Building Regulations 2010 (as amended): Approved Documents provide practical guidance. Part A: Structure (loads, ground movement, disproportionate collapse). Part B: Fire Safety (means of warning/escape, fire spread, access for fire service) — B1 dwellings, B2 other buildings. Part C: Site Preparation/Resistance to Contaminants and Moisture. Part D: Toxic substances. Part E: Sound (walls STC 45, floors STC 45 + IIC 62 between dwellings). Part F: Ventilation (intermittent/continuous extract, background ventilation, whole-building). Part G: Sanitation/Hot Water/Water Efficiency (125 L/person/day). Part J: Combustion appliances. Part K: Protection from falling. Part L: Conservation of Fuel and Power (2021: U-values walls 0.18-0.26, roof 0.11-0.15, windows 1.2-1.4). Part M: Disability access (M4(1) visitable, M4(2) accessible, M4(3) wheelchair). Part O: Overheating (2022, new). Part S: EV Charging (2022, new). Building control: Local Authority or Approved Inspector.