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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.

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.

Plywood offers excellent stability and strength for drawer construction. Baltic birch plywood provides a premium appearance, while standard hardwood plywood offers good value. Solid wood works well but requires more attention to grain direction and seasonal movement.

The time it takes to build a closet varies widely depending on the project's size, complexity, and level of customization. On average, construction can take anywhere from a few days to two weeks.

A simple reach-in closet might be completed in less than a day, while a more complex walk-in closet could take one to two days or more. A typical project often falls in the 2-to-5-day range. However, a large, highly customized walk-in closet that requires structural changes, like moving a load-bearing wall, will take significantly longer.

A professional contractor can provide the most accurate time estimate for your specific project. If you are planning a DIY build, it is best to budget additional time.