I've burned huge piles in South Texas that easily shot flames 30-40 feet in the air. No permits needed, but I did use a fair amount of common sense. If winds were anything more than 5-6 mph, or the relative humidity was below 40%, it was a big nope for me. I also dug a burn pit 4 feet deep, burned early in the mornings when dew was still on the ground, and kept a hose close by at all times. Never had an issue. Conversely, we were coming home from church one Sunday morning, and had to rescue a few houses from a trash fire started by a neighbor that turned into a grass fire. We were in a burn ban, and winds were coming in at 15+ mph. Not the smartest thing to do. I didn't hear what happened to him after all that.