The main reason is price. The cost of steel buildings are less per square foot than any other known form of construction, and can be erected quickly, offering its owners faster access to their new building. Since steel is 100% recyclable, steel buildings have become one of the greenest construction methods available on the market today. Steel buildings construction have also been able to reduce its environmental impact in a variety of ways: (1) Raw Materials; (2) Design; (3) Construction; (4) Maintenance; and, (5) Disposal. Other important factors are its strength, mobility, flexibility, functionality and portability.