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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.

How many days it takes to remodel a closet will also depend on the scale of the project. Small changes like installing a prefab kit will eat up an afternoon and no more, while a total renovation could require several days to a week. If you’re planning for the latter, plan to secure other sleeping arrangements while construction is ongoing.

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.

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.