Double glazing in hard wood entrance doors

doors do not need to be double glazed but should be tougned glass

All external doors and windows should be double glazed. Yes dooor glass toughened too.

Building regulations regarding the glazing requirements for entrance doors vary depending on the specific jurisdiction and the type of building. However, in many regions, building regulations do not specifically dictate whether entrance doors need to be double glazed, regardless of whether they are made of hardwood or softwood.