What should be calculated before considering any deductions in baseboard length?

Calculating the total baseboard length before considering any deductions is fundamental because it establishes the entire perimeter that will require baseboard installation. This total is essential for determining how much material will be needed initially. Once the total length is established, deductions can then be made for areas where baseboards will not be installed, such as around doors, windows, or any interruptions in the wall surface.

Understanding the total baseboard length ensures that you start with complete visibility of the project's material requirements, thereby preventing underestimations or overestimations early in the process. It's a crucial initial step that informs all subsequent calculations and decisions related to the project.