It’s possible to build a fire pit on concrete, but it will make for a more difficult build. The best way to build a fire pit on concrete is by starting with landscaping bricks or other similar pavers that have been pre-cast. Each brick should be about 2″” larger than the diameter of the burner you are going to install in the fire pit so that it has room to expand and contract without cracking. After you’ve installed these bricks, cover them with landscape cloth before filling in the rest of the area with dirt or gravel.