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Home » Science Experiments for Kids » Candy Experiments » Build a Candy House – STEM Challenge

Build a Candy House – STEM Challenge

Modified: Feb 17, 2025 · Published: Mar 13, 2014 by Emma Vanstone · This post may contain affiliate links · 5 Comments

My 6-year-old came out of school last week incredibly happy and excited as he had spent the afternoon building a candy house. As soon as we got home, he wrote me a shopping list of what we needed to do a similar activity at home. This would also be great for a Three Little Pigs experiment or Charlie and the Chocolate Factory themed science investigation.

We discussed what we wanted to achieve and decided to split our project into two stages, building on the knowledge he’d already gained from school.

If you like this activity, there are 60 more easy edible experiments in my book – Snackable Science

Sweets, fudge and icing for a how to build a candy house STEM Challenge

Candy House STEM Challenge

What are the best sweets for ‘bricks’?

We decided marshmallows were too soft and not the best shape, but fudge rectangles would be perfect.

What can you use to stick the candy together?

We decided the material used to stick the sweets together needed to be sticky and harden over time, so we thought we’d try very thick icing sugar and marshmallow fluff.

How can you test how strong the house is?

We didn’t want to waste too much fudge in our testing ( although it did all get eaten ), so we decided to build two small walls to test our sticky substance.

We discussed what we needed to keep constant and what needed to change.

Variables

  • Icing
  • Marshmallow fluff

Constants

  • The amount of fudge.
  • The amount of sticky substance
  • Time left to harden

We used the same number of fudge pieces for each wall and tried to use the same thickness of icing or marshmallow fluff roughly, but this wasn’t entirely accurate.

Both walls were left overnight to harden.

Wall of a candy house made using fudge pieces and icing sugar

How to test for stability/strength

  1. Pick up the wall and see if it stays intact.

2. Roll a marble to the wall –  try to roll at the same speed and in the same direction for each wall.

sections of a wall made from fudge and icing for a candy house STEM challenge

Candy House Results

Observations

The icing sugar hardened completely, while the marshmallow fluff stayed soft and sticky.

Marble Test

The icing sugar wall fell over.

The marshmallow fluff wall stayed upright, but possibly because it was so sticky, the marble stuck to it, losing some of its momentum.

The pick-up test

The icing sugar wall remained in one solid piece when picked up.

The marshmallow fluff wall fell to pieces.

How can we improve this test?

Neater application of the marshmallow fluff so the outside of the wall was less sticky.

Place both walls in the fridge overnight to encourage the marshmallow fluff to set.

Next steps

Build a complete house, finding a suitable material for roof tiles.

A candy house made from sweets and chocolate for a science project or STEM challenge

Suitable for Key Stage 1 Science

Brilliant for starting to learn investigative skills.

Candy House Investigation Worksheet

Extension tasks

Try to build a stable structure using building blocks or straws and plasticine.

Build a spaghetti and marshmallow structure.

Think about how to construct a strong roof.

Making a gingerbread house and testing that for strength is also a fun variation of this activity.

More edible science experiments

Try one of my other edible science activities, STEM Challenges and experiments.

  • Pancake Syrup Viscosity Experiment
  • Marshmallow Launcher STEM Challenge
  • Science Sparks Bake Off
  • 15 AMAZING Candy Experiments and Activities
Image of a house built from sweets for a STEM Challenge

Last Updated on February 17, 2025 by Emma Vanstone

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Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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