King Single Mattress for Kids in Sydney - Eco Kids King Single from $849

Why are so many Sydney parents choosing a king single mattress for their growing kids? A king single is wider and longer than a standard single - 107 cm × 203 cm vs 92 cm × 188 cm - giving kids more room to stretch, last longer through growth spurts, and still fit a standard kids bed frame. The Eco Kids Mattress in King Single (RRP from $849) is the most popular kids king single in our range - winner of Australia's Best Kids Mattress by BedBuyer 2024, 2025 and 2026. Free express next-business-day delivery across Sydney.

Why a king single mattress for your child?

More sleeping room — about 16 cm wider and 15 cm longer than a regular single, so kids can stretch out
Lasts longer through growth — fits kids and teens up to ~190 cm tall, vs ~175 cm for a single
Still fits a standard king single bed frame — IKEA, Forty Winks, Snooze, Boori, and most Aussie kids bed brands all offer king single frames
Future-proofs the room — many Sydney parents buy king single from age 6–8 so they don't have to upgrade again at 14
Good for sleepovers — two younger kids can share comfortably

Eco Kids King Single - your four model options

🏆 BedBuyer 2026 Winner

Eco Kids Mattress

From $749.00

The original — Australia's Best Kids Mattress 2024, 2025 & 2026. Natural bamboo cover, GECA-certified foam, 15-year warranty.

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🏆 Mum Central Gold

Eco Kids Bunk Mattress

From $649.00

Purpose-built 14.5 cm low-profile mattress for bunks and trundles. Bamboo lyocell cover, hybrid spring core, hand-crafted in Melbourne.

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🏆 Clean + Conscious

Eco Kids Deluxe Pillow Top

From $999.00

Plush 50 mm GECA-certified pillow top over the Chiro Flex ES spring system. 15-year warranty, 100% vegan, hand-crafted in Melbourne.

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🌿 Natural Latex

Eco Kids Nature Luxe

From $1,499.00

Premium model — 50 mm 100% natural latex pillow top, eco-INSTITUT certified. Australian Made under licence 6697. Allergy-friendly.

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👑 King Single

Eco Kids King Single

From $849.00

Most popular king single in our kids range — gives growing kids and teenagers room to stretch out. Browse all king single mattresses.

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Boori Kids Single Bed Pocket Spring Mattress

💰 Best Value

Boori Kids Single Pocket Spring

From $365.66

Budget-friendly pocket-spring single mattress for younger kids and guest rooms. Browse all single mattresses.

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King single pricing across the Eco Kids range

Eco Kids Mattress King Single — $849 (the most popular)
Eco Kids Bunk King Single — $699 (low-profile 14.5 cm, for bunks)
Eco Kids Deluxe Pillow Top King Single — $1,099 (plush pillow top)
Eco Kids Nature Luxe King Single — $1,699 (premium natural latex)

All king single Eco Kids mattresses come with a 150 Night Sleep Trial and 10- or 15-year warranty. Browse the full king single mattress collection for adult king singles too, or compare against our single mattress range.

Free next-day delivery to Sydney

Order any king single Eco Kids mattress before 2 pm and we'll despatch it the same day for free express next-business-day delivery across Greater Sydney — Western Sydney, South-West Sydney, North Shore, Inner West, Eastern Suburbs, the Hills District, and the Sutherland Shire all included. Wollongong and the Illawarra are also covered. Every mattress is delivered fully-made (never compressed in a box) — our drivers handle the manoeuvring into your kid's room. 24-hour Click & Collect from any of our three showrooms is also available.

Visit a Sydney showroom — try every king single in person

All three Best in Beds NSW showrooms are Officially Licensed Eco Kids Dealers with the full range — including king single sizes — on display:

Eco Kids Mattress Prospect — Western Sydney
Eco Kids Mattress Campbelltown — South-West Sydney
Eco Kids Mattress Warrawong — Wollongong / Illawarra

Local delivery pages

Need help choosing the right model? Call 1300 399 676 or browse the full Eco Kids collection.

🏆 2026 Award Winner

Australia's BEST KIDS MATTRESS — BedBuyer 2024, 2025 & 2026

🚚 FREE Next Day Delivery

Sydney & Wollongong — order before 2 pm on any Eco Kids mattress

✅ Officially Licensed Eco Kids Dealer

Buy online with confidence or visit us in-store to try them yourself

Frequently Asked Questions

What is the size of a king single mattress in Australia? +

An Australian king single mattress is 107 cm wide × 203 cm long. That's about 16 cm wider and 15 cm longer than a standard single (92 × 188 cm). It's the most popular size for growing kids and teenagers because it fits a standard kids bed frame but gives kids room to stretch as they grow.

Is a king single mattress good for kids? +

Yes — it's an excellent choice for kids from about age 6 onwards. The extra width and length means the mattress lasts through growth spurts (a king single fits sleepers up to about 190 cm tall) and the wider sleeping surface is more comfortable for active sleepers. Most Sydney parents who buy a king single Eco Kids mattress don't need to upgrade again until adulthood.

How much is a king single Eco Kids mattress? +

Prices for the Eco Kids range in king single size: Eco Kids Bunk Mattress $699 (low-profile, for bunks); Eco Kids Mattress $849 (the most popular original); Eco Kids Deluxe Pillow Top $1,099 (plush pillow top); Eco Kids Nature Luxe $1,699 (premium 100% natural latex). All come with a 150 Night Sleep Trial and 10- or 15-year warranty.

Does a king single mattress fit a standard kids bed? +

Yes — king single is a standard size in Australia, supported by all the major kids bed frame brands (IKEA, Forty Winks, Snooze, Boori, Mocka, and most local manufacturers). Just check your bed frame is labelled 'king single' (not 'single') before ordering.

Can I get next-day delivery on a king single Eco Kids mattress? +

Yes — free express next-business-day delivery is included on every Eco Kids king single mattress when you order before 2 pm. We deliver across Greater Sydney, the Hills District, the Sutherland Shire, Wollongong and the Illawarra. Every Eco Kids mattress is delivered fully-made — never compressed in a box — and our drivers are experienced with narrow doorways and stairs.

What's the difference between a king single and a long single? +

A long single (92 × 203 cm) is the same width as a standard single but the same length as a king single. A king single (107 × 203 cm) is wider AND longer. King single gives more sleeping room; long single is mostly useful for taller kids on narrow bed frames. The Eco Kids range comes in both — long single from $799 on the standard Eco Kids Mattress.