Thelloy Development Group Limited, an investment holding company, provides property construction services in Hong Kong. The company offers building construction services; repair, maintenance, alteration, and addition work services; and design and build services. It also provides modular housing solutions, as well as develops properties. The company serves government, quasi-government organizations, universities, schools, institutions, and incorporated owners of private buildings. The company was incorporated in 2015 and is headquartered in Lai Chi Kok, Hong Kong. Thelloy Development Group Limited is a subsidiary of Cheers Mate Holding Limited.