There is no way any municipality would ever approve a fire pit with a roof. Check with your local fire department to see what their requirements and specifications are. Where I live, the fire pit cannot be within 35 feet of any structure. Hope this helps.

I think you have your thinking wrong.. What you do is build a pavillion with a fireplace or firepit in it. You just need to build a chimney of sorts.. You can use stove-pipe or a brick supported chimney with small column supports for an open pit design..

what you need is an old tire rim...cut out the spokes...lay a perimeter of bricks about 1 foot away...and fill with gravel...then for a nice finish build a brick patio around the pit to desired dimensions...then build your pavilion around the patio and about 7 to 8 feet high...with a hole in the center of the roof and some stove pipe...insert wood and light...enjoy!!