Timber is the term typically used for wood that is used in construction. Although all timber is wood, not all wood can be classed as timber, as it needs to meet certain standards in order to be used in the construction of windows, doors, and even buildings. In order to be used for house beams, panels, and other building purposes, the timber used must be durable, high quality, and have been properly prepared. In short, timber is a structural material, whereas wood is an umbrella term which covers all manner of materials that come from trees — not all of which are suitable for construction.