A setback is the required distance between a building and property boundaries, streets, or other features, established by zoning bylaws. Front setbacks create consistent building lines along streets and space for sidewalks. Side setbacks ensure separation between neighbouring buildings for fire safety, privacy, and light access. Rear setbacks provide backyard space. Setbacks vary by zone and building type—industrial zones might have minimal setbacks while residential zones require more separation. Variances may be granted for reduced setbacks in specific circumstances. Environmental setbacks from waterways or sensitive areas protect natural features. Setback requirements significantly affect how much of a lot can be built upon.