How to Build a Model Medieval Castle

Written by flora richards-gustafson | 13/05/2017
How to Build a Model Medieval Castle
Make a model castle out of plaster of Paris. (castle image by Mat Hayward from

One of the most studied topics about medieval times is castles and their architecture. Although the French made major contributions to medieval architecture, the English excelled in castle architecture until the 15th century, according to The Castle of Wales website. After the middle ages, the French, Germans, Scots and Baltic people led the way in building the fortified structures. It is common for a student to build a model medieval castle for a school project. For this project, you will need rubber moulds to cast your model and a sketch of how you want your medieval castle to look.

Slowly add plaster of Paris into ½ cup of water, a spoonful at a time, without mixing it. Let the plaster sink down to the bottom of the water until all the plaster is wet and the surface of the plaster in the water is moist and a little lumpy. Then mix the water and plaster together slowly to remove any lumps. Hirst Arts says the mixture should resemble pancake batter.

Pour the plaster into the rubber castle moulds, up to the top, with a plastic spoon. Tap the mould to remove the air bubbles from within the plaster mixture. Alternatively, according to Hirst Arts, you can pound the work surface.

After about six minutes, when the plaster is as thick as toothpaste, use the putty knife to scrape the excess plaster off the top of the mould. Make sure the tops of the plaster in the moulds are level.

Let the blocks harden for 25 minutes and remove them from the moulds. Repeat this process until you have as many blocks and medieval castle pieces you need.

Draw your medieval castle's floor plans on a piece of cardboard or an old cereal box. Start gluing the plaster bricks into the middle of the mould and work your way out to the edge. This is the foundation of your castle.

Stack and glue the plaster bricks according to the medieval castle plans you drew.

Allow the glue to dry and paint the castle with the latex or acrylic paint colours of your choice.


The rubber moulds are available at craft and hobby stores.

Tips and warnings

  • The rubber moulds are available at craft and hobby stores.

Things you need

  • Rubber castle moulds, including small brick moulds
  • Plaster of Paris
  • ½ cup water
  • Plastic spoon
  • Disposable cups
  • Metal putty knife
  • Timer
  • Cardboard
  • Tacky glue
  • Exterior house latex paint or acrylic paint

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