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    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

    Filter Reviews

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    Rating
    (3,453)
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    (186)
    (384)
    Rated 5 out of 5 stars
    5
    Studio Collection – Studio Tight Top Medium
    Jul 13, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    A dream to sleep on from night 1!

    Jul 13, 2025
    Soundless sleeper now, Milwaukee, WI
    We have been sleeping on this bed for 3 weeks. There has been no “adjustment time” needed with this mattress. I have slept soundly and have not felt or heard my partner move at all. My partner likes mattresses softer than I do but this mattress has been perfect for both of us.
    Rated 5 out of 5 stars
    5
    Flat Foundation
    Jul 13, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Sleep is a treasure!

    Jul 13, 2025
    Treasure Sleep Seeker, Henderson, Nevada
    The five inch foundation lays the fabulous foundation for my superior bed and sleeping experience.
    Rated 5 out of 5 stars
    5
    Lux Estate Collection – Lux Estate Pillow Top Firm
    Jul 13, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Incredible!!!

    Jul 13, 2025
    Happy husband, Battle lake, MN
    We haven’t replaced our mattress for 20+ years. We went from a queen size to a king size (by my wife’s insistence). She was 100% right! Our Lux Estate Collection pillow top in firm has been sooo comfortable right from day one. Seriously, we look forward to going to bed early and dread getting out in the morning. I am not one to write reviews but I had to since we are so happy we went with Stearns and Foster👍🏻👍🏻👍🏻
    Rated 5 out of 5 stars
    5
    Flat Foundation
    Jul 13, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Right decision!

    Jul 13, 2025
    Happy couple, Battle Lake, MN
    We have only had for a couple of weeks but we made the right decision for us. We really didn’t want to go with a platform bed so we opted for the flat foundation. They fit perfectly in our king size bed frame and so far it has been perfect for us!
    Rated 5 out of 5 stars
    5
    Lux Estate Collection – Lux Estate Pillow Top Firm
    Jul 12, 2025
    Source:
    Stearns & Foster

    Mattress

    Jul 12, 2025
    June Bug, HEBER CITY
    After the FIRST NIGHT on our new Stearns & Foster mattress we knew we made the correct purchase! Very comfortable , easy entry for both if us.
    Rated 5 out of 5 stars
    5
    Lux Estate Collection – Lux Estate Tight Top Medium
    Jul 11, 2025
    Source:
    Stearns & Foster
    Sweepstakes

    Excellent

    Jul 11, 2025
    Cooper, Evansville, Indiana
    This is my second Stearns and Foster mattress. I’ve had my first one for 15 years and I still think it’s comfortable. Hoping this one last just as long. So far so good. I’ve been sleeping great.


    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

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