Thelloy Development Group Limited, an investment holding company, provides property construction services primarily in Hong Kong. The company offers building construction; repair, maintenance, alteration, and addition work services; and design and build services. It also provides interior decoration services; and invests in 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 Kowloon, Hong Kong. Thelloy Development Group Limited is a subsidiary of Cheers Mate Holding Limited.