What Qualifications Are Doors and Windows?

What qualifications are doors and windows? For this problem, because the individual qualification of doors and windows was canceled by the state in 2015. At present, the qualification of door and window engineering belongs to the qualification of Building Decoration Engineering. Therefore, it is OK to apply for the qualification of building decoration and Decoration Engineering and the professional contracting qualification of building curtain wall engineering.

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First tier brands of doors and windows