If a LEGO set is already in your collection, you can start a build in just a few taps. This lets you track build progress, bags, time spent, and share updates with the community.

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Step 1: Open the Quick Action Menu

From anywhere in the app, tap the red “+” button in the bottom-right corner.

Then select Build.

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Step 2: Start a Build

You’ll see the Start a Build screen.

From here, you can:

• Search for a set by name or set number, or
• Choose from sets already in your account

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Step 3: Choose Where the Set Lives

At the top, you’ll see two tabs:

Building

• Shows sets you are currently building
• If the set is already in progress, it will appear here

Backlog

• Shows sets you own but haven’t started yet
• These come from your collections (especially Backlog collections)

Tap Backlog to start a new build from a set you already own.

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Step 4: Select the Set

Tap the set you want to build.

This will immediately:

• Start the build
• Move the set into your Building state
• Enable bag tracking, build notes, and time tracking

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Step 5: Build and Track Progress

Once started, your build will:

• Appear in your feed
• Show current bag number
• Track total build time
• Allow you to post updates as you go

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What Happens When You Finish?

When you mark a build as complete:

• The set is marked Built
• It’s added to your completed stats
• If it came from a Backlog collection, it’s automatically removed from that backlog

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Quick Tips

• You can only have one active build per set
• Builds work best with sets already added to your collections
• Backlog collections are the fastest way to start builds

That’s it — you’re officially building 🧱