If economical analysis is added to the energy performance (thermoeconomic analysis) this goal may be accessible. There for capital investment to improve thermal condition of a building is annualized and added to the operating cost including fuel or electric consumption. The function which has to be considered to minimized is the sum of these two costs. Now you are looking to a building from economic point of view.

Energy performance analysis is important because it give answer to various questions a builder and an occupant must know. It also gives an idea about the energy cost involved in running the building over it lifetime(comfortable indoor environment) if building by laws are followed and relative impact if by laws are not followed. Though there are other contextual factors ignored in energy performance analysis.

But as a researcher I think it must be mandatory for all new constructions. 

The answers before do not seem to address the question, which is on how to do it, and how to promote it. There is some effort in the EU to try to improve the methodologies and the way energy efficiency is financed and promoted. Without proper information, there are no investors for this technology. Knowing the long term benefits is not enough, as customers very often do not want to invest fro longer term returns, or the returns are not 'owned' (e.g. tenants of buildings do not benefit from investing, owners do not pay the bills of tenants). New financing methods, aggregating projects to reduce the cost of the investment, and the creation of specialised funds to take the upfront costs are necessary. There is also a need to review in countries the regulatory framework, as energy efficiency in buildings is sometimes hampered by legal barriers, some of them rather illogical and unnecessary. I attach an overview document on some issues. I also add an example of an innovative approach by a consortium of companies and institutes for retrofitting public buildings and there is some information on how to calculate the benefits. The document is in fact to raise awareness and promote it.

http://eu-smartcities.eu/sites/all/files/Guideline-%20Financing%20Models%20for%20smart%20cities-january.pdf

http://ec.europa.eu/energy/efficiency/buildings/doc/report_financing_ee_buildings_com_2013_225_en.pdf

http://eu-smartcities.eu/sites/all/files/Smart%20Reno%20Up-%202020%20v2014.pdf