Building Regulations drawings and the required Structural Calculations usually cannot be compiled until we have received approval from Planning. Whereas Planning drawings focus on how the proposed alterations might change the look of the property and impact on its surroundings, Building Regulations drawings demonstrate how the building work will be done, the thermal efficiency, the suitability of products used and the structural integrity of the design. The Building Regulations drawings contain the detail needed to gain Building Control Approval. Without this, the construction cannot go ahead so this is very important, but is often overlooked. While not all building projects require Building Control Approval, many that are common to the home improvement projects do.