A zero-step entry requires the exterior approach to slope toward the entry at no more than 1:20 (5%) and have a cross slope of no more than 1:50 (2%). The threshold at the door must be no more than 1/2 inch with a beveled edge per ANSI A117.1 Section 404.2.5. In Utah, freeze-thaw detailing matters: exterior concrete at threshold transitions must be designed to manage the 100+ annual freeze-thaw cycles that can heave approaches and create step conditions within 3–5 years without proper detailing. On flat lots, a zero-step entry is essentially free. On hillside lots, it may require site-specific grading design, new concrete, and drainage work — all of which are far less expensive when designed in from the beginning of site planning than added to a completed project.