Thus, when the investors reach out to the architects for consultation, they understand the value and lasting benefit of GB. Then architects will advise them with more details, specific evaluation criteria and including cost estimation for GB. However, up to now, the investors who actively build GB often come from projects with a foreign budget because they are obliged to do the environmental protection policy of large international corporations. It is still unpopular for domestic investors to actively consult to implement GB.

When building a GB in severe environments, the difficulty doubles. For example, green architecture must not only consider whether the material has met the green building requirements but also whether it can withstand the environment in the sea or heavy industrial factories. If the materials that meet LEED standards cannot be found or harsh environments, additional criteria are required such as investment in solar battery systems, rainwater reuse systems, or automatic drip landscape irrigation system. If materials that meet LEED standards can be found right away and within the project’s investment budget, GBs will ensure higher certification.

The strictest selection criterion is normally related to the covering. This cover significantly affects the energy efficiency of the building, including the percentage of every window, the insulation parameters of walls, glass, light windows on roofs or all the building materials of that building. For the interior of the building, the criteria include compliance with the content of toxic substances in paints, carpets, adhesives used in interior equipment, or content of recycled components. Typically, the design consultants will prefer to choose the external materials due to having more points which affect the energy consumption of the building.