It's not always necessary to replace your roof before installing solar panels. If your roof is in good condition and has several years of life left, solar panels can be installed on it. However, if your roof is nearing the end of its lifespan or shows signs of damage, it's advisable to replace it before the solar installation to avoid the cost and hassle of removing and reinstalling panels later. A solar installer can help assess your roof's condition and advise on whether a roof replacement is necessary.