Build these two staircases using this plan to add that unique touch to your doll's house. By introducing one of these stair designs into your doll's house, it will open the entrance and allow room for some furniture. Your existing doll's house plan may need a little alteration to fit these designs. Scaled at 1/12th, they fit between 220mm (9\") floor-to-ceiling heights. The spiral case has a diameter size of 175mm (7\"), while the return case fits in a 127mm (5\") hall width, taking up 140mm (5 1/2\") front to back. Slight alteration may be required to fit your model. Please note this is a plan only not a kit. No building materials included.