The ideal ceiling height for a two post car lift is typically between 8 and 10 feet, although the exact size will depend on the make and model of the lift. Generally speaking, you'll want to have at least 8 feet of clearance in order to safely fit a large vehicle under the lift. If your garage has an existing structure or fixtures above 8 feet, you may need to look into a four post car lifts that can provide extra height for larger vehicles. Remember that it's important to also consider other factors when deciding what type of car lift is right for your garage such as how much weight it can handle and if there are any space constraints due to low ceilings. Additionally, be sure to get professional advice before making any purchases so you know exactly what type of lift best suits your needs.