This is so that you have as much information about the property as possible to enable you to make an informed decision to proceed with your purchase.  For instance, you wouldn’t want to find out that there was a mine shaft in your garden! The local search will reveal details about the planning permission that affects the property, the environmental search will reveal whether there has been any contamination in the area as well as details on flooding and the water and drainage search will disclose the location of any water mains running through the property, important if you are looking to extend your property post purchase.