The cost is always calculated individually. It depends on the area of the house, the level of detail in the project, the complexity of the architecture, and the scope of work. Premium design is not about "price per square meter," but about the depth of detail. The more complex the tasks (engineering, non‑standard solutions, custom furniture), the higher the budget. Another important thing is that a well‑designed project saves money at the implementation stage and eliminates the need for expensive rework.