legal ground
Article 5 of the Regulations on Qualification Management of Construction Enterprises
The qualification of construction enterprises is divided into three sequences: general contracting qualification, professional contracting qualification and construction labor service qualification. Construction general contracting qualification and professional contracting qualification are divided into several qualification categories according to the nature and technical characteristics of the project, and each qualification category is divided into several qualification grades according to the specified conditions. The qualification of construction service is not divided into categories and grades.
skill
The above answer is only for the current information combined with my understanding of the law, please refer carefully!
If you still have questions about this issue, I suggest you sort out relevant information and communicate with professionals in detail.