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To prevent sagging, consider both the material and the span of the shelf. Using sturdy materials such as plywood or solid wood can provide better support than particleboard. Additionally, limiting the shelf span to 36 inches or less can reduce the risk of sagging. For longer shelves, incorporating center supports or brackets can offer additional reinforcement.

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. 

Fortunately, there are no hard and fast rules or regulations regarding the height of closet shelving. However, the typical height for a single closet shelf with a hanging bar is 70 inches from the floor. For a double-hanging system, use 84 to 85 inches from the floor for the top one and 42 inches for the lower.

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.