Easily Construct a DIY Cardboard Castle | Elmer's Build It Tools Tutorial

Transform cardboard crafts into magical moments by designing a custom cardboard castle. Looking for new and exciting ways to recycle your cardboard boxes? Bridge the gap between play time and medieval times with our step-by-step instructions to create your own castle, complete with a cardboard bridge! Form a fantasy world with a DIY cardboard castle fit for royalty, using the Elmer's Build It Tools Starter Set and Expansion Set.


Cardboard Castle Instructional


  • Cardboard Boxes

Elmer's Build It Tools Starter Set:

  • Holepunch & Screwdriver

  • Kid-Safe Cardboard Cutting Tool

  • Screws

Elmer's Build It Tools Expansion Set:

  • Hinges (optional)


Part I: Cut Out Your Cardboard Castle Design Template

  1. Gather your cardboard boxes, Holepunch & Screwdriver, Kid-Safe Cardboard Cutting Tool, Screws, and optional Hinges from the Expansion Set.

  2. Take 1 cardboard box and open both sides. Cut the cardboard BRIDGE design on 1 of the open side's flaps.

  3. Take 4 cardboard boxes and open 1 side of each. These will be your cardboard castle TOWERS. Then, take an additional closed cardboard box and cut out the TOP SIDES designs in the middle of your box for your TOWERS.

Part II: Connect Your Cardboard Castle Cutouts

  1. Attach your TOWER boxes together as pairs by their open sides using Screws to create a total of 2 TOWERS. (Tip: attach Screws on the top flap to increase their height.)

  2. Cut doors on your TOWERS for entry. If you have the Expansion Set, use the Hinges to reattach the doors.

  3. Attach the TOP SIDES designs to the top of your 2 TOWERS using a Screw for each side. Then, connect the cardboard BRIDGE to both sides using a Screw for each side as well.  

  4. Enjoy your new DIY cardboard castle like royalty! 

Elmer's Build It Tools turn your child's imagination into real-life cardboard cutout creations. Our kid-safe cardboard cutting and connecting supplies safely and easily create cardboard crafts for kids ages 6+. Ensure safety even when tools aren't in use with the additional security of the snap-on protective sleeve for our Kid-Safe Cardboard Cutting Tool.


*Adult supervision required.


Click here to download a PDF of all Elmer's Build It Project Instructions.