Part 1 of a spec section states whether a mock-up is required. It gives the size, the location and whether it can stay as finished work.
A masonry section may call for a sample wall panel with the specified brick, mortar and joints. A painting section may call for a sample room.
Search your section for the word mock-up before you price. A freestanding one costs material, labor and later removal.
A mock-up also affects the schedule. Work of that type may not start until the architect approves it.