There are a few reasons custom closets are expensive: materials used, the luxury factor, and time to build. The people who can afford custom closets are those who can afford increased rates, and construction workers and contractors know this and charge accordingly. The time to build custom closets is substantial, especially if expensive material is being used or intricate details (like carved wood) are added to the project. 

If you have a bathroom closet with movable shelves, you can place them at virtually any spacing that works for you. Useful measurements between shelves in the working, or middle, section can be 10 to 16 inches for towels or linens. Lower or higher shelving could be up to 24 inches between shelves to store lesser-used or bulky items or boxes. 

There are certainly luxury upgrades you can make but you can seriously improve the look and functionality of a closet without spending much money. Color matching will make the closet seem bigger so any shelves painted the same as the wall is a good tip. While pre-made closet organizers may seem expensive they offer an aesthetic look that's hard to achieve with DIY methods. Lastly, removing clutter and unworn items will help the closet seem bigger and cleaner.

Closet design services include help designing and laying out your closet for maximum utility, visual appeal, and return on investment. Many closet designers can also include the carpentry required to construct your custom closet. You should speak with your designer beforehand to determine what services are included in the estimate, and prepare to lay out additional funds for materials or labor as needed.