Single and king single mattresses are two of the most practical choices for New Zealand homes. They are commonly used in kids’ rooms, teen bedrooms, guest rooms, flats and smaller spaces where a queen or double mattress may feel too large.
But choosing between a single and king single mattress is not always obvious. A single mattress can save space and suit younger children, while a king single mattress gives extra length and comfort for growing teens, taller sleepers and guest rooms.
This guide explains the difference between single and king single mattresses, where each size works best, and what to check before buying.
1. Single vs King Single Mattress: What Is the Difference?
Both single and king single mattresses are designed for one person. The main difference is that a king single mattress gives extra length and sleeping space, making it more comfortable for taller children, teenagers and adults.
A single mattress is usually the most space-saving option. It works well in smaller bedrooms, shared kids’ rooms, bunk beds and compact guest spaces. A king single mattress is better when you want more room to stretch out without moving up to a double or queen size.
Choose a single mattress if:
- You are furnishing a younger child’s bedroom
- The room is small or narrow
- You need a practical mattress for a bunk bed or trundle-style setup
- You want to save floor space for play, study or storage
- You are setting up a simple guest or spare room
Choose a king single mattress if:
- Your child or teen is growing quickly
- The sleeper is taller and needs extra length
- You want a more comfortable guest room option
- The room has enough space for a slightly larger mattress
- You want a longer-term mattress choice
You can compare options here: shop single mattresses and shop king single mattresses.
2. Best Mattress Size for Kids’ Rooms
For younger children, a single mattress is often the most practical option. It gives enough sleeping space while leaving more room for toys, storage, a study desk or open floor space.
In smaller NZ homes, this can make a big difference. A child’s bedroom often needs to do more than hold a bed. It may also need space for school bags, clothes, books, play areas and storage furniture.
A single mattress works well for kids because:
- It fits easily into most children’s bedrooms
- It leaves more floor space for play and storage
- It is easier to pair with compact bed frames
- It can work well in shared rooms
- It is usually easier to move or rearrange
If the room is very small, a single mattress can be the better choice because it keeps the layout flexible.
3. When Should You Upgrade to a King Single Mattress?
A king single mattress is a smart upgrade when a child starts outgrowing a standard single mattress. It gives more length and comfort without taking up as much space as a double mattress.
This makes it a popular choice for teenagers, taller children and families who want a mattress that can last through different growth stages.
A king single mattress is useful for:
- Growing kids who need more leg room
- Teenagers who want a more comfortable bed
- Taller single sleepers
- Guest rooms used by adults sometimes
- Small rooms where a double mattress is too wide
If you are buying for a teen bedroom, a king single mattress can be a good middle ground. It feels more spacious than a single mattress, but still leaves room for a desk, wardrobe or bedside table.
4. Single or King Single for Guest Rooms?
For guest rooms, the best choice depends on who usually stays over and how much space the room has.
A single mattress can work for occasional guests, children or compact spare rooms. A king single mattress is usually more comfortable if adults may use the room, because the extra length can make the bed feel less restrictive.
Choose single for a guest room if:
- The room is small
- Guests only stay occasionally
- The room doubles as an office or storage space
- You want a simple spare bed setup
Choose king single for a guest room if:
- Adults may sleep there
- You want guests to feel more comfortable
- The room is narrow but has enough length
- You want a more flexible long-term option
If the guest room is also used as a home office, a king single mattress can still work well if the layout is planned carefully.
5. Think About Room Layout Before Buying
Mattress size is not only about the bed. It affects how the entire room works. Before choosing between single and king single, measure the bedroom and think about the furniture you need around it.
A room may technically fit a larger mattress, but still feel crowded if there is not enough space for walking, opening drawers or using a desk.
Check these before choosing:
- Can you walk around the bed comfortably?
- Is there room for a bedside table?
- Can wardrobe or drawer doors open properly?
- Does the room need a study desk?
- Will the bed block windows, doors or power points?
For kids’ rooms, leaving open floor space can be more important than choosing the biggest mattress possible. For teens, the extra sleeping space of a king single may be worth it if the room still feels practical.
6. Support and Firmness Still Matter
Even for smaller mattress sizes, support and firmness are important. A mattress should not be chosen only because it fits the bed frame or room size.
For kids and teens, a supportive mattress can help provide everyday comfort as they grow. For guest rooms, a medium or medium-firm feel is usually a safe option because it can suit different sleepers.
General firmness guide:
- Soft to medium: May suit lighter sleepers or those who prefer more cushioning.
- Medium: A versatile option for kids, teens and guest rooms.
- Medium-firm: A practical choice for older teens, adults and guest spaces.
Also check the bed frame or base. A mattress needs even support underneath it to feel comfortable and perform well over time.
7. Single or King Single: Which One Should You Choose?
The best choice depends on the sleeper’s age, height, room size and how long you want the mattress to last.
Choose single if you want:
- The most space-saving option
- A practical mattress for younger kids
- A compact solution for small bedrooms
- A simple spare bed for occasional use
Choose king single if you want:
- More length and comfort
- A better fit for teens or taller sleepers
- A more comfortable guest room option
- A mattress that may last through growth stages
In most cases, single is best for space-saving and younger kids. King single is better for growing teens, taller sleepers and guest rooms where comfort matters more.
Final Thoughts
Single and king single mattresses are both useful choices for NZ homes. A single mattress is compact, practical and ideal for kids’ rooms or smaller spaces. A king single mattress gives extra room, making it better for teens, taller sleepers and more comfortable guest rooms.
Before buying, measure the room, think about the sleeper’s age and height, check the bed frame and choose a support level that suits everyday use.
Explore options here: shop single mattresses or shop king single mattresses.
Related Guides
- Mattress Buying Guide NZ: Sizes, Types and How to Choose
- Queen Mattress NZ: Sizes, Support and What to Look For
- King and Super King Mattress NZ: Do You Need the Extra Space?
- Shop Single Mattresses
- Shop King Single Mattresses
FAQs
Is a single mattress good for kids?
Yes, a single mattress is a practical choice for many kids’ rooms. It saves space, fits smaller bedrooms and leaves more room for play, storage or study furniture.
Is a king single mattress better for teenagers?
A king single mattress is often better for teenagers because it gives extra length and sleeping space without taking up as much room as a double mattress.
Should I choose single or king single for a guest room?
Choose single if the guest room is small or only used occasionally. Choose king single if adults may use the room or if you want guests to have more sleeping comfort.
Does a king single mattress take up much more room?
A king single mattress takes up more room than a single mattress, mainly because it gives extra sleeping space. It is still more compact than a double or queen mattress.
What firmness is best for a single or king single mattress?
Medium or medium-firm is usually a versatile choice for kids, teens and guest rooms. Younger or lighter sleepers may prefer a slightly softer feel.
