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Walk-in closets are always the biggest and can easily be more than 100 square feet. Primary bedroom closets, even if not walk-ins, are the second largest category in most homes and sit between 30 and 80 square feet. Linen closets, utility closets, and built-in closets are smaller and, depending on their usage, tend to be between 10 and 50 square feet.

Plywood, MDF (medium-density fiberboard), and solid wood are all popular options for closet shelving. Plywood and solid wood are sturdy and ideal for extended shelves or heavy items. MDF is a budget-friendly choice for light to moderate storage, but it can sag under heavy weight if not adequately supported. Wire shelving is another alternative that allows airflow, making it especially useful in humid spaces such as laundry rooms or basements.

When you are securing your DIY home office built-ins to the wall, you should start by locating the wall studs. You'll then want to use long screws to attach the cabinets, shelves, and bookcases directly to the wall studs. Your built-ins will be far too heavy to attach to the drywall alone by using anchors.