Germany – Repair and maintenance services of central heating – Rahmenvertrag Instandhaltungsarbeiten HLS

Open tender by Kölner Verkehrs-Betriebe AG for a framework agreement (3 partners) covering repair and maintenance services in heating, ventilation, sanitary, and air conditioning (HLS) across the company's properties in Cologne. Duration 4 years (possibility of 2-year extension). Estimated value not disclosed. Submission deadline: 22 June 2026, 08:00 CET. Bidders must provide two comparable references of similar value (≥€25,000) and demonstrate an average of at least 10 employees over the last three years. Award criteria not specified in the notice. Procurement documents are referenced but not analyzed; strict submission via electronic means in German.