I am so surprised this is not the case in all developed countries. Every house in the EU that is sold or rented, needs an energy label, ranging from G (>380 kWh

I am so surprised this is not the case in all developed countries. Every house in the EU that is sold or rented, needs an energy label, ranging from G (>380 kWh /m2/year) to A++++ (0 kWh/m2/year). If you sell your house, it needs to be rated by an independent and certified party. New houses need to have an energy label A+++ or A++++ ( eg energy usage of at most 50 kWh/ m2/per year, which in practice means all new houses come with good isolation, a heat pump and solar panels. Restrictions are also coming in 2030 that forbid renting out a house with a poor energy label, and subsidies are provided to home owners for measures that improve the energy label of your house.