking Water Hygiene, Energy Consulting, Expert Services, Object Status and Object Support
- Certificates
- Certification Risk Analysis §16 para. 7 TrinkwV 2001, Building Energy Consultant (dena), On-Site Consultant (BAFA), VDI/DVGW 6023 Category A, Risk Analysis §16 para. 7 TrinkwV 2001, ISO 9001
- Employees
- 8
- Industries
- Municipalities, Commercial and private investors, Architects, Housing companies, Social and charitable organisations, Church institutions
- 01
Determination of fundamentals
- 02
Preliminary planning
- 03
Design planning
- 04
Approval planning
- 05
Execution planning
- 06
Preparation of and participation in tendering
- 07
Object supervision / construction and defect supervision
- 08
Object support / documentation
Scope of Services and Processes
TGA Planning (HOAI LP 1–9)
Planning of the technical equipment of buildings across all HOAI service phases.
Drinking Water Hygiene
Hygienic planning of drinking water installations (VDI 6023 Cat. A) and risk analyses in accordance with §16 para. 7 TrinkwV.
Energy Consulting
Energy concepts and building energy consulting as dena-GEB and BAFA on-site consultant.
Expert Services
Expert assessment services for the plumbing and heating trade.
Object Status and Object Support
As-is condition analysis with CAD documentation as well as inspection, maintenance and repair.
Locations

Dortmund
DEOffice / Expert office
Services



Inside the production



Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| TGA planning (building services equipment, all HOAI service phases 1-9)Engineering | – | – | – | – | – |
| Object status recording (as-is condition survey, CAD documentation, situation analysis)Engineering | – | – | – | – | – |
| Object support (inspection, maintenance, repair, system optimisation, energy monitoring)Engineering | – | – | – | – | – |
| Energy concepts / energy consulting (GEB dena, EnEV, EnergiePlusHouses)Engineering | – | – | – | – | – |
| Expert services for the plumbing and heating tradeTesting | – | – | – | – | – |
| Testing | – | – | – | – | – |
Additional services
Reference customers
Qualification and Certification
The qualification is evidenced by the public appointment and swearing-in of the owner (Chamber of Crafts Dortmund) as well as certifications according to VDI/DVGW 6023 Category A and §16 para. 7 TrinkwV 2001. In addition, there are accreditations as building energy consultant (dena) and on-site consultant (BAFA).
| Evidence | Dortmund |
|---|---|
| VDI/DVGW 6023 Category A | |
| Risk Analysis §16 para. 7 TrinkwV 2001 | |
| Building Energy Consultant (dena) | |
| On-Site Consultant (BAFA) | |
| ISO 9001 |
History
- 1999
Public appointment as sworn expert for the plumbing and heating trade
- 2013
Participation in the competition '100 EnergiePlusHouses for Dortmund' with the energy concept for the EnergiePlusHaus of Dipl.-Ing. Stephan Becker
- 2014
Upgrade training VDI 6023 Category A according to the Drinking Water Ordinance of 11/2011 successfully completed (27.05.2014)
- 2017
Projects including Rhenus Data Office GmbH Nottuln and Rhenus Logistics Centre Dortmund
- 2018
Certification for the risk analysis according to §16 para. 7 TrinkwV 2001 (10.10.2018)
- 2019
Renewal of the VDI 6023 Category A certification (31.01.2019); project Rhenus Campus 1st construction phase, Holzwickede
- 2020
Exemption certificate according to §48 para. 1 EStG (24.02.2020 to 28.02.2022)
- 2027
The public appointment as expert expires at the end of February 2027 (reappointment for 5 years)