Skip to main content
a 9 inch flat foundationa 9 inch flat foundation
9 Inch Foundation
a 9 inch flat foundationa 9 inch flat foundation
9 Inch Foundation

    Flat Foundation

    Engineered to support your Stearns and Foster® mattress with a perfectly solid, flat surface.

    Profile
    $315.00
    Free Delivery — Arrives in 2-3 Weeks

    • Designed in the USA
      Crafted with care and to last

    • Designed in the USA
      Crafted with care and to last

    • Free Shipping
      Arrives via UPS Ground Delivery



    Fashion
    + Function

    The perfect mattress isn't complete without the perfect foundation. Our flat foundations are designed to take the place of a traditional box spring and can be placed directly on your existing bed frame.

    SF Lux Estate mattress on a foundation
    SF Lux Estate mattress on a foundation

    Fashion


    + Function

    The perfect mattress isn't complete without the perfect foundation. Our flat foundations are designed to take the place of a traditional box spring and can be placed directly on your existing bed frame.

    SF Mattress on a foundation

    CRAFTED TO

    Complement


    Constructed with the finest textiles, our Stearns & Foster® foundation is designed to enhance the look and feel of your mattress.


    Why You'll Love It

    SF Lux Hybrid mattress on a foundation



    Perfect Match

    Our solid surface foundation is crafted to provide years of stationary support. Designed and upholstered to complement our mattresses and your bedroom décor.

    Why You'll Love It

    SF Lux Hybrid Mattress on a foundation Mobile


    Perfect Match

    Our solid surface foundation is crafted to provide years of stationary support. Designed and upholstered to complement our mattresses and your bedroom décor.

    An image showing the difference in height between the 5 and 9 inch foundations


    Custom Comfort

    Our foundations are available in a 9” height that matches a traditional box spring and a lower 5” profile for a more modern look that will easily fit through more narrow stairways.



    Custom Comfort

    Our foundations are available in a 9” height that matches a traditional box spring and a lower 5” profile for a more modern look that will easily fit through more narrow stairways.

    SF_flatbase2.original
    SF mattress on a foundation

    Crafted


    For you

    Constructed with the finest textiles that enhance the look and feel of your mattress, our Stearns & Foster® Foundation is designed to complement your style.

    Looking to Upgrade Your Bed?

    Get a $200 instant gift when you purchase an Ease Base with your mattress. The Ease Base adds unlimited adjustable positions to help you sleep soundly at night and enhance your sleep sanctuary.

    $200 Instant Gift with an Ease Base

    Benefits:

    • Unlimited Head and Foot Positions
    • Wireless Remote Control
    • Zero Gravity Preset Position
    • Free Delivery and In-Home Set-Up

    Shop Now

    Looking to Upgrade Your Bed?

    Get a $200 instant gift when you purchase an Ease Base with your mattress. The Ease Base adds unlimited adjustable positions to help you sleep soundly at night and enhance your sleep sanctuary.

    $200 Instant Gift with an Ease Base

    Benefits:

    • Unlimited Head and Foot Positions
    • Wireless Remote Control
    • Zero Gravity Preset Position
    • Free Delivery and In-Home Set-Up

    Shop Now

    Product Specifications

    Size Availability:

    Twin: 74L" x 38W"

    Twin Long: 79L" x 38W"

    Full: 74L" x 53W"

    Queen: 79L" x 60W"

    King: 79L" x 38W" (each piece/ 2-piece foundation)

    CA King: 84L" x 36W" (each piece/ 2-piece foundation)

    Split Queen: 79L" x 30W" (each piece/ 2-piece foundation)

    Split King: 79L" x 38W" (each piece/ 2-piece foundation)

    Split CA King: 83L" x 36W" (each piece/ 2-piece foundation)

    Product Weight:

    High Profile 9"

    Twin: 31 lbs
    Twin Long: 35 lbs
    Full: 42 lbs
    Queen: 48 lbs
    King: 70 lbs (35 lbs each piece)
    CA King: 70 lbs (35 lbs each piece)
    Split Queen: 60 lbs (30 lbs each piece)
    Split King: 70 lbs (35 lbs each piece)
    Split CA King: 70 lbs (35 lbs each piece)

    Low Profile 5"

    Twin: 25 lbs
    Twin Long: 29 lbs
    Full: 38 lbs
    Queen: 46 lbs
    King: 58 lbs (29 lbs each piece)
    CA King: 58 lbs (29 lbs each piece)
    Split Queen: 58 lbs (29 lbs each piece)
    Split King: 58 lbs (29 lbs each piece)
    Split CA King: 56 lbs (28 lbs each piece)

    Warranty & Returns:

    Warranty: Your Stearns & Foster foundation is covered under a 10 year limited warranty

    Return Policy: This product cannot be returned and the 90-Night Trial does not apply.

