There’s nothing worse than a lumpy sofa cushion. Often people simply replace the furniture once the cushions go bad. But there is a way to repair sofa cushions and extend the life of your furniture. This idea is actually inexpensive and it will be easy for those with a little bit of DIY experience. First, begin my determining how many new sofa cushions you need. Measure the length width and depth of your cushions. Believe it or not, you can get sofa cushions now in just about any shape or size.