Choose a size and design that is appropriate for your budget and region. The diameter of store-bought fire pit models typically ranges from 24 to 30 inches. Built-in units can range in width from 36 to 58 inches. Fire bowls can range in height from low-to-the-ground to higher variants. The depth of your fire pit should be no deeper than the height of your grill. Otherwise, you will not be able to sit down near it. Fire pits are available as free-standing units or built into the ground. The latter type is called an outdoor fireplace. They can be made of stone, metal, plastic or wood. Plastic versions are usually only heat resistant up to 400 degrees Fahrenheit while metal ones can reach 500 degrees F. Wooden fire pits are by far the most affordable option and also the lowest maintenance one. You will need to add some kind of fuel every day or two depending on how often you use your fire pit. Wood chips, sawdust, or sticks are good choices for this purpose. Make sure that you use non-toxic materials when adding fuel to your fire pit. Coal fires are popular in many regions around the world including parts of Canada and the United States. However, you must get your coal from a reputable source and cleanly burn it in a ventilated area to avoid inhaling smoke particles.