After time spent maintaining and avoiding future damage, replacing the roof often becomes worth the investment. Different homeowners have different needs or circumstances when to do this, though. Some reasons you might want to consider replacing your old roof:If your roof damage is so great that it’s in danger of caving in. You need to get a new one. It won’t be safe to stay home if it isn’t properly repaired.Potential homebuyers may be wary of purchasing a home with an old roof or one that has undergone significant repairs. Replacing your roof may also increase the house’s value, offsetting the costs of installing the new roof.Some roofing companies charge by square foot when doing a partial roof replacement. It will become cheaper to replace the entire thing at a certain point. A partial roof replacement is most commonly used when fixing an issue with one or two specific shingles. Other savings include preventing damage from leaks and other weather-related problems, increased energy efficiency, and a longer lifespan.