If you're planning to build a raised playhouse, you may need to obtain planning permission depending on the size of the playhouse, its location, and the regulations in your area. It's always a good idea to check with your local planning department or building authority before starting any construction project to ensure that you are in compliance with all applicable laws and regulations. While small or temporary playhouses may not require permission, it's better to be safe and obtain the necessary permission to avoid any potential issues down the line.