There are many different types of construction defects that can occur. Some defects, such as putting windows in improperly or failing to ensure roofs are installed correctly, can lead to toxic mold problems. This is because the defects allow moisture into areas of the home where they shouldn't be.
Sometimes, people who have a construction project completed realize that there are issues with it right away. Other times, there might be problems that don't become evident for a while. One time when issues might be pointed out is during a home inspection. When this happens, the seller might be liable for correcting the issues. That seller might opt to turn to the contractor who did the project to get things handled. In some instances, this might require a lawsuit.