underscores the importance and potential of deep energy retrofitting among other solutions in achieving climate mitigation goals. Deep energy retrofitting is one of the solutions for cutting down the carbon footprint of buildings. The report found out that buildings & the construction industry together accounted for 36% of global final energy use & 39% of energy-related emissions. It calls to action for a 30% improvement, by 2030, in energy-use intensity (i.e. energy use per square meter) of the building sector, as compared to the 2015 levels, to achieve the Paris agreement goals successfully. Though a growing number of countries have laid down policies to buildings energy performance improvements but a rapidly growing buildings sector, especially in developing countries, has offset those improvements. The Report states that the efficiency improvements, including building envelope measures, represent nearly 2400 EJ in cumulative energy offsets to 2060 – more than all the final energy consumed by the global buildings sector over the last 20 years. It asserts that an aggressive scaling up of deep building energy renovations of the existing global stock is one of the important steps ahead. It points out to refer to Global Alliance for Buildings and Construction (GABC) Global Roadmap for building sector towards sustainability. The GABC Global Roadmap sets up to 'accelerate the improvement of existing buildings’ performance''' towards energy-efficient, zero GHG emissions and resilient buildings well before the end of the century taking the following steps globally: Significant increase of renovation operations including energy efficiency. Upgrade of the level of energy efficiency of each operation, in line with long-term standards.'' USA An analysis for 50% dip in energy consumption & carbon emissions by the US by 2050 translates to comprehensive energy efficiency retrofits in more than half the existing buildings (Nadel 2016). The policy framework for retrofitting in USA is directed at state and local levels. These efforts are supported by the national government. Hundreds of such programs exist, right from the basic energy audits, provision of financial rebates, to comprehensive ones that aim to optimize the entire house. Carine et al. summarize the below-listed elements present mostly in the best programs: Retrofit consultancy for consumers. Marketing to boost the demand-supply in this industry. Training, certification of retrofit contractors. Provision of rebates, upfront discounts. Investment in R&D. Building-efficiency labelling. The Home Performance with Energy Star program is run by many bodies in the US, with the aid of