Build something awesome with LEGO®
Design and build your own LEGO creation—vehicle, robot, or building—then test, modify, and explain how it works to learn engineering.
About this activity
Design and build your own LEGO creation—vehicle, robot, or building—then test, modify, and explain how it works to learn engineering.
What you need
Step by step
- 1
Step 1
Gather all the LEGO bricks and the paper and pencil listed in Materials Needed.
- 2
Step 2
Choose whether you will build a vehicle robot or a building.
- 3
Step 3
Draw a simple sketch of your idea on the paper showing the main parts.
- 4
Step 4
Pick the main LEGO pieces you will need from your pile to match your sketch.
- 5
Step 5
Build a basic prototype of your design using the pieces you picked.
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Step 6
Test your prototype by rolling it on a flat floor or checking if it stands steady.
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Step 7
Write down one problem or thing that could be better after the test.
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Step 8
Change one specific part of your design to fix the problem you wrote down.
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Step 9
Test your modified creation to see if the change helped.
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Step 10
Write one short explanation of how your creation works and what you improved.
- 11
Step 11
Share your finished creation on DIY.org
Fun facts
How do I guide my child to design and build their own LEGO creation?
Start by picking what to build—vehicle, robot, or building—and sketch a simple plan. Gather bricks and specialized parts (wheels, axles, gears). Build a rough prototype, then test for balance, movement, or stability. Observe failures, make small changes, and re-test. Encourage the child to explain steps, describe problems and solutions, and note measurements or take photos. Repeat iterations to improve design and learn engineering thinking.
What materials do we need to build a LEGO engineering project at home?
You'll need a variety of LEGO bricks: plates, bricks, slopes, axles, wheels, gears and connectors. A baseplate helps stability; motorized elements, Technic beams, and pins add engineering options. Keep a small tool (brick separator), tape measure, notebook, and camera for testing and documenting. Optional: batteries or small motors, sensors, and a tablet for building apps. Substitute household items (cardboard, rubber bands) if you're missing parts.
What ages is designing and building LEGO projects suitable for?
Suitable for ages 4 and up: 4–6 enjoy guided builds and basic vehicles with adult help for small pieces. Ages 6–9 can design simple robots or cars, learn gears and stability. Ages 9–12 handle more complex Technic parts, motors and gearing. Teens can combine coding with motors and advanced engineering. Always supervise young children for choking hazards and when using batteries or power components.
What are the learning benefits and safety tips for LEGO engineering projects?
This activity builds problem-solving, spatial reasoning, fine motor skills, and persistence through testing and iteration. Kids learn basic physics, engineering concepts and communication when they explain their designs. To stay safe, sort and store small pieces, choose age-appropriate sets, supervise use of motors and batteries, and keep workspaces tidy. Encourage gradual challenges—start simple, then add moving parts—to reduce frustration and keep learning fun.
Watch & Learn
Need help?
What can we use instead of LEGO bricks or the paper and pencil listed in Materials Needed?
Use Duplo or wooden/foam blocks in place of LEGO bricks and a notebook, sticky notes, or cardstock plus a crayon or marker instead of the paper and pencil.
My vehicle won't roll or my building keeps toppling during the Test your prototype step—what should we check?
If it won't roll, check that wheels are mounted on straight axles and remove pieces that rub the floor, and if it won't stand, rebuild with a wider base plate and interlock the bricks more tightly at the base.
How can I change the activity to suit younger or older children during the Draw a simple sketch and Build a basic prototype steps?
For preschoolers (3–5), use larger Duplo pieces, have them do a very simple sketch and one quick prototype, while older kids (8+) should make more detailed sketches, choose specialized pieces, and create and test multiple prototypes.
What are ways to extend or personalize the project after the Write one short explanation step?
Enhance your creation by adding a small motor or extra moving parts, decorating to match a theme, writing a step-by-step instruction sheet using your sketch and test notes, and recording a short video to share on DIY.org.