Whether you need permission is a question what kind of property you want to rent out. If it is your house og condo that you own, you can normally rent out as you like. If it is an “andelsbolig” you need permission from the board. If you are a tennant youself, you definately also need permission. Could you elaborate on which business case you are looking into?
Thank you for your response. How long have you been hosting for?
Also, I've added a tag with Aharon's name to your comment. To tag someone, tap "@" and select the host's username from the dropdown menu. This way, they will receive a notification