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3 hotels in Cologne hold GreenSign certification. Each one is audited by an outside body, on a schedule it does not set itself.
Wikimedia CommonsA&O Hostel Köln NeumarktSituated in the central Neumarkt district of Cologne, this budget hostel and hotel provides practical accommodations. It offers a mix of private and sIndependently certified
Novum Hotel Ahl MeerkatzenThis central hotel is located in the southern part of Cologne’s old town. It offers functional accommodations within walking distance of the Rhine andIndependently certified
Novum Hotel LeonetThis central hotel in Cologne offers modern accommodations in the Altstadt-Süd area. It provides a practical base for exploring the city’s historic siIndependently certifiedGreenSign scores a hotel across categories spanning management, building services, purchasing, food, social conditions and guest communication, and awards one of five levels. Assessment starts from a documented self-audit and is verified by InfraCert, with on-site checks at the higher levels. The tiering is the useful part: the level is on the certificate, so it distinguishes a hotel that has just started from one several cycles in.
The lower levels are reachable largely on documentation and policy, so a level-one certificate is a weaker signal than the badge alone suggests — the level matters more than its presence. It is also concentrated in German-speaking markets, so it is not comparable in coverage to Green Key.