Although open floor-plan design is very popular these days, living space still needs to be divided while keeping cost down, this is done mainly with cheap interior doors. When choosing a wooden interior door, there are two basic categories; solid core and hollow core. Here are the benefits and disadvantages of both.
Solid core doors are expensive, usually twice the cost of hollow doors. They can be more decorative, offering a variety of panel styles. The biggest advantage is that they provide a sound buffer between rooms.
Hollow core doors are lightweight and cheap. They are sturdy enough but do not provide a good noise barrier. Most styles are a blank slate (simply a flat surface) although some panel options are available.
The best way to save money with interior door selection is deciding where you need quiet the most. Often the master bedroom or office is a good place for solid core doors. Closets and hallways are a great place for hollow doors.
Begin by selecting a door style; a flat door will be least expensive but a six panel door offers a more decorative look. These two door styles are offered in solid and hollow core. Count all your closet doors and deem them hollow. This will take a big chunk out of the cost. After that, decide how much your budget allows for the master bedroom, office, and bathroom. If there is any money left over, consider a steel door for the playroom.