Room-sharing between siblings is a common and cherished setup in many Australian households. Whether it’s due to limited space, family values, or simply because the kids enjoy being together, a shared bedroom can be both joyful and challenging.
One of the biggest questions parents face in this setup is:
What is the ideal mattress size for kids sharing a room?
The good news is that with the right mix of comfort, safety, and smart design, you can create a sleep environment that works beautifully for everyone.
Single Mattresses: The Most Popular Choice
For most shared kids’ rooms, single mattresses are the go-to option. They provide enough room for one child to sleep comfortably while leaving valuable floor space for storage, play, or study areas.
The Eco Kids Single Mattress is designed to give growing children firm spinal support and natural comfort, without crowding the room. With strong edge support, breathable materials, and a compact profile, it’s ideal for bunk beds or side-by-side layouts.
King Single Mattresses: For More Wiggle Room
If your kids are older, taller, or simply like extra space to stretch out, king single mattresses are a fantastic choice. They’re both wider and longer than a standard single, offering more comfort and room to grow.
The Eco Kids King Single Mattress features the same natural, hypoallergenic materials and Chiro Flex ES spring system, ensuring exceptional support and durability in larger shared spaces.
Bunk Beds: A Space-Saving Favourite
Bunk beds remain a family favourite for small rooms. But safety and size are key considerations here.
Always choose a low-profile single mattress for the top bunk to ensure it stays safely below the guard rails.
The Eco Kids Bunk Mattress is specially designed for this — combining compact height with strong edge support, GECA-certified foam, and breathable bamboo fabrics for healthy, uninterrupted sleep.
Mattress Safety and Support Come First
No matter which size you choose, the essentials remain the same — safety, support, and durability.
All Eco Kids mattresses are built with:
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Chiro Flex ES springs that are 60% stronger than standard kids’ mattresses
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Natural cotton and bamboo lyocell fabrics for optimal airflow
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Sensitive Choice® approval for allergy-safe, chemical-free comfort
This means even in shared spaces (and with the occasional jumping session), your kids enjoy consistent support and cool, comfy sleep — all year round.
Extra Tips for Shared Kids’ Rooms
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Use under-bed drawers or trundles for toys and clothes.
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Add vertical shelving to maximise space.
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Keep colour schemes calm and consistent to make the room feel larger.
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Let each child personalise their area with a special cushion, toy, or poster.
The Bottom Line
Finding the ideal mattress size for kids sharing a room is all about balance.
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Single mattresses work beautifully for most setups.
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King singles are perfect for growing kids who need a little extra space.
Add in the Eco Kids Mattress — with its blend of support, breathability, and sustainability — and you’ve got a shared bedroom setup that works for both sleep and play.
Explore the full Eco Kids Mattress range and find the perfect fit for your family’s shared room design.
Frequently Asked Questions
What mattress size is best for two kids sharing a room?
For most shared bedrooms, single mattresses are ideal as they save space and provide ample comfort. If space allows, king singles give growing kids extra room to stretch and move.
Are bunk beds safe for young children?
Bunk beds are safe for kids aged six and older, provided the top bunk has a secure safety rail and uses a low-profile mattress like the Eco Kids Bunk Mattress.
What should I prioritise when buying mattresses for a shared room?
Look for spinal support, durability, and breathability. A mattress made from natural, hypoallergenic materials — like the Eco Kids Mattress — ensures safe and healthy sleep in shared spaces.
