King Split Box Springs & Foundations

The Serta Flat Mattress Foundation is a box spring alternative and provides the perfect support for your Serta mattress, adds 9” in height to your bed, and is designed to provide durability and long-lasting comfort. Pairing this bed base with your mattress will support it and extend its life while helping isolate the effect of your partner’s movements in bed.

Great quality and meeting all needs. Ra. Monterey, TN. Sun Aug 23 2026

We are a proud manufacturer of the finest quality box Springs, with the highest standards in durability, quality, comfort, & beauty. All of our products are made in the USA to ensure that you get only the best! This item is part of our Hollywood collection, it has the following features: this box spring is uniquely designed to give you the kind of undisturbed sleep nature intended. Wood foundation, Continental box meets federal standards 1632 and 1633 fire code.

I was desperate for a boxspring, Easy to put together, shipping in about a week, i was worried more so because i got an open box for a discount for a king bed but its good, i think i might buy from wayfair again in the future.. Carissa. Bethesda. Mon Aug 10 2026

This product is designed to provide excellent support under any mattress. It ships in a compact box and can be easily assembled in minutes — without any tools! Unlike traditional box springs, our foundation can be broken down quickly if you’re moving or need to maneuver around tight corners. A Casper Foundation ensures that mattresses, sleep as they should. Some older box springs or foundations don’t provide a solid surface, causing mattresses to sag from the support breaks. Our Casper Foundations slats are positioned a perfect four inches apart for optimal support. A strong and level foundation helps mattresses perform at their peak for a decade or more, no matter what kind of bed frame they sit on. Casper Foundations and mattresses are the perfect pair. We spent over a year developing the Casper Foundations, so its design has the same considerations as our mattresses.

Easy to put together. Very sturdy. There are screws heads in the bed frame in 3 places down the middle of the frame and the center piece of the foundation sits on the screw heads. So it doesn’t fit flat on the frame. Either the makers of the bed or the foundation need to accommodate this space for the screw heads. I coved the foundation with a fitted sheet since it only comes in one dark color.. Doug. Erie, MI. Wed Jun 24 2026

Welcome to the Alwyn Home! Here we offer you the best prices for the best quality. Come have a look at our latest Split Fully Assembled Box Spring for Mattress from our Alwyn Home collection. This design is handcrafted so that you forget back pains and discomfort forever. Lay down your favorite mattress on our box spring to enjoy the beautiful sleep you always wanted. The equally distant slats and wood frame do not let the frame loosen up and are strong enough to handle various kinds of duress. You don’t need to worry about a squeaky bed frame ever again. The excellent packaging and design of the box spring are pre-assembled, just the perfect fit for your bedroom. The product is lightweight even as a traditional box spring and lets you have these benefits in assorted sizes namely: Twin, Twin-XL, Full, Full XL, Queen, King, and California King. We have twin profiles of the product in 4” and 8” thicknesses crafted just for your needs.

Box spring works well in my daughter's room. We redid the entire decor and it was time for an upgrade and the price was a steal .. Karen. Belle Chasse, LA. Sun Jul 26 2026

Upgrade your sleep setup with this heavy-duty metal box spring designed for strong, stable mattress support. Featuring reinforced steel slats, noise-free construction, and a clean fabric cover, this 9-inch foundation offers lasting durability with easy assembly and reliable everyday comfort.

We have been very pleased the bed frame headboard. Anonymous. Sat Aug 29 2026

Upgrade your mattress support with this 0.3" Split Folding Bunkie Board, designed to create a stable foundation for platform beds, slatted bed frames, box springs, and upholstered beds with spaced slats. (Not recommended for open metal frames without slats.) Made with durable polypropylene (PP) panels wrapped in stitch-bonded gray nonwoven fabric, it delivers firm support to help reduce mattress sagging and maintain a more even sleeping surface. The slim 0.3" profile adds support without increasing bed height, offering a convenient alternative to traditional box springs. The foldable two-piece design with hook-and-loop fasteners allows for quick setup, easy storage, and effortless portability, making it a practical solution for everyday mattress support needs.

I am very happy with this Bunkie board. It was easy to set up, feels sturdy, and provided excellent support for my mattress right away. My bed feels much more stable, and I no longer notice any sagging or movement. It has made sleeping more comfortable, and I appreciate that it has a low-profile design without adding unnecessary height. The quality is better than I expected, especially for the price. I would definitely recommend this Bunkie board to anyone looking for extra mattress support.. Kelly Watt. Tue Jul 21 2026

Very strong and easy to assemble. Nativida. Conroe, TX. Fri May 08 2026

Discover the foundational piece your bedroom with our mattress foundation, a testament to understated elegance and robust support. Handcrafted with precision, the slats are arranged to cradle your mattress, ensuring stability that lasts through years of restful slumbers. The unique combination of Kara-Guard padding, in place of ordinary cardboard, offers a silent guardian against noise, so your peace is never disturbed. Whether you choose the stately 9” regular profile or the sleek 5” low profile, this box spring is a canvas for comfort in any bedroom. Opt for this crafted foundation and transform your bed into a bastion of serene sleep.

It’s a boxspring and certainly does what it does what it needs to! Happy to have easy delivery and set up. Now just waiting for the mattress.. Christine. Wales, WI. Thu Apr 23 2026

Discover the perfect foundation for your bedroom with our box spring, designed to combine elegance and durability. Handcrafted with care, the slats are strategically arranged to support your mattress, ensuring lasting stability for years of restful sleep. Featuring Kara-Guard padding, this box spring replaces ordinary cardboard, offering a quiet, noise-free experience that enhances your peace and tranquility. Choose this expertly crafted box spring and elevate your bed to a true sanctuary of serene sleep.

Very lightweight and easy to maneuver. Made the bed height and comfort level so much better.. Marsha. Midlothian, VA. Fri May 29 2026

This high bed base is constructed from a combination of metal frame and foam. It provides stability with its strong steel construction while its 6 legs provide support and stability. It can be used as a box spring without the addition of the legs.

Love it was well worth it very sturdy and comfortable keeps my bed in place will buy again and agin. Catina Rochelle. Indianapolis, IN. Thu Jul 03 2025

Bring consistency and comfort to your nightly routine and your deep, restful sleep when you add our two-inch box spring mattress foundation to your bed. Featuring a slat support system made from North American timber, it has three layers of multi-needle quilting in a white knit fabric with fire-safety stitching.

Exactly what I wanted and as described.. Helen. Roseville, CA. Wed Jan 28 2026

9inch All wood foundation

Ordered a King Boxspring and received half of the mattress only. Called Wayfair and their only solution after I have waited weeks for this is that I would need to return it and shop for another bed! The representative acknowledged that the listing was wrong and lead buyers to think they were getting the entire King Boxspring but said there was nothing she could do to help me based on their error. She said she could refund me and I can shop for another bed. Now I still have no Boxspring for my bed and have to sit with this in my living room until a delivery company can come pick it up if at all. Wayfair needs to fix their customer service because they messed up and have found a way to make their error my problem. If you have a King bed you better order 2 of these.. Patria. Elizabeth City, NC. Thu Nov 30 2023