– Steel prices, which fluctuates on economic activity, supply, and demand. Availability of a major supply leads to extreme lows in prices, while fluctuation occurs with a major exporter experiencing natural disasters. Moreover, builders need to consider the overall market price on a particular day to give estimates accurately. – Fuel prices are the next variable and come by because it involves shipping of steel to the builder and the complete steel building to your lot.  – Purchasing power is another variable that affects how much you purchase your metal building. A company with large volume purchases is better positioned to demand lower prices from large entities.