You need a license to work as a real estate agent.

This applies if you commercially

• broker the conclusion of contracts for land, land rights, commercial premises, residential premises or loans or provide evidence of the opportunity to conclude such contracts,
• broker the acquisition of share certificates of an investment company, foreign investment shares, other publicly offered investments that are managed for the joint account of investors, or publicly offered shares in and securitized claims against a corporation or limited partnership, or
• provide investment advice within the meaning of the exemption in Section 2 para. 6 sentence 1 no. 8 of the German Banking Act (KWG)

or if you carry out construction projects

• prepare or carry out building projects in your own name for your own account or for the account of a third party and use assets of purchasers, tenants, leaseholders or other beneficiaries or of applicants for purchase or usage rights for this purpose,
• as a building supervisor, prepare or carry out economic preparations in the name of a third party for the account of a third party.