In France, 20,000 people recently joined forces to renovate a castle together.
Here in Sweden, too, there are people who have taken on similar mammoth projects.
But renovating a castle is a full-time job that requires a lot of planning and patience, says Zander.
- The first thing to do is to make sure that the roof is tight.
If the roof is tight on an old house, it can stand for basically any length of time.
But what should you really think if you want to renovate a castle? Hear Anders Zander's best tips in the video above.