These 11 x 15 Low Roof Castles are suitable for indoor venues where the roof height is an issue. The Sponge Bob, Princess, Hello Kitty and Party Fun and 8 x 11 Castle need a minimum ceiling height of 8 foot 6 inches. The Low Roof Peppa Pig needs a minimum roof height of 9 foot 9 inches. The Minnions, Toy Story, Pirate, Super Hero's and Thomas need a minimum Height of 10 foot. All these castles are also suitable for out door hire on grass only.