A Step-by-Step Guide on How to Fix a Sagging Sofa

If the sagging has originated from the base of the sofa, placing a piece of plywood can sort the problem. Here’s how:

• Measure the length and width of the area where the cushion is to be placed.
• To ensure a proper fit, first measure the area where you plan to place the cushions, then cut the plywood to match the size of the space. Lay the cushions flat on the surface, and then position the plywood directly beneath them, ensuring it covers the entire area. The plywood should be large enough to support the cushions evenly without overhanging. This setup will provide added stability and prevent the cushions from shifting.
• Lay the plywood on the sofa frame so it lays flat and fits perfectly under the cushions. This added support will reduce additional drooping and bring support to the region.
• Placing plywood is also one of the simplest ways to ensure the sofa does not sink in. This fix is excellent, particularly for old sofas whose support base has been stretched out for several years.

If the seats of your sofas are sagging, then the foam needs to be revived. Replacing or adding foam can make a huge difference:

• Turn the cushion over and unzip the cushion covers. If they do not have zippers, remove a layer of fabric and make a gentle cut alongside the seam as gently as possible.
• Measure and cut foam insert to fit each cushion. You can also add polyester fiberfill for extra fluff.
• Put the foam into the cushion cover and ensure it fits snugly and tightly into the cover.
• Tuck the covers back up, sew and put the cushions back on the sofa.
• This is one of the best procedures for restoring your cushions to life and offering a much-needed boost in both comfort and appearance.

If you notice that the springs under your sofa are broken or stretched out, here’s what you can do:

• Flip the sofa upside down and remove the bottom cover, if there is one.
• Carefully remove the springs using pliers or a spring hook. Take this opportunity to inspect them. If the springs are bent or broken, they will need replacement.
• Install the new springs or securely reattach the existing ones if they are still in good condition.
• Replace the bottom cover once the springs are fixed and ensure they are correctly secured.

Replacing or reattaching springs can drastically improve the firmness of your sofa. This is particularly for old sofas whose spring may have relaxed and do not bounce back to their original position.

Sometimes, the sagging is because of the fabric in your sofa frame weakening. If you notice any loose fabric, grab an upholstery needle and heavy-duty thread:

• Sew right through the middle of the sagging areas and continue to stitch.
• Tighten the thread as you sew to make the fabric hold better to the desired smooth finish.
• Tie the end with another reliable knot to increase its security in case of pressure.

This step significantly enhances the sofa's appearance and provides a stronger, more stable feel.

For an easier idea, place cushion toppers over your sofa. These toppers are also special pads placed on top of the chair cushions to give extra comfort. These won’t address why the sagging exists, but they may be a quick way to make things better.