Answer:
construction specifications
Step-by-step explanation:
Construction contracts must always include construction specifications. These specifications refer to what materials, installations and specialized labor is required to perform correctly the building process.
Architects are paid for their blueprints, i.e. their designs. Sometimes an architect can recommend certain materials that fit his/her design, but the contractor is responsible for carrying on the actual construction.
The contractor has to specify which materials will be used and how the construction process will be carried out. E.g. it is not the same to build a house with luxurious materials like expensive floors and ceilings than a normal house.