Building Control exists to ensure that buildings are designed and constructed in accordance with the Building Regulations and associated legislation, such as structural stability, fire resistance, weather resistance, thermal insulation etc. You will need drawings to communicate clearly how you will do this.
When you seek quotes from builders for your project they will need detailed construction drawings so they can produce a building estimate and then build.
Importantly just before starting your construction you will have to register with your Local Authority Building Control Department and pay their required fee so they can check your project complies with Building Regulations. You will have to supply detailed construction drawings, for example detailing the construction of wall and roof. As part of our Architectural Online Service we can add the required construction detailing including additional cross section details, legend of required materials etc, on your plans to satisfy your Building Control Officer. Some structural supports and foundation depth will have to be determined on site during construction. You can insure the building and therefore if some bad happens, you can claim by comp lawyers.