A Review on Conversion of Existing Building into Green Building

: Green building construction has resulted in a slew of inventive solutions to lower energy usage. The requirement to develop a unified dimensional model for resource-saving, and environmentally friendly is a problem for assessments of green renovation (GR) of existing structures. India has three mechanisms viz. LEED (Leadership in Energy and Environmental Design), IGBC (Indian Green Building Council) GRIHA (The Green Rating for Integrated Habitat Assessment) are in place to help its fast-rising urban population to achieve ecologically sustainable growth. An attempt has been made here to review the conversion of existing structures into green buildings to save natural resources. It will be beneficial for the people who renovate their buildings or want to change to the green building concept. Green building implementation has become a need to optimize the scarce resources and to eliminate the negative impact of early cost surcharges on the green building idea should be eliminated. This review paper aims to find the solutions for existing buildings to convert them into green buildings and how life cycle cost analysis is important for the building.

consequences. These include noise, dust, traffic congestion, water contamination, and garbage disposal during the construction phase. A significant amount of natural and human resources will be depleted.
Buildings continue to influence the environment even after they are done. Building blocks account for 40% of overall energy use, according to the World Business Council for Sustainable Development. Apart from energy use, buildings emit Greenhouse Gases (GHGs), which contribute to global warming. Building carbon emissions will reach 42. 4  to help the long-term growth of green buildings. WGBC now has over 100,000 structures registered, totaling over 1,000,000,000 square meters [2]. In 2014, India has 53 cities with populations of over one million people. Mumbai has an estimated population of 18 million people, Delhi has a population of 16 million, and Kolkata has a population of more than 14 million (IIHS 2012). With a population of 17.5 percent of the world's population and a city population of 372 million (greater than the whole population of the United States), India confronts enormous urbanization difficulties [3]. To overcome these types of challenges and build environment-free buildings.

LITERATURE REVIEW:
The revolution is about green construction, intending to profoundly alter the built environment by producing energy-conscious, healthy, and productive structures that limit or eliminate buildings' enormous influence on urban life and global surroundings [4]. It's worth noting that in the past, the phrases "green building" and "sustainable building" were used interchangeably. According to Robichaud and Anantatmula, green buildings have four pillars: reducing environmental impacts, promoting occupant health, providing a return on investment for developers and the local community, and considering the life cycle during the design and construction progress [1]. Due to its substantial contribution to greenhouse gas (GHG) emissions and accompanying worries about increased global warming and climate change, the construction industry has been the focus of efforts to induce a move towards greener modes of working and construction [5]. Green buildings, according to the World Green Building Council (WGBC), are designed to reduce negative impacts on the climate and natural environment while also creating positive effects through appropriate actions taken during the design, construction, and operation steps. Green buildings help to preserve valuable natural resources while also improving people's quality of life. In comparison to a conventional structure, the Indian Green Building Council (IGBC) defines a green building as one that consumes less water and energy, creates less waste, conserves the environment and resources, and looks after the health and well-being of its residents [7]. The techniques now available for selecting building materials are reviewed and addressed under the definition of "green building materials." At the working plan stage, when architects and engineers must choose from a variety of items on the market, a special focus is placed on material selection [10]. It's important to distinguish between researching technology and using it. It will assist us in establishing a starting point for implementing the green idea and sustainable awareness in both consciousness and methodology, as well as cultivating the demand for and interest in advanced green technologies across society. The green buildings can then enter a profitable market cycle [13]. This has prompted studies on the efficacy of green building initiatives, as well as comparisons of the aims, criteria, and processes employed by various certifications. According to studies, the geographic patterns of LEED-certified projects differ statistically substantially. However, there has been very little quantitative research on worldwide certification patterns and trends. Individual case studies exist, but a deeper look into the characteristics of these projects, how these characteristics are linked to levels of certification achievement or strategies implemented Patterns of attainment of criteria or credits, as well as other inquiries, may lead to a better understanding of certification markets, their implications, and how they might be made more successful [9]. The technique for comparing green building grading systems has been examined to have a better knowledge of the operations. Because there are significant disparities in green building grading schemes when it comes to sustainability indicators, several essential criteria have been defined and utilized as a baseline for comparison research. The location, water, energy, indoor environment quality, material, waste and pollution, and management are the most important criteria [7].

WHAT IS THE GREEN BUILDING MATERIAL:
It is currently no unambiguous and globally agreed definition of "green construction materials," although they are commonly referred to as "eco-friendly" or "environmental sustainability" materials. As a result of these uncertainties, some materials have been released on the market with a generic claim of "greenness," but no proof to back it up, or even with false claims. Several times, the green feature of materials has been simply associated with their being 'natural,' ignoring the fact that asbestos (a carcinogen once added to a variety of building materials but now banned due to its carcinogen impacts), radon (a radioactive gas possibly ejected by some stones in the building and harmful to lung cancer), or turpentine (a solvent gained by distillation of tree resins and harmful to human health) are all-natural [10]. So basically, green building materials, often known as eco-friendly building materials, are building materials that have a minimum environmental effect. They are made up of renewable rather than non-renewable materials. These must be natural and unaffected by temperature, humidity, or cold.

BUILDING:
In comparison to a regular structure, a green building consumes less energy, water, and natural resources, produces less waste, and is better for the people who live within. By managing solar radiation temperature, energy consumption, water management, waste management, and interior air quality, green buildings provide an appropriate atmosphere.

Waste Reduction
Not present Present

INDIAN GREEN BUILDING RATING SYSTEMS:
In comparison to a conventional structure, the Indian Green Building Council (IGBC) defines a green building as one that consumes less water and energy, creates less waste, conserves the environment and resources, and looks after the health and well-being of its occupants (IGBC, 2018). A green building saves energy and water, lowers waste and pollution, and conserves all other resources to protect the environment without jeopardizing all stakeholders' health, comfort, cost, safety, or satisfaction. to protect the environment without jeopardizing the health, comfort, cost, safety, or satisfaction of all stakeholders. Such structures try to use renewable energy sources to meet a large portion of their energy consumption. Furthermore, water harvesting in green buildings reduces water consumption. The "reduce, reuse, and recycle" philosophy applies to green buildings [7]. LEED-India is affiliated with the internationally recognized LEED program,