At the current time conservatories are normally exempt from building regulations in England and Wales if:

• They are situated at ground level, single storey and are permanently separated from the remainder of the property by a door
  
• The walls are glazed by a min of half their size
  
• The roof must be completely translucent or transparent with at least 75% of the area formed by glazing using polycarbonate sheets or similar translucent material
  
• Glazing must be toughened safety glass
  
• Any radiator in the conservatory has to be controllable and must have their own separate on/off controls
  
• The conservatory must not contain any drainage facilities for a washing machine, dishwasher etc
  
• The total floor area does not exceed 30m2