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.

If you’re on a tight budget, the least expensive material you can buy for DIY closet shelves is chipboard, a.k.a. particle board. This inexpensive material is made from a pulp of sawdust, resin, and glue that’s pressed together under high temperature and pressure. As you can imagine, it’s not very sturdy and might buckle under your blue jean collection, so you should only use it if you’re storing very light items. 

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.

Although you can complete a closet frame in just an afternoon, finishing the entire closet will take a few days to a week. However, that’s still not as much as the average time it takes to remodel a closet, which can take anywhere from several weeks to more than a month. That’s because you also have to consider the time it will take to demolish the existing space, plan a new design, order materials, and actually install it.