In order to be entered in the list of consulting engineers maintained by the Thuringia Chamber of Engineers and thus also to establish compulsory membership, special factual requirements must be met, in particular professional qualifications proven by a corresponding engineering degree and proof of practical experience.

Entry in the list of consulting engineers, which requires the submission of an application, must be made if the following requirements are met:

1. The applicant must have their main residence, a professional establishment or the place of their predominant professional activity in Thuringia (§ 8 Para. 2 No. 1ThürAIKG).
   
2. The applicant must be entitled to use the professional title "engineer" within the meaning of Section 4 (1) ThürAIKG.
   
3. After acquiring the entitlement to use the professional title "engineer", he or she must have carried out at least two years of full-time practical work in the essential professional tasks in the field of engineering and thus have corresponding professional experience.
   
4. In order to be entered on the list of consulting engineers, the applicant must perform their professional duties independently and on their own responsibility at the time of application.
   
   The requirements to be fulfilled for this are set out in § 3 Para. 2 ThürAIKG. According to this, engineers who independently run their own engineering office, have joined forces with other members of the liberal professions and have a legal status within this association by virtue of which they can carry out their professional duties uninfluenced by the rights of third parties outside the profession within or outside the association are deemed to be working independently.
   
   Independent practitioners are those who do not pursue their own production, trading, supply or comparable economic interests when exercising their professional activity, nor do they represent third-party interests of this kind that are directly or indirectly related to their professional activity.
   
5. In addition, applicants must possess the reliability or suitability required for the profession of consulting engineer, otherwise a refusal pursuant to Section 12 (1), (2) ThürAIKG may be considered if there are relevant final criminal convictions, lack of legal capacity or financially disordered circumstances.

The application for entry in the list of consulting engineers is decided by the
Registration Committee of the Thuringian Chamber of Engineers (§ 26 Para. 2 ThürAIKG).

Anyone who uses the professional title of consulting engineer without authorization may be fined up to € 30,000 by means of administrative offence proceedings to be initiated by the Thuringia Chamber of Engineers.

Foreign service providers who are nationals of an EU member state or a state treated as such may use the professional title of Consulting Engineer if they have provided evidence to the Chamber of Engineers in accordance with Section 14 (6) ThürAIKG that they meet the requirements and are subsequently entered in the list of foreign service providers.