الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Buildings are the result of many social, economic and technical influences. To consider its footprint on ecology, it will be needed to think more environmental which in turn puts the society on the path of sustainability practices. According to the United Nations Environment Program (UNEP) Sustainable Building and Construction Initiative (SBCI) buildings stock represents 25 billion of square meters, 40 percent of this stock were built before 1960 and it accused with 50 percent of total natural resources depletion, 45 percent of total energy consumption and 16 percent of total water consumption), therefore 40 percent of waste production and 30 percent of greenhouse gas emission produced each year. Moreover, these buildings do not offer the comfort and the quality expected by their users to achieve the international goals in terms of sustainability. In the first part of this study, the renovation process will be explored its definition, types, concepts, methods and, available techniques. The second part will explore how environmental renovation process are beneficial economically and methods of evaluation. The third part represents a guide-lines or a frame-work for numerical application of costbenefit analysis of environmental renovation process in contemporary buildings based on previous studies. Finally the conclusion of this study. Renovation process defined as the addition of new technologies or features to older systems by improving or even replacing building elements such as building envelop, mechanical systems, transform interiors into sustainable spaces, and green landscaping. Types of environmental renovation process classified from several approaches, the energy-saving target is the most common one, the second approach to classify the renovation process regarding the extent of intervention in building systems, operations, and elements, furthermore, the renovation process can be classified in terms of investment as an economic process. The environmental renovation process reduces the amount of energy and water necessary for normal operations of the structure. There are many methods to assess the renovation process more sophisticated than calculating building-related costs associated with acquiring, operating, maintaining, and disposing of a building or building systems separately. Some of these methods are more professional and suitable for environmental renovation than others like cost-benefit analysis which talked in chapter four, to select the design that ensures which facility will provide the lowest overall cost meanwhile the other methods are useful for different decisions or actions. It’s necessary to upgrade the existing buildings with the optimum environmental elements and systems at the same time to be the most cost-beneficial alternatives. Such a process is expensive -yes- but on the long run, it saves a lot of money, energy, health and also doesn’t pose a threat against the environment. The renovation process has different levels to be applied through different methods, concepts, techniques, or even changing a schedule of certain operations which could save a little amount of energy. For achieving the most economically beneficial environmental renovation process, the building must be analyzed with holistic thinking like the multi-criteria method to determine which retrofit action does the building need whereas there never be an open budget for any building or project. Most of the barriers against the process of environmental renovation revolve around the economic aspects, however, the higher upfront costs of more energy-efficient equipment would be lower than low initial capital costs, without appropriately considering medium and longterm costs.