When the quality of a lawn is no longer acceptable, a lawn renovation may be required. Renovations can include planting additional seed into a lawn, or adding new grass varieties to repair damage and increase the tolerance of the lawn to shade, wear and tear, or drought. Typically, a renovation isn't needed unless 20-50% of a lawn has become bare. To prevent lawn renovation, it is necessary to maintain good grass and lawn care. However, a renovation can be the lawn treatment needed to bring a high quality yard back to life.