The building regulations drawings are needed for building control and contractor. These drawings help ensure that house extension, conversions, renovations and new build (domestic or commercial) are going to be safe, healthy and high-performing. Detailed regulations cover specific topics including: structural integrity, fire protection, accessibility, energy performance, acoustic performance, protection against falls, electrical and gas safety. They also lay standards for drains, ventilation, protection against the ingress of water and protection against contamination. The building regulations are defined by the English and Welsh Governments.