Outdoor kitchens can be portable or permanent structures. One example of a portable structure is a barbeque island, which is often place on wheels or casters so it can be easily moved to the area but is kept on the deck or patio when not in use. These types of islands will often feature counter space, a stove unit, slot for a grill and sometimes a refrigerator unit, and sink. This unit offers a wide array of features and is usually made of stainless steel, synthetic materials, or wood. They can also be made using a combination of materials.
Some of the more elaborate outdoor kitchens may be built into an open-air structure and covered with an awning, pavilion, or some other type of covering to protect you from the elements. This type of structure normally is built on concrete or tile flooring. Many times these elaborate units are combined with a bar or dining area to make the kitchen more functional. Some homeowners opt to build it adjacent to the home so plumbing and electricity can be run to the area. This will allow you to use appliances in the space also.
You can design your own outdoor kitchen and have it custom built by professionals or do it yourself. Many of the things you need to build one can be purchased at home improvement stores along with the grills, outdoor furniture, etc.