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The vertical space between closet shelves depends on what you're storing. For clothing like shirts and sweaters, 10 to 12 inches is enough. Towels and linens need 12 to 15 inches, while tall storage bins may require 18 inches or more. Overcrowding your shelves can reduce accessibility and increase clutter, so be sure to leave breathing room for your items.

The differences between a built-in closet and a walk-in aren’t that different from a built-in wardrobe and a walk-in closet. It’s fairly simple—a walk-in closet is a closet you can physically enter, stand in, and walk around in. A built-in (whether wardrobe or closet) is more akin to covered shelves installed into a recess in the wall. Another big difference is walk-in closets almost always have traditional full-size doors, while built-ins either have no doors or use sliding doors.

You may need a building permit to add a closet, depending on the size and kind of work required to install it. The most likely scenario requiring a permit involves changing the structure of the house and performing electrical work for closet lighting. A permit can cost between $100 and $450. If you’re installing a smaller reach-in closet, a permit may not be required, but always check with your local municipality and consult a closet designer or builder.

A standard walk-in closet has dimensions of 7 feet by 10 feet at a minimum and an average of 100 square feet. Remember that the dimensions of the closet aren’t necessarily the usable space. This means that a 100-square-foot walk-in closet with shelves on each wall and an island may only have a walkable area of 50 square feet or less. Make sure you consider the effect of additions when you plan the room—mockups are a great idea.