Repiping a whole house without cutting drywall is highly unlikely. Repiping typically involves replacing the existing plumbing pipes with new ones, which usually requires accessing the pipes inside the walls. Drywall cutting or removal is often necessary to reach the existing pipes, remove them, and install the new pipes properly.
In some cases, there are alternative methods to minimize the amount of drywall cutting, such as using access panels or making small openings in strategic locations. However, these methods may not completely eliminate the need for cutting drywall, especially in more extensive repiping projects.
If you're concerned about the aesthetic impact of cutting drywall, you can hire professionals who specialize in minimally invasive techniques to limit the amount of damage. They may use specific tools and methods to make smaller openings or use access points like crawl spaces or attics whenever possible. However, keep in mind that this approach might not be feasible in all situations, and the extent of drywall cutting required will depend on the layout of your house and the existing plumbing system.