Vidhyalakshmi Chandrasekaran

Background. Renovation of existing buildings has become a crucial tool to keep the built environment functional, by which unnecessary waste of resources can be reduced. Although many assessment methods and indicators are set, with the booming “renovation wave”, a question that counters us is how influential and intact these are as a measuring tool. Several debates have emerged in the literature on the integration of different indicators and approaches to have a better way of accessing the buildings. Purpose. The aim of the study was, first, to have a set of integrated indicators for the renovation of residential buildings and, second, to develop an assessment methodology aimed at a comprehensive evaluation of the renovation process throughout its lifecycle stages. A requirement specification and an outline of the tool were developed based on the literature review and the survey. Design. The study has applied a qualitative multi-method research approach, including an online survey with experts, and case studies. The survey was part of renovation needs, barriers and evaluation methods and indicators comprising four sections addressed to experts about building renovation. The aim was, besides collecting general knowledge about the renovation in practice, to identify key indicators and areas where development or modification could have effect during the renovation. The developed methodology was applied in a case scenario of a multi-apartment building in Lithuania. Conclusions. This paper included the development of a combined methodology which applies to the renovation of the existing multi-apartment buildings with a checklist of indicators corresponding to environment, economic, and social aspects.

Background. The environmental performance of buildings has been a focus of interest over the years in the building sector. Numerous building environmental assessment tools (BEA) have evolved to follow the lead of sustainability by updating categories and criteria from a lifecycle perspective. Therefore, it is timely to review the existing methods that already integrated LCA in their processes. The purpose of this study unfolds in three ways: (1) to review the existing BEA methods and LCA studies in residential buildings, (2) to compare the most adopted BEA methods, and (3) to study the integration of LCA and sustainability aspects applied within each selected BEA method. Methods. Scopus and Web of Science databases were searched for articles published between August 2010 and August 2021 in English. To identify studies and to conduct this review, four keywords, namely “Building Assessment Tools,” “Residential Building,” “LCA,” and “Sustainability” (and their derivatives), were used. The articles were searched so that all four keywords or at least a derivative of each keyword would appear. Furthermore, the outcomes of the database search were categorized as LCA and BEA for the review. Moreover, the seven most adopted rating systems were selected for review and comparison based on (1) the scope of buildings assessed, (2) lifecycle phases assessed, (3) assessment criteria, and (4) the user of tools. Findings. Of the 42 articles that met the enclosure criteria, 20 articles covered the environmental impact and 22 articles covered LCA. The review reveals that most of the analyzed systems focus more on the operational stage than on the other stages. Each BEA method is diverse in terms of its users, criteria, and regions and creates a niche among assessment methods. Conclusions. The main conclusion of this study is that a great deal of work is required to achieve the goal of making the existing “environmental” building assessment tools more sustainable. At the same time, a focus on the better implementation of LCA functionalities at each stage and a complement by integrating socioeconomic‐based LCA models were also required.

In Europe, more than 75% of buildings are energy inefficient according to current energy standards. These buildings account for 40% of total energy consumption. Therefore, addressing the energy efficiency of existing buildings through various renovation measures remains of critical importance. In this study, two differently renovated multi-apartment buildings were selected to evaluate its environment impact using life cycle assessment. The buildings were built during the early 1980s, which did not meet the current energy efficiency standards. In recent times, these buildings were revised by Governmental agencies through the modernization process. The aim of the assessment is to study the environmental impacts associated with different renovation measures that has been carried out. This assessment covers the impact of new materials added, and the operational energy use. The study reveals that renovation stage accounts for 19% CO₂ emission. The renovated buildings with renewable measures have a significant impact over climate change than the conventional renovation measures. Moreover, the potential savings in thermal energy used for space heating and domestic hot water preparation are 25% and 40% after conventional and renewable measures renovation, respectively. It was concluded that the total climate change potential could be reduced from 12% and 48% by retrofitting combined with renewable energy measures.