Can a tool effectively aid user experience (UX) and user interface (UI) designers, along with frontend developers, in implementing more energy efficient websites? The foundation for formulating the thesis questions and identifying the issue was laid through an exploration of related work. This study aims to present the development of a tool encompassing recommendations and practices from existing research, providing valuable support for designers and developers.  Several methods, namely six, were established to better define and concretise the problems. The idea phase continued exploring potential solution both through looking at similar solutions as well as doing workshops together with potential users. In this phase the guidelines, now named SCOPES - System Conscious of Potential Energy Saving, started taking shape. The prototype was designed to assist web designers and developers in reducing energy consumption during website development. The study and especially the test phase found that guidelines empowered web designers to create energy efficient web pages, and users accept lower energy pages when aware of their efficiency, given that essential functionalities are retained.  The results of this thesis, supported by a total of 16 methods and 64 users with various backgrounds, ethnicities, and genders, emphasize the importance of addressing the challenges, posed by our energy-demanding society, pointing to potential pathways for a more sustainable and efficient future.

In the field of commercial real estate investments, interest in sustainability is growing as environmental, social, and governance (ESG) criteria become increasingly central to investors. The sector, a significant source of global carbon emissions, faces demands to align with sustainable development goals. Despite this, there is a significant gap in understanding how sustainability should be integrated into both decision-making and investment processes from the perspective of investors in commercial properties. This study explores the decision-making processes and factors influencing sustainable investments in commercial properties, with a focus on how investors value sustainability aspects in their decisions. The study is specifically limited to commercial properties in Sweden, particularly office buildings. A qualitative research methodology was applied, involving semi-structured interviews with key stakeholders within the Swedish real estate market. The results indicate that while traditional factors like location and condition remain important, the importance of sustainability aspects such as energy efficiency and environmental certifications in investment decisions is increasing. These factors contribute to reduced operational costs and increased property value but also improve financing opportunities from banks that prioritize green investments. Additionally, sustainable properties tend to have lower vacancy rates, enhancing their investment value. However, the lack of standardized methods for measuring sustainability in real estate investments is a significant barrier, complicating comparisons and consistent valuation of sustainability performance over time and across properties.