How do you choose the right interior designer? Start with their portfolio of past work. Do you like what you see? Ask the designer if they were the ones who designed the built-ins. Ask if their degree is in interior design? You will want a professional helping you. Ask about the square footage of the projects so you know they are experienced in working on large projects if that is what you need. Even though the approach will be similar working on condos or custom homes it does require additional skill working on larger projects. - Alexander Interiors, McLean, VA.