Many houses are now made with steel frames put together with rivets and bolts. Walls and roofs can be made of boards that combine fibre with cement. These boards are thin, light in weight to transport, easy to put on the frame, and much cheaper than bricks or timber. A similar material can be made into roof tiles.
Houses come in many different shapes and sizes. They may be as small as just one room, or they may have hundreds of rooms. They also are made many different shapes, and may have just one level or several different levels. A house is sometimes joined to other houses at the sides to make a “terrace” or “row house” (a connected row of houses).
Houses have a roof to keep off the rain and sun, and walls to keep out the wind and cold. They have window openings to let in light, and a floor. Houses of different countries look different to each other, because of different materials, climate, and styles.