Rongzun International Holdings Group Ltd is an investment holding company. It operates in two segments: Alteration & addition works and Civil engineering works. Its Alteration & addition works include new structural works, fitting-out works, changes in facilities configuration, construction of a new extension to an existing building, conversion of an existing building to different types, fabrication, modification, removal, or installation of hardware and equipment; erection, relocation, or removal of partitions, doors, and windows; changes in the type of finishes and flooring materials. The Civil engineering segment includes site formation works and foundation works. All of its revenues are generated from Hong Kong.