Replace Couch Cushion Foam – Easy DIY Guide
Got a couch that’s lost its bounce? A sagging cushion can make any living room feel tired. The good news is you don’t need to buy a whole new sofa. Swapping out the foam is cheap, fast, and gives your furniture a fresh feel. In this guide we’ll walk you through everything you need, from picking the right foam to stitching the cover back together.
Gather the right tools and foam
First, grab a few basics: a pair of sharp scissors or an electric knife, a marker, a ruler or measuring tape, a utility knife, and a stapler or upholstery tacks. If your couch has a zippered cover, you’ll need a zip pull or a small screwdriver to open it. For the foam itself, look for high‑density polyurethane foam rated 1.8‑2.0 lb/ft³ for everyday use. If you want extra softness, you can add a layer of memory foam on top, but keep the base firm so the cushion holds shape.
Step‑by‑step replacement
1. Remove the old cushion. Take the cushion off the couch frame and set it on a clean surface. If the cover is sewn, cut the stitching carefully so you don’t damage the fabric. For zippered covers, simply unzip and pull the fabric away.
2. Measure the old foam. Lay the worn foam flat and measure length, width, and thickness. Write the numbers down and add a half‑inch extra on each side – this gives a little wiggle room for the new piece.
3. Cut the new foam. Unroll the foam sheet and mark the dimensions with a marker. Use a straight edge and a utility knife to slice through in one smooth motion. If you’re using two layers (foam + memory foam), cut each layer to the same size.
4. Test the fit. Place the new foam inside the cover or on the frame. It should sit snugly without bunching. If it’s too tight, trim a millimeter off the edges; if it’s loose, add a thin strip of foam around the perimeter.
5. Re‑cover the cushion. Slip the fabric back over the foam. If it’s a zippered cover, zip it up. For sewn covers, line up the edges and staple or tack the fabric to the underside of the cushion. Make sure the stitches are tight so the fabric won’t shift when you sit down.
6. Put the cushion back. Place the refreshed cushion onto the couch frame. Sit down, bounce a little, and check that the feel is even across the whole surface. If it still feels uneven, you may need to add a small wedge of foam underneath the low spot.
That’s it – you’ve given your sofa a brand‑new life without spending a fortune. A good foam replacement can last five years or more, especially if you rotate cushions regularly. Keep a spare piece of foam on hand for future touch‑ups, and your couch will stay comfy for guests and family alike.
Feeling confident? Grab your tools, head to the nearest hardware store, and start the swap. Your living room will thank you with extra comfort and a fresh look.
