The height of all rooms for human habitation should not be less than 2.75 m measured from the surface of the floor to the lowest point of the ceiling, according to the National Building Code of India 2005. (bottom of the slab). The average height of rooms under a pitched roof must be no less than 2.75 m. However, this does not apply to bathrooms, storage rooms, and other inaccessible areas of your house. The recommended minimum room height for safety is 2.5 m. If your room is smaller than this it is recommended that hanging objects are no more than 1.5 m from the ground. Roofs should be high enough to allow adequate light and air circulation within the building. Roofs should also be low enough to allow access to all parts of the building. Generally, roofs should be between 7 and 12 meters above the ground. Tall buildings with tall roofs are easier to keep clean. The choice of roof material depends on several factors such as climate, cost, etc.