At what point in a project should a construction site mock up be made?

The mock-up phase usually follows the design phase, and precedents the onset of major construction work. This enables project teams to trial key design features and building practices. The construction site mock-up can be used to test finishes, façade systems, interior details or structures before they are reproduced throughout the project. Building a mock-up early on can help uncover issues, refine plans and prevent costly changes when the building construction is underway, thus making building construction smoother and more efficient.