construction materials; building materials
Refers to materials used in construction, such as lumber, concrete, steel, and fixtures.
I ordered construction materials to build a new house.
The prices of construction materials are soaring.
建材 is a more common abbreviation for building materials, while 建設資材 is a longer, more formal term often used in industry contexts.
Compound of 建設 (construction) and 資材 (materials).