A permit is required to remove, cut down or in any other way injure a tree with a diameter of 30 cm (12 inches or the approximate thickness of a telephone pole) or more on private property. The tree diameter measurement must be taken at 1.4 m (4.5 feet or approximately at chest height) above ground level. It applies to trees on all land use types including, single family residential properties. Trees of all diameters on private property within Ravine Protection Areas of the City of Toronto, are protected under the provisions of City of Toronto Municipal Code Chapter 658, Ravines.