Depending on the scale and complexity of your development, you may require building regulations drawings and approval in addition to structural engineering calculations. Structural engineering calculations involve the assessment of a structure's load-bearing capacity and strength, as well as its size and shape. They also include evaluations of a structure's ability to resist forces due to wind and earthquakes. Calculations involve calculating the appropriate materials and strength of components to be used in a given structure and analyzing the safety of a structure's design.