Ottawa Tree Removal Permit Do you have a tree in your backyard that is a nuisance, rotting, or has an infestation? You probably want it gone. The City of Ottawa has in the last decade made significant efforts to protect trees both in urban and rural areas from being cut. If you have to cut down a tree, even if it’s on your private property, you need a permit. When must you apply for a tree removal permit? If the tree you intend to remove is 50 cm in diameter, …