Framing and structural

• What you want to changeRemoving a wall, adding an opening, or new structure
• Whether the wall carries anythingWalls running across the joists usually do
• Whether you have an engineerMost municipalities require a stamped drawing before the permit
• What is in the wallPlumbing stacks, ducts and wiring have to go somewhere

General guidance, not advice on your own situation. The person you hire decides what applies to it.