LEGO 40905 Building Instructions - Birthday Cupcake
Seasonal • 2026
Where can I find LEGO 40905 Birthday Cupcake instructions?
LEGO 40905 Birthday Cupcake is a 174-piece LEGO Seasonal set released on 1 January 2026. This page provides a step-by-step building instruction video, with the featured guide divided into 5 timestamped sections covering 3 detected bag stages and a total runtime of 1 minute and 51 seconds. The page also links to LEGO's official building instructions for this set.
Official LEGO building instructions
Open the official LEGO instruction page to select and download the available PDF manual books.
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LEGO 40905 set details
Set overview
LEGO 40905 Birthday Cupcake is a 174-piece model. Verified product details include a collectible minifigure. The finished model measures 3 in. (10 cm) high, 4 in. (11 cm) wide and 3 in. (8 cm) deep.
What does this instruction guide include?
The featured guide is split into 5 timestamped sections, including 3 detected bag stages and a direct jump to the parts list. The featured instruction video runs for 1 minute and 51 seconds. Among the detected bag chapters, Bag 21 is the longest section at 45 seconds. Use the chapter links below to return to a specific stage without searching through the full video.
Video chapters
Jump directly to a section of this instruction video without leaving this page.