A cardboard parking garage answers a persistent problem in preschool car play: where do all the cars go? Building one from cardboard involves real engineering decisions — how do cars get from one level to another? (A ramp.) How wide does each space need to be? (Wide enough for the biggest car.) How many levels can you stack before it tips? (Depends on the base.) These are genuine engineering questions with testable answers.

What You'll Need

• Large sturdy cardboard box as the main structure
• Additional cardboard sheets for ramps and level floors
• Tape and box cutter (adults only)
• Markers to draw parking spaces and lane markings
• Toy cars for testing each level as it is built

Building Steps

1. Decide on the number of levels — two is manageable for beginners.
2. Cut the front of the box open partially — this becomes the entrance facade.
3. Cut openings on each level for the cars to enter.
4. Build the ramp: a strip of cardboard angled from one level to the next, wide enough for toy cars.
5. Test the ramp angle — too steep and cars slide; too shallow and they stall.
6. Draw parking spaces on each level with marker.
7. Add a "roof level" for additional parking.

Frequently Asked Questions

How steep should the ramp be for toy cars?

Test with your specific cars. Most small die-cast cars roll freely on a 15–20 degree incline. Too steep (over 30 degrees) causes cars to roll too fast and flip. Too shallow means cars don't roll at all. Add raised edge strips (cardboard strips taped along the sides) to prevent cars from rolling off the ramp edge. Let children test the ramp and adjust the angle — this is a direct physics lesson.

Related projects: Train Track Town | City from Boxes | Marble Maze