1. Determine function. Think carefully about what you want your new room to do and who will be using it. Ask yourself what will be required of the space. Will you be hosting events there? How many people should it hold? What are you and your family's limitations due to height, age and physical ability? Consider the ages of those in your household — how durable and accessible does everything need to be? Think about all the activities you'll be doing in the room — from paying bills to having family talks. "The more questions you ask and honestly answer will help you to ensure the space is planned properly and will function, as well as be aesthetically pleasing," says designer Marie Hebson. "Each individual prioritizes things differently. Be honest with yourself. Be flexible if you need to, so that your room can grow with your family."