    Care Instructions:

    For more information on how to properly clean and care for this product, please visit our Product Care page.

    Rated 4.768421052631579 out of 5 stars

    Read Our Reviews

    Rated 4.768421052631579 out of 5 stars
    95+ REVIEWS
    AVERAGE OF 4.8 STARS
    Activating this element will cause content on the page to be updated

    Filter Reviews

    Activating this element will cause content on the page to be updated
    Rating
    (3,405)
    (458)
    (245)
    (185)
    (383)
    Rated 5 out of 5 stars
    5
    EASE® Power Base
    Jun 9, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    The “Ease” Power Base has improved my sleep.

    Jun 9, 2025
    Arlene, California
    I am a back sleeper and let me tell you….the zero gravity position has changed my sleep for the better. I usually toss and turn at night, but the very first night sleeping in the zero gravity position I felt rested and refreshed. I love it so much that I purchased another one for my rental property. It is very quiet to and easy to operate. The only thing I didn’t like was that the base was too high. The first delivery team did not tell me that there was a height adjustment. When the second one was delivered they showed me how to make the legs shorter. I had to get help with that to adjust the first one. Now all is well.
    Rated 5 out of 5 stars
    5
    EASE® Power Base
    Jun 8, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Beautiful Sleep and Top Notch Material

    Jun 8, 2025
    Happy Granny, Grayson, Kentucky
    Awesome comfort! Why did I wait so long to buy an adjustable base? Love the ability to raise the head and feet for the ultimate comfort.
    Rated 5 out of 5 stars
    5
    Estate Collection – Estate Pillow Top Firm
    Jun 7, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Beautiful Sleep and Top Notch Material

    Jun 7, 2025
    Content Granny, Grayson, Kentucky
    Stearns and Foster is the best mattress we have ever owned. Wouldn't have any other! We have experienced the best sleep of our lives.
    Rated 5 out of 5 stars
    5
    Reserve Collection – Reserve Pillow Top Firm
    Jun 2, 2025
    Source:
    Stearns & Foster

    The best mattress ever

    Jun 2, 2025
    David, PONTE VEDRA BEACH FL
    We have tried all of the name brands over the years with ongoing sleep and back issues with support and quality. We finally purchased a Sterns & Foster, Reserve Collection King. This has been by far been the best mattress we have ever slept on. I have back issues and, the first night, I had a very good and restful sleep, the first in many many years. This mattress literally changed my life with great quality sleep. The quality is outstanding!
    Rated 5 out of 5 stars
    5
    Estate Collection – Estate Tight Top Firm
    Jun 2, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Best quality ever

    Jun 2, 2025
    Greg Brown, Thousand Oaks
    It’s by far the most comfortable mattress we have ever owned
    Rated 5 out of 5 stars
    5
    Lux Estate Collection – Lux Estate Pillow Top Firm
    May 27, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Changed my life

    May 27, 2025
    JC, Mooresville
    I'm a 48 year old female. Before I got this mattress my whole body hurt most days. I literally had no pain after the first 3-5 days. Have had the mattress about a month and feel 5 years younger. I think the pillow top is very helpful. I didn't expect that this queen mattress would be so thick and it is extremely heavy.
    Load More Reviews


    BUILD THE BED OF YOUR DREAMS

    SF Reserve mattress on a flat foundation in a styled room

    Discover the handmade details and finest materials that make our mattresses truly exceptional.

    Shop Mattresses

    Lux Estate Mattress in a styled room raised on a base

    Upgrade to custom comfort with our Ease® Power Base—for a seamless sleep experience.

    Shop Power Bases

    Talk to a Sleep Expert

    Email us or call (844) 483-4172

    Feel it for yourself

    0 stores near you See List
    Close
    Improve Your Shopping Experience

    You’re using an unsupported web browser.
    A list of the most popular browsers can be found below. Just click on an icon to visit the download page.

    Close
    Your Software is Out of Date

    Your phone or tablet is using software unsupported by our website. To improve your shopping experience, please update your device to the latest version of iOS or Android OS.