Protected trees
Protected trees: any species with a trunk diameter of 19 inches or more, measured 4.5 feet above the ground; a permit is needed to remove or impact them. Heritage trees: 24 inches or more of listed species, including Texas ash, bald cypress, American elm, cedar elm, Texas madrone, bigtooth maple, all oaks, pecan, Arizona walnut and eastern black walnut; removal is prohibited except as provided in Section 25-8-641, and larger impacts need a variance (a public process applies to heritage trees 30 inches or more). On commercial and multifamily properties, trees 8 inches or more in diameter are regulated. For regulated trees, no more than 25% of the canopy may be removed without a permit.