Skip to main content
a 9 inch flat foundation
9 Inch Foundation
a 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
    (3,444)
    (462)
    (246)
    (185)
    (384)
    Rated 5 out of 5 stars
    5
    Estate Bedding Bundle
    Jul 7, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Pillows, sheet set

    Jul 7, 2025
    Squirrel, Port Orchard
    Very luxurious very nice, will more sets.
    Rated 5 out of 5 stars
    5
    Estate Collection – Estate Tight Top Firm
    Jul 5, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Firm and comfortable!!

    Jul 5, 2025
    bedbug, San Diego
    I’ve been sleeping on the Stearns & Foster Estate Firm Tight Top mattress for a few weeks now, and it’s been a game changer. It’s the perfect balance: firm support underneath keeps my back aligned, but the top layer has a plush, comfortable feel that makes it easy to relax into sleep. (Side note: I tried the pillow top firm in store and i personally thought the pillow top was too squishy. This mattress without the pillow top is perfect for me because i like a firm feel.) As someone who usually sleeps hot, I was surprised by how breathable this mattress is. it really helps regulate temperature well and i don’t wake up sweaty. Overall, I’m extremely happy with this mattress!
    Rated 5 out of 5 stars
    5
    Lux Estate Collection – Lux Estate Pillow Top Firm
    Jul 4, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Firm Queen Exactly as advertised!

    Jul 4, 2025
    JBiron, Savannah
    Exceptional quality firm queen mattress. Arrived on time. Exactly as ordered. My previous mattress hit 13 years. Could kick myself that I did not get replacement sooner. Make your comfort & sleep quality a priority. Get one of these!
    Rated 5 out of 5 stars
    5
    Flat Foundation
    Jul 4, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Quality and comfortability

    Jul 4, 2025
    Proud Owner, Nashville Tennessee
    I was suffering from back pain with my previous mattress. My sister owned a Stearns and Foster, and it was the most comfortable mattress. I never wanted to leave the bedroom! I purchased a Stearns and Foster King size mattress,.and I.could.stay in bed all day, without any back pain.
    Rated 5 out of 5 stars
    5
    Estate Collection – Estate Tight Top Firm
    Jul 4, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Relieved my hip pain!

    Jul 4, 2025
    Goodbye, hip pain!, Gibsonville, NC
    I love this mattress. I am a side and stomach sleeper and was experiencing a lot of hip pain when sleeping on my previous mattress. I thought this might be too firm, but figured I'd give it a shot. Since there was a 90-day return. I don't plan on returning it! My hip pain is gone and I sleep throughout the night comfortably!
    Rated 5 out of 5 stars
    5
    EASE® Power Base
    Jul 3, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Great base

    Jul 3, 2025
    Happy sleeper , Huntsville AL
    It has the zero gravity and has been a game changer for watching tv and putting my feet up. Getting to raise the head is amazing. I love it
    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.