TL;DR: A 15-year mattress warranty covers manufacturing defects — usually sagging beyond a stated depth (commonly 2.5cm to 4cm) and broken springs or seams. It does not cover comfort preference, normal softening, stains, or damage from an unsuitable bed frame. Most warranties are also prorated after the first few years, meaning you pay a rising share of any replacement.
The warranty number is one of the most effective things printed on a mattress tag. Fifteen years sounds like a promise that the mattress will be good for fifteen years.
It isn’t quite that. It’s a statement about manufacturing defects, with conditions.
None of that makes warranties worthless — a long warranty genuinely does signal manufacturer confidence in construction. But you should know what you’re actually holding before you let it decide a purchase.
What a mattress warranty does cover
Across most manufacturers, coverage centres on three things:
1. Sagging or body impressions beyond a stated depth. This is the big one, and the one you’re most likely to claim on. The manufacturer sets a threshold — commonly somewhere between 2.5cm and 4cm — and sagging must exceed it, measured on an unweighted mattress, before a claim is valid.
2. Broken or protruding springs. Coils that snap, shift out of position, or push through the cover.
3. Manufacturing faults in materials or construction. Seams splitting, handles tearing away, foam layers separating, zipper failures on the cover.
That’s the substance of it. Everything else is generally excluded.
What it doesn’t cover
This list is longer, and it’s where the misunderstandings live.
Comfort preference. If the mattress is simply too firm or too soft for you, that isn’t a defect. This is the single most common reason claims are rejected. It’s also the reason testing properly before you buy matters more than the warranty length.
Also read: How to Test a Mattress in a Showroom: The 10-Minute Method (link once published)
Normal softening. All mattresses soften over the first few months as foams and fabrics settle. This is expected behaviour, not a fault.
Sagging below the threshold. A 2cm dip on a mattress with a 3cm threshold feels significant to sleep on and is not claimable.
Stains and soiling. This is the exclusion that catches people. On most warranties, any visible stain voids the entire warranty, whether or not it relates to the defect you’re claiming. One spilled drink can end fifteen years of coverage. This is why a mattress protector is not an accessory — it’s warranty insurance.
Damage from an unsuitable base. If the frame has slat gaps wider than the manufacturer specifies, or lacks adequate centre support for a queen or king, sagging is attributed to the base rather than the mattress. Claims get rejected on this regularly.
Normal wear, misuse, and removed law tags. Physical damage, use in a commercial setting when the warranty is for domestic use, or removing the manufacturer’s tag can all void coverage.
The part most buyers miss: prorated coverage
A 15-year warranty is rarely fifteen years of the same protection.
Most long warranties are structured in two phases:
- A non-prorated period, often the first 5 to 10 years, during which a valid claim is repaired or replaced at no cost to you.
- A prorated period afterwards, during which you pay a percentage of the replacement cost that rises each year.
So a claim in year twelve of a 15-year warranty might have you covering a substantial share of the replacement. That’s still a benefit, but it’s a very different thing from what “15-year warranty” implies on a showroom tag.
Always ask: “How many of those years are non-prorated?” That number is more meaningful than the headline one.
Costs the warranty usually doesn’t include
Even on a successful claim, you may be responsible for:
- Transport or collection of the old mattress
- Delivery of the replacement
- Inspection fees, in some cases
Ask about these upfront rather than discovering them mid-claim.
What voids a mattress warranty in Singapore
Worth keeping as a checklist:
- Any stain — the most common cause
- Using an unsupportive bed frame — wide slats, missing centre support
- Removing the law tag
- Physical damage from moving, folding or bending the mattress
- Not rotating it, where the manufacturer specifies rotation
- Buying secondhand — warranties are almost never transferable to a second owner
- No proof of purchase — keep the receipt for the full period
How to protect your warranty from day one
Use a waterproof mattress protector immediately. Not eventually — from the first night. In Singapore’s humidity, a breathable waterproof protector also handles perspiration, which is a slower but real source of staining.
Check your bed frame against the manufacturer’s specification. If they state a maximum slat gap, measure yours. If you have a queen or king, confirm there’s a proper centre support leg reaching the floor.
Also read: Wooden vs Upholstered Bed Frame Singapore: Which Lasts Longer? (link once published)
Rotate it as instructed. Usually head-to-foot every three to six months. Most modern mattresses are one-sided and should not be flipped — check before you do.
Keep the receipt and the warranty card together, digitally as well as physically.
Photograph the mattress when new. Rarely mentioned, genuinely useful if you ever need to demonstrate condition.
How to actually file a claim
If you think you have a valid defect:
- Measure the sag correctly — on an empty mattress, with no bedding, using a straight edge across the surface and measuring the deepest point. Guessing won’t survive an inspection.
- Photograph it with the straight edge and a measuring tape visible.
- Gather your receipt and warranty documentation.
- Contact the retailer first, not the manufacturer, unless you’re told otherwise. The retailer usually coordinates the claim.
- Be prepared for an inspection — either photographic or in person.
Should warranty length drive your purchase?
Use it as a signal, not a guarantee.
A manufacturer offering fifteen years is expressing confidence in construction, and that confidence usually correlates with high-density foam and a good spring system. That correlation is genuinely useful information.
But a 15-year warranty with a 4cm sag threshold and full proration after year five is weaker than a 10-year warranty with a 2.5cm threshold and eight non-prorated years. Compare the terms, not the headline.
The three numbers to ask for every time: total years, non-prorated years, and sag threshold in centimetres.
Also read: Luxury vs Premium Mattress Singapore: What Justifies the Price? (link once published)
Ask us the three numbers
At Catnap Lair we carry mattresses from Dozi, MaxCoil, Lady Americana, Four Star, Viro, Perfecta, Sleepynight and Dreamster, and warranty terms differ between them. Our showroom team can give you the total years, non-prorated period and sag threshold for any model you’re considering — before you buy, not after.
Browse the mattress collection, or visit the showroom at 33 Ubi Avenue 3, Vertex, #01-16. If you’d like the terms in advance, get in touch.
Frequently Asked Questions
Does a 15-year mattress warranty mean the mattress lasts 15 years?
No. It covers manufacturing defects for that period, usually with prorated coverage in the later years. It signals manufacturer confidence in construction, but it isn’t a guarantee of comfort or lifespan.
Does a stain void a mattress warranty?
On most warranties, yes — any visible stain can void the entire warranty regardless of the defect being claimed. Using a waterproof mattress protector from day one is the simplest way to avoid this.
How much sagging is covered by a mattress warranty?
Manufacturers set a threshold, commonly between 2.5cm and 4cm, measured on an unweighted mattress. Sagging below that threshold is not claimable even if you can feel it.
Can the wrong bed frame void my mattress warranty?
Yes. Slat gaps wider than the manufacturer specifies, or missing centre support on queen and king sizes, are common grounds for rejecting a claim.
Is a mattress warranty transferable if I sell the mattress?
Almost never. Warranties are typically valid only for the original purchaser with proof of purchase.
What should I ask before buying about warranty?
Three numbers: total warranty years, how many of those are non-prorated, and the sag threshold in centimetres. Also ask who pays transport and inspection costs on a claim.
