Yes, adding a built-in or custom closet generally increases your home's value and makes it more attractive to potential buyers. A well-designed closet adds utility, organization, and a touch of luxury, which are appealing selling points. Most homeowners see a return on investment (ROI) of 50% to 60%; for example, a custom closet can add about $1,000 to your home's value on average. The specific ROI depends on the type, with custom walk-in closets typically providing more value than reach-in closets. However, to maximize value, ensure the closet doesn't significantly detract from the room's usable square footage. Converting an entire room into a closet can actually lower your home's value. Similarly, using overly lavish materials may not recoup their cost. A good strategy is to add a closet that takes square footage from a non-living area, such as a garage, to create a mudroom closet.

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. 

Adding a mudroom is one of the most budget-friendly home additions compared to other projects, costing between $8,000 and $16,000 on average. Not only is the room often quite small, but it also requires minimal fixtures or wiring to make the room practical. The most costly features include a weatherproof floor and an exterior door.

Costs depend on material, customization level, and additional features like lighting or sliding doors.