As of Wed, October 16, residential backyard burning no longer requires a permit. However, please have mercy on your neighbours and burn only on a day with a good venting index. You can find a map showing the venting index on the right-hand side of this website.
Keep in mind that category 3 piles always require a permit. Category 3 piles are those that were built by a machine or those that contain stumps or large logs.