I do not know the numbers for here. From the report, the goal is to reach about 50% of the 2010 emissions by 2030. However, developed countries will need to make a bigger effort as they are developing.

In terms of the retrofit of homes, I am from Switzerland. The Swiss Government gave subsidies for people to retrofit their homes. The scheme was efficient so homes are relatively well insulated. Insulation is also good for the climate and saves energy. Retrofitting has many benefits and the initiative has been successful in Switzerland.