Mattress Warranty Guide: What Is Covered and What Is Not
Mattress warranties run 10, 15, even 25 years on paper — and yet the most common consumer complaint is discovering, at the moment it matters, that the warranty covers almost nothing they thought it covered. This page breaks down what mattress warranties actually protect against, how the claims process works, which scenarios tend to get approved versus denied, and how to read the fine print before a purchase rather than after a sag appears.
Definition and scope
A mattress warranty is a manufacturer's written promise to repair or replace a mattress if specific, defined defects appear within a specified period. The operative word is defined. Unlike a return window — which the mattress trial periods and return policies page covers separately — a warranty is not a satisfaction guarantee. It is a defect guarantee, and the defects that qualify are verified explicitly in the warranty document.
Warranty lengths in the US mattress market typically fall into two structures:
- Non-prorated period — the manufacturer covers full repair or replacement costs, usually for the first 5 to 10 years.
- Prorated period — the consumer pays a percentage of replacement cost that increases each year, often making the benefit negligible after year 10 or 12.
A "25-year warranty" sold as a premium feature may actually mean 10 years non-prorated followed by 15 years prorated — a structure where year 20 coverage might require the consumer to pay 80% of the original purchase price. The Federal Trade Commission's guidance on warranties and the Magnuson-Moss Warranty Act establishes that warranty terms must be made available before purchase, but it does not set minimum coverage standards for mattresses specifically.
How it works
When a defect appears, the consumer typically initiates a claim by contacting the retailer or manufacturer directly, submitting photographs, and sometimes completing a third-party inspection request. Most manufacturers require:
That last point is where a disproportionate number of claims are denied. Nearly every major mattress warranty requires use of a compatible, structurally adequate foundation — and incompatible bases are the most frequently cited reason for voiding coverage. The mattress foundation and base compatibility page goes into detail on what qualifies. A box spring with broken slats, a platform bed with slat spacing greater than 3 inches, or a foundation not rated for the mattress weight will commonly void the warranty entirely.
The manufacturer — not the retailer — is usually the warrantor for mattress products. If the retailer closes (a non-trivial risk given independent bedding store closure rates), the warranty obligation follows the manufacturer.
Common scenarios
Scenario 1: Body impressions and sag. Most warranties cover visible indentations exceeding a threshold measured in inches — commonly 1.5 inches, though some premium brands set the threshold at 0.75 inches. An indentation of 1.2 inches on a warranty with a 1.5-inch threshold is not a covered defect. The measurement is taken without weight on the mattress, using a straight edge across the highest points.
Scenario 2: Cover and foam defects. Physical splitting of foam, broken coils in innerspring or hybrid mattresses, and structural failure of cover seams are typically covered. Heat-related foam softening without visible indentation is often not covered.
Scenario 3: Normal wear and comfort changes. A mattress that no longer feels as firm as it did at purchase, without measurable indentation, is almost universally excluded. Comfort preferences change; warranty language does not account for that. For readers wondering whether a mattress has simply passed its useful life, the when to replace your mattress page addresses lifespan expectations separately from warranty coverage.
Scenario 4: Stains and damage. A single stain — even a small one, even on a mattress used with a mattress protector — voids coverage under most manufacturer policies. This rule appears in virtually every warranty document reviewed by the Better Business Bureau in their mattress complaint pattern analysis.
Decision boundaries
The clearest way to understand what a mattress warranty covers is to contrast manufacturing defects with owner-condition failures:
| Covered | Not Covered |
|---|---|
| Sagging exceeding stated threshold (unweighted) | Softening without measurable indentation |
| Broken or protruding coils | Comfort dissatisfaction |
| Foam splitting or cracking | Stains or biological contamination |
| Cover stitching failure | Use on non-approved foundation |
| Manufacturer assembly defects | Physical damage (burns, cuts, liquid damage) |
Two additional factors frequently determine claim outcomes. First, where the mattress was purchased matters: some warranties are retailer-specific and do not transfer if the mattress is resold. Second, the foundation documentation requirement is not symbolic — manufacturers will request photographic evidence of the foundation used, and "I used a platform bed" without model documentation may not satisfy the requirement.
The mattress care and maintenance page covers rotation schedules and protective covers — both of which have direct bearing on keeping warranty conditions intact over time. A mattress that has been properly maintained from the start of ownership is simply easier to document as a warranty-eligible unit, because the paper trail of appropriate use already exists.
Mattress warranties are, at their core, a narrow promise about structural integrity. Treating them as anything broader tends to produce surprises. Reading the actual document — not the marketing summary — before purchase is the kind of friction that repays itself exactly once, usually about seven years in.