Builders always know what to do because they have special plans made by engineers. These plans are like a big treasure map!
1. **Shapes**: The plan shows the shape of the building, just like how a picture shows what a house looks like. It tells builders how tall it should be, how wide, and even if it has a roof that is pointy or flat.
2. **Doors and Windows**: The plan also shows where the doors and windows go. Imagine drawing where your toy room is, and forgetting to put a door—how would you get in? The plan makes sure every room can be reached!
3. **Materials**: Engineers also tell builders what special things to use, called materials. This means they choose if the walls will be made of wood, bricks, or maybe concrete. It’s kind of like picking the right ingredients to bake a cake!
So, just like when you build with blocks, the builders look at their plans to make sure everything is just right!