Abstract
New recast of the EPBD requires that that Member States shall establish a long-term strategy facilitating the cost-effective transformation of existing buildings into nearly-zero energy buildings. Lack of fund and lack of awareness is often considered to be the main barrier for the renovation. Experiences with renovation grant scheme in Estonia showed that large scale renovation scheme is a challenge to the construction industry and increased demand creates new problems like labour shortage and increased construction costs. Current renovation rate of apartment buildings in Estonia is approximately 200 buildings (~1%) per year. Demand is higher but current renovation technologies makes it difficult to significantly increase the renovation rate. Achieving the deep renovation goals with current technologies would require expansion of the whole construction sector (designers, contactors, material industry), which is difficult to achieve. Therefore, innovation and new technologies are needed. The prefabrication would be one solution to allow automation of the renovation process and renovate the existing housing stock within a reasonable time period.
Highlights
New recast of the energy performance of buildings Directive [1] requires that that Member States shall establish a long-term strategy facilitating the costeffective transformation of existing buildings into nearly-zero energy buildings
Main share of the housing stock in Estonia was built during the industrial construction period 1970-1990
During the period 2015-2017, renovation grant scheme for apartment buildings was available in Estonia
Summary
New recast of the energy performance of buildings Directive [1] requires that that Member States shall establish a long-term strategy facilitating the costeffective transformation of existing buildings into nearly-zero energy buildings. An average annual renovation rate of 3 % would be needed to accomplish the energy efficiency ambitions. Less than 3% of the building stock in the European Union has an Energy Performance Certificate label A (nearly-zero energy building) [2]. To achieve the goal to transform the existing buildings into nearly- zero energy buildings, 97% of the building stock must be upgraded. Off-site industrialisation and use of prefabricated building elements for the renovation represents a solution to automate the renovation process and renovate the existing housing stock within a reasonable time period. The pilot renovation was conducted with the prefabricated modular panels
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