On average, building a custom or built-in closet costs around $2,100. However, the total price can range from as little as $500 for a simple DIY project to $6,000 or more for a large, high-end custom closet. Most projects typically fall between $1,500 and $5,000.

The final cost depends on several factors, including the closet's size, type, materials, and features. Here is a general cost breakdown by closet type:

• Reach-in closet: $500 to $1,500

• Walk-in closet: $750 to $5,000

• Wardrobe: $2,000 to $6,000 or more

Choosing a prefabricated closet system is generally less expensive than a fully custom build. The scope of design and construction services will also significantly impact the price.

When you are securing your DIY home office built-ins to the wall, you should start by locating the wall studs. You'll then want to use long screws to attach the cabinets, shelves, and bookcases directly to the wall studs. Your built-ins will be far too heavy to attach to the drywall alone by using anchors.

Some features and upgrades you can add (some of which increase the closet’s value) are: modular shelving, motion-activated lighting, climate control, custom lighting, cigar humidors, revolving shoe racks, jewelry shelves, custom woodwork, and built-in laundry hampers. While only truly luxury closets have all of these, many custom closets have at least one special feature listed above. 

You can modernize an old-looking closet by just painting it, but beyond that, consider electric elements like recessed or accent lighting. If this is a large and deep closet, you can consider adding an island to the middle or a nice ottoman on a rug. Luxury closets will have even more items, like felt-lined drawers for watches and jewelry, in-wall safes, electronic shoe storage, or a tablet catalog of their items.