At European scale, according to Euroconstruct 2015, the construction sector represents 960 billion euro per year, the share of renovation is 57% of the market and energy-efficient refurbishments are deemed to represent only 15 % of all refurbishments. Increasing the market share of such deep energy-efficient refurbishment2 is a hard-to-reach objective as the market is fragmented. Indeed, more than 90 % of companies in the construction sector have less than 10 employees. However, it is key to find appropriate approaches to the market and leverage both demand side and supply side, as there is a consensus that these deep refurbishments are an opportunity to improve energy efficiency by 50 to 80%, which may be lost for 30 or 40 years if consumers do not choose appropriate works. The concept of “one-stop-shop” (OSS) is a business or office where multiple services are provided so as to offer customers all they need in just "one stop". Local authorities may also use this term to describe a facility offered to residents.
This concept seems attractive in order to lead people to perform energy-efficient refurbishments, as it would be a way to bridge the complexities of such projects for households and to overcome the fragmentation of the refurbishment market. But such one-stop-shop services are currently lacking, or still in an emerging phase, in most parts of Europe