Is entry to Rouen Cathedral free?

Yes. Entry to Notre-Dame de Rouen Cathedral for general visitors costs nothing. You can walk through the main nave, visit the side chapels, and see the tombs of notable historical people, all without buying a ticket.

Most open areas do not charge a fee. But if you want a guided visit that includes places not open to everyone, like the crypt or the upper towers, then there is a charge, and you need to book ahead. The cathedral is still used for worship. Because of that, access might be limited during Mass or on religious holidays. When those times are over, guests can move through the cathedral freely, including the areas associated with Claude Monet’s famous paintings.