A sagging or low-sitting couch is most often caused by loose springs that are no longer in the correct position. Unfortunately, most people don't realize there is a problem until several springs are out of position or the spring actually pokes through the fabric. In either case, fixing loose springs in a couch is not as difficult as it sounds and it will prolong the life of your couch.
Turn your couch over so you are able to work from the bottom. Unscrew and remove the legs of the couch, if possible. This will make it easier to remove the fabric from beneath the couch.
Examine the fabric on the bottom of the couch to determine how it is attached. Most couches have staples or small nails that hold the fabric while others are attached with loops and small ties.
Pull any staples or nails with a flat-head screwdriver or pair of pliers. Work around the bottom of the couch, removing the fabric from all but the back edge of the couch. Leaving one side attached makes it easier to reattach the fabric after the job is complete. Flip the fabric over the couch so it is out of your way, exposing the inside of the couch.
Find the loose spring or springs and determine the problem. Most often, the spring is just too loose or popped out of its fitting entirely. Ensure there aren't any larger problems such as broken springs, boards or fittings. These problems may warrant a trip to a furniture reupholstery business.
Twist or bend the loose springs back toward the fitting. Use pliers to avoid hurting your hands. Slide the end of the spring back into the middle of the fitting.
Hammer the nails or tighten the screws holding the fitting in place. When someone sits down hard on the couch or if one side of the couch is used more often than the other, the springs and fittings will gradually work loose.
Check the other fittings along the front and back side of the couch and tighten any loose ones.
Pull the fabric taut against the front edge of the couch bottom and use a staple gun to secure it in place. Work along each side and staple the fabric in place.
Align and replace the legs of the couch. Turn the couch over and return it to its original position.
Things You Will Need