How to Fix a Sagging Mattress


Written by David Rubin

Our Editorial Process

Table of Contents

While manufacturers design mattresses to last for many years, even the highest quality models eventually soften and sag. If the sagging is minimal, you can try to counteract the effect. However, you may need to replace a mattress with more severe damage.

Noticing aches and pains upon waking, reduced edge support, or deep body impressions might suggest that your mattress needs attention. If the changes qualify as manufacturer defects, the company may offer to repair or replace the bed under its warranty policy. Otherwise, you can try other solutions to make the sagging less noticeable, like a mattress topper, pillows, or a more supportive foundation.

We’ll explain why mattresses sag and how you can make a sagging mattress more comfortable. We’ll also share information on prolonging the life of your mattress and when you should replace it.

What Causes a Mattress to Sag?

Mattresses sag for several reasons. We’ll highlight some of the most common contributing factors.

Normal Wear and Tear

On average, mattresses last between six and eight years. If your mattress is approaching the end of its life expectancy, sagging may be the result of normal wear and tear. Durability depends partially on the quality and type of materials. Mattresses with higher quality components usually outlast lower quality alternatives.

Defect or Damage

Defects in manufacturing or materials could contribute to sagging. In some cases, these flaws may not be apparent until you’ve slept on the mattress for some time. Warranty policies often cover the repair or replacement of a mattress with an eligible defect, so you may want to contact the manufacturer to see if your mattress qualifies.

A bed may also sustain damage through mishandling, abuse, or misuse. This can lead to structural issues that result in sagging.

Improper Support or Use

Mattresses need even support to bolster the surface, but the necessary level of support varies between models. Manufacturers typically specify proper mattress support on their product pages or within their warranty policies. Large, thick, or heavy mattresses often require a sturdier frame with six legs instead of four. If you use a slatted foundation, a model with less space between each slat is generally more supportive. You may also be able to reinforce your existing foundation with a bunkie board.

Improper use, like jumping on the bed or exceeding its weight limit, can also lead to premature sagging.

Ways to Repair a Sagging Mattress

While you can’t technically fix a sagging mattress, you can improve its performance to an extent. Small adjustments often extend the life of the bed. However, a new mattress may be in order if these techniques don’t work.

Assess the Situation

Evaluate your bed’s condition as objectively as possible. If your mattress is old or in bad condition, it may be time to replace it. If the sagging isn’t severe, you can try the following suggestions to make the bed more comfortable. However, consider replacing the mattress if you continue to experience pain or discomfort.

Check Your Warranty

A mattress that sags due to a defect may be eligible for repair or replacement under the terms of the warranty, potentially at no cost to you. Particularly if your mattress is relatively new, it may be worth reading the policy and contacting the manufacturer if you think there may be a qualifying defect.

Rotate or Flip the Mattress

When sagging is limited to one area of the mattress, rotating or flipping it may help. Unless the manufacturer states otherwise, we recommend rotating your mattress every three to six months so that it wears more evenly. Two-sided mattresses can also be flipped regularly to help prevent sagging. However, keep in mind that not all mattresses are flippable. If you’re unsure, check with the manufacturer.

Try a Mattress Topper

If replacing the mattress isn’t in your budget, a mattress topper can offer an affordable alternative. Mattress toppers come in a range of materials, including latex, down, and foam. A thick topper with plenty of cushioning may make sagging areas less noticeable and alleviate associated discomfort.

Use More Pillows

Sleepers can fill indentations in their bed with pillows. Pillows are typically most effective for counteracting sagging under the legs, hips, or back. Firmer pillows that hold their shape are usually most effective.

Replace the Foundation

Mattresses sometimes sag due to a lack of support. This is more likely if you have a frame with fewer than six legs or a foundation with slats.

Manufacturers generally provide information on appropriate foundations for specific mattress models. Read the warranty, check the product page, or contact the manufacturer to ensure your foundation is suitable for your mattress. If it is not, consider replacing it with a more supportive option.

Is It Time to Replace Your Mattress?

Most mattresses last between six and eight years, though longevity varies depending on the mattress type and material quality.

Signs a mattress needs replacement include:

  • You regularly wake up with body aches or muscle soreness
  • The sagging areas are visible
  • There is visible damage, such as cracking
  • There is excessive noise, such as squeaking
  • The mattress is six to eight years old or older

David Rubin

Director of Product Testing

Find your perfect mattress

We’ve tested hundreds of mattresses to help you sleep better. All it takes is 5 questions.

What position do you sleep in?

Side icon


selected icon
Back icon


selected icon
Stomach icon


selected icon

Do you experience any pain while sleeping?

Back and/or side pain icon

Back and/or side pain

selected icon
Neck and/or shoulder pain icon

Neck and/or shoulder pain

selected icon
Little to no pain icon

Little to no pain

selected icon

Do you have any material preferences?

Innerspring icon


selected icon
Foam icon


selected icon
No preference/ Other icon

No preference/ Other

selected icon

Do you sleep hot?

Yes icon


selected icon
No icon


selected icon

Do you sleep with a partner?

Yes icon


selected icon
No icon


selected icon


Tips to Prolong the Lifespan of Your Mattress

Caring for your mattress properly can help prolong its lifespan and prevent sagging. Follow manufacturer guidelines to avoid damage and ensure your mattress lasts for years to come.

These tips often help:

  • Clean your mattress every six months or so
  • Rotate or flip your mattress
  • Purchase a mattress protector or encasement
  • Refrain from tough use, including jumping, eating, or allowing pets on the bed
  • Don’t exceed mattress weight limits
  • Use a proper base or foundation

About The Author

David Rubin

Certified Sleep Science Coach, Director of Product Testing

David is a Certified Sleep Science Coach with a lifelong passion for well-being and health optimization. His interest in sleep developed with the arrival of his son, when sleep suddenly became a precious commodity.

  • POSITION: Side Sleeper
  • TEMPERATURE: Hot Sleeper

Get Your Sleep Questions Answered Live on 4/30

Have questions about sleep? Get all your sleep-related questions answered in a Live Q&A on YouTube with renowned sleep expert Dr. Michael Breus at 5 p.m. PST/8 p.m. EST.